bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Preparation of Nanocomposite Antibacterial Agent
Authors: Zheng Yang , Zhang Jian Fei
Published: June 2012

The chitosan/modified nano-TiO2 composited antibacterial was prepared by hydrothermal method in this paper. The effects of reaction time and temperature, different kinds of alkali concentration on the reaction function of chitosan and nano-TiO2 were studied. Anionic surfactants were used for surface modification of nano-TiO2 and the composite reaction conditions of chitosan/modified nano-TiO2 were studied preliminarily. The chitosan/modified nano-TiO2 composite antibacterial was characterized by Fourier transform infrared spectroscopy (FTIR). The results showed that: under the conditions of the hydrothermal reaction (2mol/L NaOH, 120°C, 8h), the hydrogen bonds were formed between nano-TiO2 modified by SDBS and the chitosan molecules The different reaction conditions of nano-TiO2 were characterized by X-ray diffraction (XRD). The results showed that: nano-TiO2 can be fairly good activated under the conditions of the hydrothermal reaction: 1mol/L NaOH, 120°C, 14h.
Study on Precursor Preparation of Co3O4 Nanometer Particle and its Thermal Decomposition
Authors: Cao Qin Cun , Xu Ya Juan
Published: June 2012

The precursor of Co3O4 nanometer particles is synthesized through settles under given conditions. The decomposition process of the precipitate is studies by TGA and XRD. The results indicate that the precipitate is amorphous. With the temperature increasing the precursor firstly loses its free water and structure water. Then the precursor decomposes into Co3O4 nanometer particles at 321°C and change into CoO nanometer particles at 920°C.As the firing temperature and time increasing, the crystal transformation tends perfectly.
Preparation and Properties of Nanocomposites Containing FGF-2, other Related Dressings and the Primary Animal Tests
Authors: Wu Te Hsing , Lin Hong Ru , Shen Lie Han
Published: June 2012

PU/ hydrogel composites or it containing fibroblast growth factor-2 (FGF-2) composites had been prepared by γ-ray radiation or room temperature(T) method in this paper. We utilized nanosized clay solution, thermosensitive N-isopropyl acrylamide (NIPAAm), Polyurethane (PU), and acrylic acid (AAc) as the starting materials to synthesize PU/hydrogel nanocomposite products. The dipping and weighing tests, Material Testing Machine (LLOYD) were employed to analyze the physical and mechanical properties differentially. In addition, the drug release and the wound closure in animal experiments were also finished by Enzyme-link immunosorbent assay( ELISA) reader and magnifier for five groups of treatment dressings. From the experimental results, we distinctly obtained that animal tests of the PU/hydrogel composite incorporating FGF-2 as a wound dressing was able to effectively interact with the wound in a suitable moist healing environment. From the results, we also gained that these composites make themselves more compatible with skin.
Hydrothermal Synthesis of 3-Dimensional Flower-Like Y2O3:Eu3+ Microstructures and the Luminescence Properties
Authors: Ruan Yang Yang , Liu Yong Song , Dong Wen Jun , Li Chao Rong
Published: June 2012

In this work, 3-dimensional flower-like Y2O3:Eu3+ microstructures were synthesized through a facile route using simple hydrothermal reaction and sequentially calcinations without templates or matrix. The flower-like micro-architectures are self-assembled by nanosheets with thickness of about 50 nm and diameter about 3-5 μm, which were verified by the field-emission electron microscopy (FESEM) and transmission electron microscope (TEM). The as-synthesized Y2O3:Eu3+ samples show a strong red emission due to 5D0-7F2 transition (612nm), suggesting potential applications in red phosphors.
Synthesis of Fluorinated Silica Nanoparticles and the Wetting Prevention Ability
Authors: Yang Fan , Tang Dong Yan , Guo Yu Di
Published: June 2012

Fluorinated silica nanoparticles (FSNs) were synthesized by the hydrolysis of tetraethyl orthosilicate and fluoroalkyl siloxane, and by the assistance of surfactant of cetyltriammonium bromide (CTAB) under basic condition. Through adjusting the synthesis conditions, the better particles distribution of fluorinated silica could be obtained. Then the FSNs were used to prepare liquid marble with water and the stability of the liquid marble was tested to investigate the wetting prevention ability of the fluorinated silica nanoparticles.
Preparation and Application of Microencapsulated Flame Retardant Containing Phosphorus-Silicon
Authors: Yang Yong , Fang Jia Long , Lin Miao
Published: June 2012

The silica sol containing epoxy groups was prepared with tetraethoxysilane and silane coupling agent GPTMS as precursors by sol-gel technique and was used to encapsulate the microencapsulated flame retardant to enhance its flame retarding efficiency and water fastness for textile material. The prepared silica sol and gel were characterized by nano particle size analyzer, FT-IR spectrum analysis, energy spectrum analysis and SEM. The experimental results were proved that silica gel containing epoxy group was assuredly deposited on the surface of microencapsulated flame retardant. The cotton fabric was finished by the modified flame retardant and the test results (including the test of flame spread properties of textiles in vertical direction and the fastness to washing) showed that it had better flame retarding efficiency and water fastness.
The Study on Tribological Properties of the Nanoparticles Additives in Lubricant
Authors: Li Xian Min , Song Zhen Yu , Ma Ya Qian
Published: June 2012

