bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Plasma-Sprayed Processes on La10(SiO4)6O3 Electrolyte Coatings
Authors: Gao W. , Lapostolle F. , Liao H.-L. , Coddet C. 
Published: December 2022

Abstract
La10(SiO4)6O3 electrolyte ceramic coatings based on solid oxide fuel cell (SOFC) operated at intermediate temperature were deposited onto an aluminum substrate by atmospheric plasma spraying (APS). By proper selection of the spraying parameters, particularly, adjusting the hydrogen gas flow rate, the sprayed La10(SiO4)6O3 electrolyte ceramic coatings show a good densification. The results suggested that the use of APS technique allowed providing new opportunity in novel electrolyte ceramic coating preparation with low production costs.
Mullite and Mullite/ZrO2-7wt%Y2O3 Powders for Thermal Spraying of Environmental Barrier Coatings
Authors: Garcia E. , Guimarães J. , Miranzo P. , Osendi M.I. , Wang Y. , Lima R.S. , Moreau C. 
Published: December 2022

Abstract
In this study, two processing routes are used to produce mullite powders for thermal spraying and the influence of each method on particle morphology and microstructure is investigated. Different thermal treatments are performed to improve grain cohesion and powder flow and their effect on the crystal structure of the powder is assessed as well. The powders are plasma sprayed, in-flight characteristics are measured, and splats are collected and analyzed. A correlation among powder morphology, in-flight particle properties, and splat morphology is established to better understand the influence of powder processing route on coating formation.
Latest Developments in Suspension and Liquid Precursor Thermal Spraying
Authors: Fauchais P. , Montavon G. 
Published: December 2022

Abstract
This review presents recent developments in suspension and solution precursor thermal spraying and demonstrates some of the tools available to characterize plasma-liquid interactions and the coatings produced. It compares and contrasts the two methods with conventional thermal spraying routes and identifies areas needing improvement.
Microstructures and Functional Properties of Al2O3 and TiO2 Suspension Sprayed Coatings: An Overview
Authors: Toma F.-L. , Berger L.-M. , Stahr C.C. , Naumann T. , Langner S. 
Published: December 2022

Abstract
This paper describes the properties and behaviors of alumina and titania coatings that have recently been produced using suspension spraying techniques. It examines coating microstructures and phase compositions are shows how they are influenced by different operating parameters and interactions. A selection of new experimental results obtained by the authors is also presented. In the case of Al2O3, the goal was to retain a high ratio of the thermodynamically stable α-phase. In the case of TiO2, the spraying process was optimized to preserve the anatase phase in order to obtain photocatalytically active layers.
Basic Principles to Obtain Oxide Ceramic Coating Systems with Reduced Sliding Wear by Suspension Plasma Spraying
Authors: Erne M. , Bach Fr.-W. , Möhwald K. , Kolar D. 
Published: December 2022

Abstract
In this study, suspension plasma spraying is used to produce self-lubricating titanium oxide coatings. Certain nonstoichiometric titanium oxide phases, called Magneli phases, exhibit a reduction in friction under dry sliding conditions at elevated temperatures. These phases, however, tend to undergo crystal changes during thermal spraying, resulting in the loss of their good friction behavior. In this work, the goal is to stabilize these phases with suitable lattice substitutions for Ti4+. The resulting phases are shown to be homologous to TinO2n-1, but have the advantages of a three-component system, making them more thermally stable with a broader area of formation.
Improved Deposition Characteristics of Diamond Enhanced by Plastically Deformed Nickel Layer in Kinetic Sprayed Bronze-Diamond Composite Coating
Authors: Na H. , Bae G. , Yoon S. , Lee C. , Kim H.J. 
Published: December 2022

Abstract
This study compares the deposition behavior of kinetic sprayed bronze-diamond composite coatings produced using different mixtures of helium and nitrogen gas. To determine impact properties of the diamond particles, bare and nickel-coated diamonds are deposited on bronze layers and the effects of plastic deformation are examined using SEM and finite-element analysis. The results indicate that the deposition efficiency of diamond is determined by several factors and depends more on the angle and shape of the diamond particles than on the deformation properties of the bronze matrix.
Structure and Corrosion Behavior of Cold-Sprayed Tantalum Coatings
Authors: Koivuluoto H. , Vuoristo P. , Näkki J. 
Published: December 2022

Abstract
Cold spraying enables the production of pure and dense metallic coatings with very little porosity and oxygen content, all of which play an important role in corrosion resistance. This study investigates the microstructure, denseness (impermeability), and corrosion properties of tantalum coatings produced by high-pressure cold spraying. Various tests were conducted to assess corrosion behaviors in different aqueous solutions. Microstructural studies showed that interfaces in the coatings were practically free of voids and confirmed that high levels of localized plastic deformation occurred as expected during spraying. The study also confirmed that the polarization behavior of the cold-sprayed tantalum is similar to that of the corresponding tantalum bulk in saline as well as sulfuric and hydrochloric acid solutions.
Fabrication of Cu-MoS2 Composite Coating by Cold Spraying and Evaluation of Its Property
Authors: Yamada M. , Wakabayashi J. , Fukumoto M. , Kitamura J. 
Published: December 2022