The nanoparticles additives have very excellent abrasion resistance. In this paper, we study the tribological properties of the nanoparticles additives, and discusses the preparation methods of the nanoparticles and concludes the special nature of the nanoparticles additives in the lubricant through several visible tests. This paper makes a detailed analysis of the friction characteristics of the nanoparticles additives.
Effect of Zinc Substitution on Microstructure and Antibacterial Properties of Cobalt Ferrite Nanopowders Synthesized by Sol-Gel Methods
Authors: Sanpo Noppakun , Wang James , Berndt Christopher C.
Published: June 2012

Zinc substituted cobalt ferrite nanopowders with the general formula Co(1-x)ZnxFe2O4(with x = 0, 0.3, 0.5, 0.7, and 1) were prepared via the sol-gel route using citric acid as a chelating agent. The influence of zinc concentration on the microstructure, crystal structure and antibacterial property of zinc substituted cobalt ferrite nanopowders has been systematically investigated. The microstructure and elemental composition were characterized using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX), respectively. Phase analysis of cobalt ferrite nanopowders was performed using X-ray diffractometry (XRD). The antibacterial properties of zinc substituted cobalt ferrite nanopowders were investigated. The results indicate that the substitution of zinc influences strongly the microstructure, crystal structure and antibacterial property of the cobalt ferrite nanopowders.
Fragrance and Flavor Microencapsulation Technology
Authors: Zhu Guang Yong , Xiao Zuo Bing , Zhou Ru Jun , Yi Feng Ping
Published: June 2012

Fragrance and flavor are valuable ingredients in toiletries, cosmetics and foods. They play a very important role in these products. However, fragrances and flavors are complex mixtures of comparatively volatile substances and labile components of which the sensory perception can be changed as a result of heating, oxidation, chemical interactions or volatilization. Microencapsulation technology is an effective method to minimize the harm of these problems. Encapsulation of fragrances or flavors has been attempted using various methods. In this paper, the chemical and engineering processes for encapsulation of fragrance and flavor are discussed. The different coating materials and their application are depicted.
DNA/AuNP Fluorescent Detecting Nano-Device
Authors: Zhang Cheng , Yang Jing , Xu Jin
Published: June 2012

A DNA/AuNP (gold nanoparticle) detecting nano-device has been constructed using DNA displacement (three-way branch migration).Here, DNA/AuNP conjugations and DNA circle are utilized as basic parts in nano-system, while sensitive fluorescent signals are applied as output results. Because of the accurate molecular recognition and effective strand displacements, this detecting system is able to yield correct results after receiving specific input DNA signals. In this work, the results are detected at three levels: PAGE gel bands, fluorescent signals and TEM images. Especially, in TEM images, positions of AuNPs are detected as an alternative approach to obtain output results. Combing these multiple detecting methods together, advantages of this DNA/AuNP system could be taken used entirely. It is believed that DNA/AuNPs conjugations nano-device will be applied widely in molecular detecting fields.
Synthesis of BaMoO4 Nanocrystallites Using Sol-Gel Process
Authors: Zhang Quan Zheng
Published: June 2012

BaMoO4 nanocrystallites were synthesized successfully using Sol-gel process with (NH4)6Mo7O24•4H2O, BaCl2•2H2O, citric acid and PEG400 as original materials. The result shows that well-crystallized BaMoO4 nanoparticles were formed at 600°C with size of ca.50nm. The synthesized BaMoO4 nanocrystallites were characterized by XRD and IR, and the optical property was studied as well.
Study on Stabilized of Poly(Vinyl Alcohol) Nanofibers Based Sandwich Structure Purification Material
Authors: Liu Rui Xue , Liu Tai Qi , Zhao Na
Published: June 2012

PVA nanofibers are generally required to be modified because of its poor stability in water. The water stability of PVA nanofibers was improved by heat treatment in this paper. The DSC test results showed that the crystallinity of heat-treated PVA nanofibers at 150°C for 10 min reached the maximum which increased by 12% compared with PVA nanofibers. From the SEM images it was observed that the heat-treated fibers didn’t dissolve in water but showed certain degree of agglutination and swelling. PVA nanofibers were taken as the inner layer of the sandwich structure purification material prepared with the hot pressing technology. The filtering experiments showed that the filtration properties were better when the area density of PVA nanofibers was 2.5 g/m2.
Photoluminescence Properties of β-SiC Nanoparticles by Electric-Pulses Discharge in Liquid-Phase Compound
Authors: Du Kai , Wei Rong Hui , Liu Feng Wei , Sun Shuai , Li Li Ben
Published: June 2012

β-SiC nanoparticles have been synthesized by electric pulses discharge (EPD) in Hexamethyl disilane. Dependence of photoluminescence (PL) from the samples with air-annealing are presented. Emission bands around 400 nm and 470 nm are observed at room temperature. The corresponding PL properties and possible mechanisms are discussed. The 400 nm peak may be result from the atom excess defect center at the surfaces of β-SiC nanocrystallites, while the 470 nm peak is believed to be related to the defects created in the interface boundary between β-SiC nanocrystallites and amorphous SiO2.
Heteroe-Pitaxial Growth and Optical Properties of SnO2 Nanowires on ZnS Nanobelts
Authors: Jiang Mang , Duan Jun Hong , Liu Zhiang
Published: June 2012

The authors present the results of hetero-epitaxial growth of ultrafine SnO2 nanowires on ZnS nanobelt substrates by a simple thermal evaporation method. ZnS/SnO2 hetero-nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDS), transmission electron microscopy (TEM) to obtain the morphology and structural information. Comparing with ZnS nanobelts and SnO2 nanowires respectively, the optical properties of ZnS/SnO2 hetero-nanostructures are studied by Raman scattering and photoluminescence (PL) spectroscopy at room temperature.
A New Type Battery Equalization Circuit of Electric Vehicle
Authors: Li Chun Peng , Xia Bi Zhong , Li Xiao Liang , Zheng Wei Wei
Published: June 2012

A new type of electric vehicle battery equalization circuit is described and analyzed in this paper. The circuit uses a two-way flyback converter and relay group to achieve energy transformation between the batteries and realize energy balance of electric vehicle battery pack, which could prevent battery over charging and over discharging. Compared to conventional equalizer, the equalizer is faster and more effective.
Synthesis and Electrochemical Properties of KMn8O16 Nanorods
Authors: Zheng Hao , Jiang Xue Ya , Wu Hui Min , Dan Mei Yu , Feng Chuan Qi , Wang Shi Quan
Published: June 2012

KMn8O16 nanorods were prepared by a rheological phase method using KMnO4 and Mn (CH3COO)2•4H2O as reactants. The samples were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the morphology of the samples was nanorods with a diameter of about 5~15 nm. The electrochemcial testing showed that the KMn8O16 nanorods annealed at 400 °C for 4 h exhibited good lithium storage properties, with a high reversible capability (143 mAh/g at current density of 50 mA/g) and stable lithium-ion insertion/de-insertion reversibility.
Portrait of China’s R&D Activities in Nano-Science and Nanotechnology in Bibliometric Study
Authors: Zhao Yi , Ma Nan
Published: June 2012

China has made great improvement in some critical scientific subject, like nanoscience and nanotechnology. This study explores the state-of-the-art developments of China in nanoscience and nanotechnology, as the previous study showed that China has become the second leading nation in terms of its share of “nano-prefixed” publications all over the world. Patent applications are also included in this study, as there are considerable efforts underway that aim to commercialise nanotechnology, and it is also an important aspect of R&D output. In particular, this study compares the rising pattern of nano-publication and nano-patents, to showcase the gap which lies between the knowledge base and technology base. Furthermore, this study investigates the research focus for both publications and patents in nanoscience and nanotechnology. The findings suggest that the strong presence of publications in MATERIALS SCIENCE, PHYSICAL CHEMISTRY and APPLIED PHYSICS are also in line with China’s overall research focus; while there are also many inventions focused on novel formulations of pharmaceutical products which have recently applied in Chinese Traditional Medicine. Finally, the cross-analysis of top organizations and Derwent Classification indicates that the collaboration links between organizations are relatively weak, though their technologies are highly concentrated in some similar areas. Collaborative research is a double edged-sword which may either mutually enhance the research base, or damage to the competitive advantage in commercialization.
Effects of Different Factors on Antibacterial Properties of Crosslinked Chitosan-Coated Ag-Loading Nano-SiO2 Composites
Authors: Zhang Li , Niu Mei , Dai Jin Ming , Wei Li Qiao , Liu Xu Guang , Xu Bing She
Published: June 2012

Chitosan (CTS) and Ag-loading nano-SiO2 (SLS) are excellent antibacterial materials. However, when used alone, these monocomponent antibacterial agents are sometimes far from meeting requirements in special conditions. In this study, crosslinked chitosan-coated Ag-loading nano-SiO2 composites (CCTS-SLS) were synthesized by adsorption crosslinking reaction. Then Escherichia coil (ATCC 8099) was taken as the experimental bacteria for antibacterial tests. The experimental results indicate that the mass ratio of SLS to chitosan had the greatest influences on the value of MIC (minimal inhibitory concentration) for CCTS-SLS composite. However, the heating temperature had a weak influence on the antibacterial performance of CCTS-SLS composite.
Preparation of Paclitaxel-Loaded Microspheres with Fe3O4 Nanoparticles and Study of their Target-Orientation and Sustained-Release Property
Authors: Cui Sheng , Lin Ben Lan , Shen Xiao Dong
Published: June 2012

Paclitaxel-loaded microspheres with magnetic Fe3O4 nanoparticles were synthesized with albumin as carrier. The morphology was characterized by high-resolution transmission electron microscopy (HRTEM). The drug-loading rate and entrapment rate of the microspheres were researched by ultraviolet and visible spectrophotometer. The inhibition action of taxol microspheres to growth of esophagus cancer Eca109 cell were examined by MTT method. The result shows that it is regular spherical. The mean size and size distribution of microspheres are 275.6nm and 144.3nm by Zetasizer3000. The drug-loading rate is 3.013% and the entrapment rate is 35.26%. It has excellent target-orientation and sustained-release property which can prevent the growth of Eca109 cell.
Effect of Cooling Rate on Microstructures and Mechanical Properties of X80 Pipeline Steel
Authors: Yu Qing Bo
Published: June 2012

The thermal simulation experiments of X80 pipeline steel were performed using Gleeble 1500 thermomechanical simulator. The controlled rolling and controlled cooling experiments were used to investigate the effect of cooling rate on the microstructures and mechanical properties of X80 pipeline steel. The results show that the cooling rate plays an important role in the ferrite grain size and the volume fraction of granular bainite. In order to obtain good comprehensive mechanical properties, it is necessary that the cooling rate should be 12~20°C/s.
State Analysis on Reactor Furnace Pipe Used over a Design Cycle
Authors: Ma Li Feng , Ding Xiao Fei , Zhang Jun , Mao Kai Tian , Gong Li Jing
Published: June 2012