Abstract
Molybdenum disulfide (MoS2) films are widely used to improve friction performance, but they are difficult to fabricate using conventional thermal spray processes due to thermal decomposition of the feedstock powder. In this study, Cu-MoS2 composite coatings are fabricated by cold spraying using mechanically milled powders containing different concentrations of MoS2. Investigators found that increasing the concentration of MoS2 in the powder improved some coating properties while degrading others. Through testing it was determined that the ideal concentration of MoS2 is 5wt%. Increasing the milling time of the powder mixture also provided benefits in terms of hardness and wear resistance.
A Study on the Influence of Plasma Deposited HA and TiO2 Coatings on Fatigue Lives of Low-Carbon Steel Specimens with Respect to Various Powder In-Flight Properties
Authors: Cizek J. , Khor K.A. , Siegl J. , Bensch J. 
Published: December 2022

Abstract
This work investigates the influence of plasma-sprayed deposits on the fatigue life of coated specimens. Hydroxyapatite (HA) and TiO2 were deposited on dog-bone shaped substrates under different spraying conditions while measuring in-flight particle temperature and velocity. The coated specimens were then subjected to cyclic bending with constant deflection and the number of cycles to failure was recorded. It was found that the higher the temperature and velocity of particles during spraying, the greater the improvement in fatigue life up to a maximum of 46% compared to uncoated samples.
Antibacterial Property and Biocompatibility of Plasma Sprayed Hydroxyapatite-Silver Composite Coatings
Authors: Zheng Xuebin , Chen Yikai , Xie Youtao , Ji Heng , Huang Liping , Ding Chuanxian 
Published: December 2022

Abstract
In this study, vacuum plasma spraying was used to apply hydroxyapatite-silver composite coatings on titanium substrates, which were then exposed to E. coli, Pseudomonas aeruginosa, and Staphylococcus aureus. The coatings exhibited excellent antibacterial performance (K &gt; 95%) against all three strains, attributed to the release of silver ions. Cytotoxicity, hemolysis, and simulated body fluid immersion tests showed that added silver affects neither the biocompatibility nor bioactivity of the hydroxyapatite, one of the most widely used medical implant materials due to its close chemical structure with natural bone.
Bio-Ceramic Composite Coatings by Cold Spray Technology
Authors: Choudhuri A. , Mohanty P.S. , Karthikeyan J. 
Published: December 2022

Abstract
This work shows that hydroxyapatite (HA) can be cold sprayed simultaneously with titanium to form thick biocompatible coatings without compromising the phase constituents of the bioceramic material. XRD analysis indicates that the phase composition of the HA in the deposit is identical to that of the powder. The work also shows that very dense Ti and Ti-HA composite coatings can be produced using sponge Ti powders and nitrogen process gas. The adhesion strength of the cold-sprayed Ti-HA exceeded the reported values of comparable plasma-sprayed coatings.
Behavior of HVOF WC-10Co4Cr Coatings with Different Carbide Size in Fine and Coarse Particle Abrasion
Authors: Ghabchi Arash , Varis Tommi , Turunen Erja , Suhonen Tomi , Liu Xuwen , Hannula S.-P. , Ghabchi Arash 
Published: December 2022

Abstract
This study assesses the effect of carbide grain size on the wear performance of HVOF-sprayed WC-CoCr coatings. The coatings were produced from two powders, one of conventional grain size and one with submicron carbide. Both coatings were subjected to abrasive rubber wheel wear tests in wet and dry conditions with 220 nm titania particles and 368 μm sand particles, respectively. Detailed examination before and after wear tests shows that the wear mechanism depends on the relative size of the carbide and abrasive particles.
Nano Particle Embedded High Temperature FGM Coatings by Hybrid Spray Process
Authors: Guduru R.K. , Varadaraajan V. , Roche A.D. , Mohanty P.S. 
Published: December 2022

Abstract
This study evaluates the potential of functionally graded composite coatings fabricated with a novel spraying process. The hybrid process embeds varying amounts of ceramic particles in a metal matrix by combining HVOF and wire arc spray streams. In this case, ceramic nanoparticles (SiO2, Cr2O3, Al2O3) from liquid precursors are embedded in a matrix synthesized from NiCr wire feedstock. The resulting coatings are evaluated based on high-temperature performance and the composition and dispersion of particles in the NiCr matrix. Uniform size distribution and dispersion of nanoparticles is shown to correlate not only with denser coatings, but also improved corrosion, wear, and oxidation resistance.
Numerical Model for Liquid Precursor Break-Up under Plasma Spray Conditions
Authors: Marchand C. , Mariaux G. , Vardelle M. , Vardelle A. , Lefort P. 
Published: December 2022