. Reformer furnace is the typical high-temperature equipment in petrochemical installations, but furnace pipe is the heart. The creep, thermal fatigue, thermal oxidation, carburization, corrosion and other phenomena may occur in harsh high temperature environments during service of furnace pipe. These factors make the properties degrade and life time short during all times of service. It will have significant economic losses if the rupture facture accident occurs suddenly. Comprehensive state analysis and life evaluation of reformer pipe run over service period to understand microstructure and property of furnace pipe by a range of material analysis methods, so that this will have important reference value for designer, manufacturer and user.
Production of as-Cast High Strength Toughness Ductile Iron
Authors: Li Meng
Published: June 2012

The paper has mainly reviewed the production process of as-cast high toughness ductile iron, analysing the effects of chemical composition, desulphurization process, nodulizing process and the craft of inoculation on the production of as-cast high toughness ductile iron.
Influence of Tin on Properties and Corrosion Behavior of Q125 Grade Tube Used in Deep Well
Authors: Zhang Jun Sheng , Wu Hui Bin , Wang Li Dong , Liu Sheng , Liu Yue Ting , Tang Di
Published: June 2012

The influence of Sn on mechanical properties and CO2 corrosion resistance of oil tube was investigated by TEM, EBSD and electrochemical measurement. The results show that the addition of 0.05%Sn can improve the corrosion-resistance of tested steel, but decrease the elongation and impact energy. Sn affected the activity of tested steels, moved corrosion potential to negative potential and decreased corrosion current density. Consequently, the polarization resistance of electrode reaction increased and corrosion reaction was slowed down due to the effect of Sn. In addition, Sn increased the proportion of low boundary, which improved the corrosion resistance of steel, and accordingly decreased the proportion of large angle grain boundary, which contaminated the elongation and impact energy of steel. However, Sn had little influence on the microstructure, precipitates of steel. And thus the strength of steel did not change obviously.
The Effect of Nb on the Microstructures and Hardness of Quenching-Partitioning-Tempering Medium Carbon Steels
Authors: Zheng Hua , Wu Kai Ming , Hu Feng , Zeng Yang Zheng
Published: June 2012

Nb-free and Nb-bearing medium carbon steels treated by quenching-partitioning-tempering process were investigated. The microstructural observations and hardness were analyzed by optical microscope, transmission electron microscope, X-ray diffraction and hardness test. Results show that when quenched at 210oC and partitioned at 450oC ultra fine-grained microstructures of martensite, retained austenite and carbides are obtained. The Nb-bearing steel has finer martensite lath, more volume fraction of retained austenite and higher hardness compared with that of Nb-free steel. The addition of Nb is responsible for not only the precipitation strengthening but also the more volume fraction of retained austenite during quenching-partitioning-tempering process.
Piezoelectric, Dielectric and Pyroelectric Property in Morphotropic Phase Boundary MnO2 Doped Bi0.5(Na0.82K0.18)0.5TiO3/P(VDF-TrFE) 0-3 Composites
Authors: Fan Mao Yan , Zhang Yang Yang , Zhang Qing Feng , Zhang Guang Zu , Lu Lin
Published: June 2012

MnO2 doped Bi0.5(Na0.82K0.18)0.5TiO3/P(VDF-TrFE) 0-3 composites with high pyroelectric coefficient were prepared for different volume fractions of MnO2 doped Bi0.5(Na0.82K0.18)0.5TiO3 ceramic powder in P(VDF-TrFE) copolymer matrix. The dielectric constant, dielectric loss and the piezoelectric coefficient increased as MnO2 doped Bi0.5(Na0.82K0.18)0.5TiO3 ceramic volume fraction increased. The pyroelectric coefficient and figure of merit of Bi0.5(Na0.82K0.18)0.5TiO3/P(VDF-TrFE) with different MnO2 amount and 0.8mol% MnO2 doped Bi0.5(Na0.82K0.18)0.5TiO3/P(VDF-TrFE) as a function of ceramic volume fraction were studied respectively. The results indicated that 0.8mol% MnO2 doped Bi0.5(Na0.82K0.18)0.5TiO3/P(VDF-TrFE) in 20vol% ceramic volume fraction show the best pyroelectric properties with pyroelectric coefficient p= 7.8×10-5C/m2K and figure of merit FD=11.4×10-6Pa-0.5.
Iron Ore Sintering Process Based on Alternative Gaseous Fuels from Steelworks
Authors: de Castro José Adilson , Guilherme Vagner Silva , França Alexandre Boscaro , Sazaki Yasushi
Published: June 2012

This paper deals with the numerical simulation of the new technology of gaseous fuel utilization on the sintering process of iron ore. The proposed methodology is to partially replace the solid fuel(coke breeze) by steelworks gases. A multiphase mathematical model based on transport equations of momentum, energy and chemical species coupled with chemical reaction rates and phase transformations is proposed to analyze the inner process parameters. A base case representing the actual industrial operation of a large sintering machine is used with thermocouples inserted into the sintering bed to record the inner bed temperatures and compare with model predictions in order to obtain model validation and parameters adjustment. Good agreement of the temperature pattern was obtained for the base case and thus, the model was used to predict four cases of fuel gas utilization: a) 2% of the wind boxes inflow from N01-N15 wind boxes of natural gas(NG), b) same condition with coke oven gas(COG), c) same condition with blast furnace gas(BFG) and d) mixture of 50% COG and 50% BFG. The model predictions indicated that for all cases, except only BFG, the sintering zone is enlarged and the solid fuel consumption is decreased about 8kg/t of sinter product. In order to maximize the steelworks gas utilization it is recommended the use of mixture of COG and BFG with optimum inner temperature distribution
Effect of Nitrogen on the Mechanical Properties of Heat-Resisting Steel
Authors: Liu Xiao , Wang Long Mei
Published: June 2012

In this paper, the effect of N addition on mechanical properties of 21Cr-11Ni austenitic heat-resisting stainless steel was investigated. Scanning electron microscopy was used to study the fracture surfaces in the steels. N in 21Cr–11Ni heat-resisting steel can play a role of stabling austenite and ensuring the structure and mechanical properties in high temperatures. Fracture is changed from cleavage to ductile fracture to 21Cr–11Ni heat-resisting steel, and the strength of test steel are improved at room temperature by adding N, the tensile strength is increased by 8.33%. And the creep rupture strength is improved. The fracture time of the steel containing 0.2% N is 3.2 times higher than the steel containing 0.14% N at 1144K.
The Impact on Pellets Quality by Semi-Self-Fluxing Iron Powder
Authors: Wang Li Li , Ke Hai Bin , Zhang Hong Yan
Published: June 2012

Semi-self-fluxing iron powder is identified by self-fluxing nature or alkalinity ,they contain part of CaO and MgO. To make full use of resource and improve pellets quality,do a series of tests. The results show that semi-self-fluxing iron powder can improve pellets metallurgical properties. Put forward the appropriate mixing proportion and roasting temperature.
Stability of Reversed Austenite in 9Ni Steel
Authors: Wu Hui Bin , Li Lei , Zhang Kun , Tang Di
Published: June 2012

The samples of 9Ni steel were treated by Quenching + Tempering (QT) and Quenching + larmellarizing + Tempering (QLT). The morphology, thermal stability and mechanical stability of the reversed austenite in 9Ni steel were studied by TEM, XRD, EBSD, subzero treatment, three-point bending, uniaxial tension and uniaxial compression. It turns out that blocky reversed austenite occurs in QT-treated steel, while blocky and filmy reversed austenite occurs in QLT-treated steel, additionally, the filmy reversed austenite distributes in the lath boundaries. Subzero treatment shows that certain amount of reversed austenite in QLT-treated samples transforms after dipping into liquefied nitrogen, but it retains a higher level of more stable austenite in QLT-treated sample than that in QT-treated sample. Both tension and compression facilitate the transformation of reversed austenite into martensite, and the retained austenite mainly locates within grains.
The Microstructure and Characteristic of 410L Stainless Honeycombs Fabricated by Extruding and Sintering
Authors: Zhou Yun , Du Yu Jie , Zuo Xiao Qing
Published: June 2012

Pure 410L powder is used to mix with an additive to prepare a powder mixed paste. 410L honeycombs are fabricated by extruding the powder mixed paste, then dried and sintered. With sintering temperature increasing from 1120°C to1150°C, the density of sintered honeycombs increasing, powder particles bind together and become grains. The structure parameters and properties of sintered honeycombs were obtained by measuring and calculating. Results show that wall thickness 0.13~0.18mm, cell number (1/in2) 350~385, clear cross section (%) 73~80, specific surface Sv(sq m/cu dm）2.68~2.85； specific heat capacity Cp(J/g.K) 0.50~0.56, heat conductivity κ(W/m.K) 11.2~12.5. SEM/EDS analysis shows that the structure of sintered honeycombs consists of matrix phase α-Fe(Cr) and small particles which are complex compounds of silicon, iron and inclusion elements distributed in matrix. Chromium oxide is formed on surface of sintered honeycombs.
Effect of Tempering Temperature on the Microstructure and Mechanical Properties of a 0.1C Steel with High Strength and Low Yield Ratio
Authors: Zhou Wen Hao , Guo Hui , Shang Cheng Jia
Published: June 2012

The influence of tempering temperature on the microstructure and mechanical properties of low carbon low alloy steel was investigated. The results show that tempering temperature has considerable influence on both yield strength and tensile strength. With the increase in tempering temperature, the yield strength increases first and then decreases after it reaches the highest point at 600°C with a strength of 843MPa, while the tensile strength decreases fastly from 550°C to 650°C and keeps stable after increasing drastically at 720°C. The yield ratio is about 0.60 except at 600°C and 650°C with a high yield ratio of 0.90, while the total elongation has little change. It is concluded that the major change of mechanical properties after tempering has a connection with the decomposition of M/A(martensite/austenite) islands, the recovery of dislocations and the precipitation of alloy elements.
Cleanliness Evaluation for 55SiMnMo Steels Produced by EAF→LF→VD→Billet Casting Process
Authors: Zhu Jing Tao , Li Jing She , Cheng Ai Min , Sun Li Yuan , Ding Xiao Ming
Published: June 2012

Cleanliness of steels is one of the major factors influencing the final product quality. This paper introduced industrial practice of producing clean steel by EAF-LF-VD-Billet casting process. The cleanliness of 55SiMnMo steel during the whole producing process was analyzed by methods of sampling systematically and comprehensive analysis including total oxygen and nitrogen content analysis, optical microscope observation and SEM+EDS. The factors affecting the steel cleanliness were discussed. Some measures to improve steel cleanliness were proposed.
Effects of Normalizing Annealing on the Recrystallization Texture of 4.2wt.%Si Non-Oriented Electrical Steel Thin Sheets
Authors: Liu Jinlong , Sha Yu Hui , Yao Yong Chuang , Zhang Fang , Zuo Liang
Published: June 2012

The 4.2wt.%Si non-oriented electrical steel thin sheets with the thickness of 0.30mm were produced by the conventional procedure including hot rolling, cold rolling and annealing. The recrystallization texture was analyzed with emphasis on the effect of normalizing annealing. The results show that the  fiber with peak at {111} is weaker and η ﬁber is stronger in the sheets with normalizing annealing than those without normalizing annealing, either under the cold rolled reduction of 77% or 86%. Effects of normalizing annealing on the recrystallization texture can be explained in terms of the characteristic of the shear bands formed during cold rolling process.
Effect of Boron Mud on Melting Temperature of CaO-Based Steelmaking Slag
Authors: Wang Hong Ming , Li Gui Rong , Zhang Ting Wang , Yang Li Li , Zhu Xiang , Zhao Yu Tao
Published: June 2012

For the elimination of the fluorine pollution of steelmaking slag, boron mud is employed as fluxing agent for CaO-based fluorine-free slag. The effect of boron mud on the melting properties of slag is investigated. Hemisphere method is used to determine the melting temperature of samples. The results indicate that when the content of boron mud is lower than 7%, the melting temperature can be decreased by boron mud. With the content of boron mud increasing higher than 7%, the melting temperature is increased with increase of boron mud content. The basicity and the content of F2O3 have remarkable effect on the melting temperature of boron mud containing slag. When the basicity is in scope of 2.0-5.0, the melting temperature is in the range of 1350-1450°C correspondingly. The melting temperature of boron mud containing slag can be decreased significantly with increase of F2O3 content.
The Tempering on Microstructure and the Yield-to-Tensile Ratio of High Performance Steels
Authors: Wang Xue Min , Zhao Hui
Published: June 2012

The effects of tempering temperature on the microstructure and mechanical properties of 600MPa grade low carbon bainitic steel were investigated. The cause for the microstructure evolution has been investigated and the best tempering process was chosen to decrease the yield ratio of the steel. The influence of tempering process on the yield-to-tensile ratio of steels has been investigated by the aid of optical microscopy, SEM and XRD. The results show that after the TMCP processing the microstructure of steels mainly consist of lath martensite and bainite. The bainite and martensite have been refined markedly after the relaxation processing, therefore the properties of steels has been improved evidently. In order to decrease the yield-to-tensile ratio the steels underwent high temperature tempering. It has been found that during the tempering with the tempering temperature increased the yield-to-tensile ratio of steels decreased. The XRD and EBSD results show tempering temperature has considerable influence on the yield strength, but the influence on the tensile strength is not considerable. With the increase in tempering temperature, the low temperature toughness of steel can be improved considerably. The yield ratio of the steel was reduced after tempering at 650 °C and higher temperatures due to reversed austenitic phase transformation.
Comparisons of Laser Cut and Water Cut for Silicon Steel Plate
Authors: Liu Geng Wu
Published: June 2012

Silicon steel plate is main material of motor and transformer , and can be produced by Laser cut or water cut . The advantage and disadvantage of laser cut and water cut was analyzed from the economy and technology point of view . It will provide one way of economy and technology analysis for enterpriser and one way of production for new motor and transformer trial-produce .
Effect of Rare Earth on Inclusions and Impact Property of Ferrite Stainless Steel
Authors: Liu Xiao , Fan Zhi Jie
Published: June 2012

The effects of RE metals on the inclusions and the impact property of 430 ferrite stainless steel were studied by metallographic examination, scanning electron microscope (SEM) and energy spectrum analysis. The results show that the morphologies and sizes of inclusions in 430 ferrite stainless steel are changed, and RE played a very good role of modifying inclusions. The fracture mode of 430 ferrite stainless steel is typical cleavage fracture, but quasi-cleavage and dimple fracture after adding RE into the steel. The transverse impact property of 430 ferrite stainless steel is improved obviously by RE. In comparison with 430 ferrite stainless steel without RE, the transverse impact property of 430 ferrite stainless steel with RE is increased 38.53% at -20°C, respectively.
The Morphology and Content of δ Ferrite in Non-Equilibrium Solidified 0Cr18Ni9 Austenitic Stainless Steel
Authors: Shen Li Juan , Ma Yong Lin , Xing Shu Qing
Published: June 2012

The microsructural and content of δ ferrite in non-equilibrium solidified 0Cr18Ni9 austenitic stainless steel is studied by the coin with the circulating water. The solidified microstructure of the residual δ ferrite in different cooling rate is that during the course of solid-state transformation, austenite grows into ferrite gradually; corresponding to the increase of cooling rate, the microsructural of ferrite is skeletal, network, strip and block. The experiment demonstrates that the content of the residual δ ferrite is increase under the increase of the cooling rate.
Study on the Polyethyleneglycol-Based Silicon Wafer Wire Cutting Fluid for its Stability Improvement
Authors: Zhou Yong Sheng , Wang Ping , Gu Hao
Published: June 2012

Thermogravimetry (TG) analysis was employed to investigate the effects of antioxidants on the temperature response of PEG200 at 5% and 10% weight loss respectively, and to compare the TG profiles of cutting fluid 010 with that of PEG200 adulterated with antioxidants. Thermal aging method was utilized to survey the electrical conductivity, pH value and relative viscosity of PEG600 stock solution. Meanwhile, effects of 13 antioxidants on the anti-thermal oxidation activity of PEG600 was studied and the properties of the antioxidant-modified PEG were compared with that stipulated by the trade standard of silicon wafer cutting fluid in terms of electrical conductivity, pH value and relative viscosity. The results showed that addition of antioxidants such as 626, 1098, B900 and p-hydroxyanisole increased the temperature of PEG200 at weight loss significantly. A large disparity was displayed between the thermal gravity curves of cutting fluid 010 and that of antioxidants-containing PEG200. Electrical conductivities for all 13 PEG600 samples with anti-oxidants after thermal aging excel that of the manufacture’s standard. All antioxidant-modified PEG600 samples, except that containing DLTP and 626, satisfy the criteria of pH value by the manufacture’s standard. The viscosity of PEG600 changed little after adding antioxidants 1010 and B225, which revealed that these two antioxidants posses certain property of inhibiting polymerization of PEG600.
The Recrystallization Behavior Study of 3%Si Nonoriented Electrical Steel
Authors: Shi Wen Min , Liu Jing , Li Chang Yi
Published: June 2012

The recrystallization behavior of the cold rolled 3%Si nonoriented electrical steel at different temperatures is investigated by OIM(Orientation Imaging Microscopy). The results show that the recrystallization process and texture of 3%Si nonoriented electrical steel at different temperatures are determinated by different recrystallization mechanisms. At low annealing temperatures, the formation of recrystallization texture in this specimen can be explained by the mechanism of oriented nucleation theory, but at higher annealing temperatures, the formation of recrystallization texture in this specimen can be explained by the mechanism of oriented growth theory, the twin nucleation mechanism may penetrate the whole recrystallization process.
Formation of the {111}<112> and {111}<110> Recrystallization Texture in Deep Drawing Low Carbon Steel
Authors: Li Xiao , Yang Ping , Meng Li
Published: June 2012

The formation of 111-112 and 111-110 recrystallization textures during annealing of cold rolled low carbon steels at low heating rate was investigated by electron backscatter diffraction (EBSD) and X-ray diffraction techniques. The orientation characteristics during recrystallization of this steel were determined, results show that there is a strong competition between the 111-112 component and the 111-110 component along the γ-fiber. The former was developed from the deformed matrix with the same orientation by means of subgrain coalescence at early stage of recrystallization, while the latter nucleated at the grain boundary areas of deformed grains with 111-112 or 112-110 orientations by means of preferred nucleation and evolved into stable recrystallization texture at later stage of recrystallization.
Research on Micro Inclusions of SS400 Steel in Slag Washing Process
Authors: Wang Shuo Ming , Huo Yan Peng , Wang Shu Min
Published: June 2012

The variations of T[O] and [N] as well as non metallic inclusions in different working processes of two kinds of SS400 steel production process in Han Group are studied systematically by tracing experiment, systematic sampling and integrated analyzing. The following results are observed: slag washing process and traditional process can both produce qualified steel. The slag washing process has good removal effect for Al2O3 inclusion compared with the traditional process. After slag washing treatment，the content of T[O] and [N] in slab when steady-state casting are respectively 21.75×10-6 and 24.9×10-6, which are respectively 84.9% and 76.1% of the content after LF treatment. The number of the micro inclusions is 5.583 piece/mm2,which is 79.2% of the number after LF treatment.
Effect of Alloying Elements Ti and Nb on Microstructure and Performance of 3.5Ni Steel
Authors: Zhou Qian Xue , Huang Haie , Li Jian Hua
Published: June 2012

Through comparative analysis of 3.5Ni low temperature steel with appending Ti and Nb elements, the effect on the structure and performance of steel plate rolling state, normalizing state and tempering state was studied. The results showed that the mechanical strength was increased and the low temperature ductility was improved for 3.5Ni low temperature steel with appending Ti and Nb elements; the normalizing process evidently decreased the temperature of transition microstructure.
Experimental Research on Sintering Amorphous Based Material with Iron-Tailings
Authors: Deng Hong Chao
Published: June 2012

The homogeneous mixture of iron tailings powder and glass powder is as the experimental material to sinter the amorphous based material. The particle size of the glass powder is less than 0.15 millimeter, and the particle size of the iron tailings powder is from 0.07 millimeter to 2 millimeter. The weight percentages of glass powder are 10% and 15% and 22% and 25% in the experimental material, respectively. The heating rate is about 170°C•min-1 and the maximum sintering temperature is 1150°C.They are proved by the analysis results of thermo-gravimetric analysis and differential thermal analysis with the experimental material. And the sintering temperature and the heating rate of the sintering experiments were based on them. The facts that the sintered material is mostly made up of amorphous substance and contains a certain amount of crystals and it’s micromechanism is amorphous are proved out by the experiments of scanning electron microscope. The testing results of the sintered material are these that the maximum density is 2.6g.cm-1, the maximum compressive strength is 94MPa, the maximum tensile strength is 5MPa, the maximum bending strength is 28MPa, the hydroscopicity and the radioactivity is zero, and it can not be eroded by acids and alkalis. When the sintered material contains 22% glass powder, the mechanical properties of the sintered material sample is same as marble.
Effect of Titanium on Microstructure and Phase Composition of High Boron Alloyed Stainless Steel
Authors: Liu Jing , Zhang Ke , Han Jing Tao
Published: June 2012

High boron alloyed stainless steel(HBASS) with different Ti content were fabricated by vacuum induction furnace and their microstructure and boride phase were analyzed. The boride phase of HBASS do not contain Ti element is mainly (Fe,Cr)2B phase with slender rod-shape. After adding Ti into steel, because Ti and B preferentially combines into TiB2 phase with petals or small block shape which can stop the formation of hard and brittle (Fe,Cr)2B, so the number of (Fe,Cr)2B phase is reduced. And after adding Ti, many crisscross cracks appeared in internal large (Fe,Cr)2B phase, which will be effective to break into small pieces of boride to improve steel plasticity and shielding thermal neutron performance during hot rolling process.
Preparation, Decomposition and Characterizations of Bangka - Indonesia Ilmenite (FeTiO3) Derived by Hydrothermal Method Using Concentrated NaOH Solution
Authors: Hanum Lalasari Latifa , Firdiyono Florentinus , Herman Yuwono Akhmad , Harjanto Sri , Suharno Bambang
Published: June 2012

Ilmenite is an economically important and interesting mineral. It is found as a by-product of tin mining in Bangka Indonesia. This mineral has can be used as the source of making titanium metal, titanium dioxide (TiO2) pigment and material for photo catalysts. However, the synthesis of TiO2 from ilmenite using both sulfate and chloride processes still has faced a major problem to obtain white pigment of high purity and lower operation cost. This is mainly due to Fe2O3 impurity in TiO2 pigment which cannot be easily decomposed. Therefore, this study is aimed at investigating the possibility of using Bangka ilmenite mineral to obtain TiO2 pigments and photocatalysts. For this purpose, , sodium hydroxide (NaOH) was used as decomposition solution via hydrothermal process in a teflon-lined autoclave equipment. The characterization results indicated that Bangka ilmenite contains a significant TiO2 level of more than 30 %, although there still remains some other impurities. Upon decomposition of dissolution using NaOH, was decrease in impurity elements down to 60 %. The decomposition process of ilmenite was optimum at NaOH concentration of 10 M where the ilmenite decomposes to form an intermediate phase of sodium titanate with the morphological shape of fine threads.
The Effect of Cold Asynchronous Rolling Technique on High Manganese Steel Mn13
Authors: Sun Xiao Hua , Qiu Chang Ming , Wang Yan Feng , Deng Li
Published: June 2012

High manganese steel is a wear-resisting steel. With the rapidly development of industry, it is very important to improve the wear resistance of high manganese steel. We do some experiments with cold asynchronous rolling technique on austenitic high manganese steel.The results show that hardness and impact abrasion resistance are enhanced greatly with the increase of deformation, and the toughness not decrease to very low.
Effects of RE on Critical Cooling Rate of Bearing-B Steel
Authors: Zhao Yi Sheng , Zhang Xin Ming , Gao Zhi Guo
Published: June 2012

The law of phase change of bearing-B steel during continual cooling was studied by adopting dilatometer. The CCT curves of bearing-B steel were drawn, and the effects of RE on critical cooling rates were studied. The experimental results show that the start temperatures of martensite TM was decreased from 438 to 404°C. The critical cooling rate was simultaneously decreased from 33 to 15°C/s.
Research on the Structure and Friction Properties of the SiC Particles Reinforced Copper-Based Self-Lubricating Composites
Authors: Chen Sui Yuan , Fan Hong , An Di , Liang Jing , Liu Chang Sheng
Published: June 2012

Using atomizing Cu-Ni-Sn-Pb powder as the matrix alloy and adding 2wt% graphite as solid lubricant phase, a Cu-based self-lubricating composite reinforced with SiC ( with 0wt%, 1wt% and 2wt%14µm SiC) was prepared under the optimized powder metallurgy sintering condition. The structure and properties of the samples were analyzed using a scanning electron microscopy, X-ray diffraction, a tensile tester, a hardness tester, and a friction tester. The results indicate that the prepared sample of 1wt%14µm SiC, when sintered at 910°C for 4 hours, possessed a perfect composite structure in alloy strengthening, graphite lubrication and SiC particle reinforcing. The main phases consisted of α-solid solution of copper, CuNi2Sn, Pb, graphite, and SiC. The wear loss was 12.6mg and the friction coefficient was 0.26. SiC particles reinforcement was optimized using fine grain to enhance the anti-wear and self-lubricating properties of the alloy matrix.
Primary Recrystallization Texture in Rolled (Fe81Ga19)99B1 Sheet
Authors: He Zheng Hua , Su Di Yao , Sha Yu Hui , Zhang Fang , Zuo Liang
Published: June 2012

The recrystallization texture in a rolled polycrystalline (Fe81Ga19)99B1 alloy sheet was investigated using X-ray and EBSD (Electron backscattering diffraction) methods. The η fiber (//RD) with dominant Goss ({110}) component was successfully obtained through sheet thickness after primary recrystallization. Goss remains the dominant texture component during further grain growth. The development of Goss can be attributed to the specific rolling induced favorable shear band morphology and deformation texture. The results provide a prospective route for the efficient recrystallization texture optimization and economical production of Fe-Ga sheets.
The Application of SunyPCC800 in CFB Boilers
Authors: Yang Yu Ping , Xu Yun Feng
Published: June 2012

The combustion technology of Circulating Fluidized Bed Boilers is a Cleaning and high efficent of Coal Powder Combustion technology. Traditional control methods can hardly get ideal control effect. To Realize datas reading and writing by self_control software throgh DCS, when coal quality, loading altered, realized automatic closed-loop control of combustion process of circulating fluidized bed, to implement primary air flow, secondary air flow and air-induced automatic cordinated control and reached cleaning of coal quality and combustion high efficiency.
Effect of Ta, Nb and V Additions on the Microstructure and Mechanical Properties of (W,Ti)C-Co
Authors: Wu Yan , Xin Hai Xia , Zhai Yu Chun
Published: June 2012

(W,Ti)C-10%Co system cermets doped with Ta, Nb or V grain growth inhibitor were prepared in this work. The effect of Ta, Nb and V on the microstructure and mechanical properties of (W0.8783Ti0.0976VB0.0242)C-10%Co systems was investigated. The results show that the three elements play an important role on the WC grain growth and shape; the cermets appeared uniformly distributed as whiskers or thin platelets. V results in the hardest material, Ta causes the material to become harder compared with (W0.9Ti0.1)C-10%Co cermets. But the hardness of cermets with Nb addition decrease because of the increasing of porosity.