Abstract
Plasma spraying using liquid precursors makes it possible to produce finely-structured coatings with a broad range of microstructures and properties. Nonetheless, issues with coating reproducibility and control of deposition efficiency continue to be a concern. With conventional dc plasma torches that inject liquid feedstock transversely into the plasma stream, coating quality depends on transient interactions between the liquid and plasma jet. Numerical models may assist in understanding these interactions provided they are able to predict droplet fragmentation, which determines the trajectories of droplets and their behavior in the plasma flow. Although various models for droplet fragmentation have been proposed in the literature, they include parameters and constants that need to be validated for plasma spraying conditions. This study simulates liquid material injection and break-up in the plasma jet using an enhanced Taylor analogy break-up (TAB) model. Model constants are adapted to plasma spray conditions by observation of liquid behavior in the plasma flow, which is accomplished by means of a shadowgraph system using pulsed backlight illumination.
Thermal and Kinetic Energy Influence on Diamonds during the Spraying of Diamond-Bronze Abrasive Coatings
Authors: Nebel J. , Vogli E. , Tillmann W. 
Published: December 2022

Abstract
Detonation spraying provides the opportunity to produce superabrasive diamond grinding tools under atmospheric conditions. In this study, several methods are used to assess the effects of the spraying process on diamond particles, including SEM analysis, energy dispersive X-ray spectroscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy, and friability and fracture force testing. It was found that under optimized conditions, the thermal and mechanical impact of the detonation can remain low enough to ensure the reliability of the diamonds with no adverse effects.
Preparation and Ion Diffusion Performance of the Nanoporous TiO2 Coating through Vacuum Cold Spray
Authors: Yang G.-J. , Li C.-J. , Li C.-X. , Gao J.-C. , Fan S.-Q. 
Published: December 2022

Abstract
This study investigates the effect of powder size on the porosity and diffusion properties of vacuum cold sprayed TiO2 coatings. In the experiments, coating samples are produced using powders with different primary particle sizes. Porosity and pore size in the TiO2 coatings are assessed via nitrogen adsorption and desorption and correlated with the diffusion coefficient of I3ֿin acetonitrile. The results show that pore size is significantly influenced by primary particle size, but porosity is the same regardless of the particle size of the powder. The I3ֿion diffusion coefficient is shown to increase with increasing pore size and can thus be adjusted through proper selection of the powder feedstock.
Structural, Mechanical and Erosion Properties of Plasma Sprayed Yttrium Oxide Coatings by Axial Injection of Fine Powder Slurries for Semiconductor and Flat-Panel-Display Applications
Authors: Kitamura J. , Ibe H. , Yuasa F. , Tang Z. , Burgess A. 
Published: December 2022

Abstract
In this study, high-power axial-injection suspension plasma spraying is used to synthesize yttrium oxide coatings from fine powder slurries. The coatings are assessed based on microstructure, hardness, and porosity and compared with coatings produced by other spraying methods. Resistance to erosion from CF4 containing plasma is also investigated. Test results show that the suspension plasma sprayed Y2O3 coatings are superior in terms of density, hardness, uniformity, and plasma erosion resistance. They also retain a smoother surface when exposed to plasma that contains CF4.
Production of Particle Reinforced Graded Coatings by Wire Arc Spraying
Authors: van Rodijnen F. , Knapp S. , Wilden J. , Jahn S. , Drescher V.E. 
Published: December 2022

Abstract
The aim of this investigation is to show that it is possible to inject powder into a wire arc spray process as an alternative to using cored wire to produce particle-reinforced coatings. The equipment, materials, and procedures used are described in the paper along with the microstructure and properties of the coatings obtained. By changing the feedrate of CrC particles injected into a stream of chromium steel droplets, particle-reinforced graded layers were produced by wire arc spraying on the fly without having to stop the process.
Influence of Spray Gun Moving Direction on Properties of Twin Wire Arc Sprayed Hard Material Based Layers
Authors: Tillmann W. , Vogli E. , Abdulgader M. , Carpenter K.R. , Monaghan B.J. , Norrish J. 
Published: December 2022

Abstract
The intent of this study is to gain a better understanding of the twin wire arc spray process, particularly the correlation between spray path or gun movement and coating quality. Coatings were deposited on steel substrates using solid nickel and cored WC-Cr wire while moving the gun in various directions relative to the orientation of the electrodes. The coatings obtained are evaluated based on porosity, hardness, thickness, adhesion strength, and microstructure. It is observed that gun movements cause inhomogeneities in the spray cone that affect different coating properties in different ways depending on the direction of the movement and gas pressure.
Low Cost HVAF for Thermal Spraying of WC-Co
Authors: Gorlach I.A. 
Published: December 2022

Abstract
In this research, a low cost high-velocity air-fuel (HVAF) system was developed and applied for thermal spraying of WC-Co coatings. The resulting coatings were evaluated using optical and scanning electron microscopy (SEM), X-ray diffraction (XRD) and Vickers microhardness measurements. The quality of sprayed WC-Co coatings shows that the developed HVAF system can be an alternative to the existing HVOF with substantial savings on operating costs.
Use of Low-Pressure Plasma Spraying Equipment to Produce Thin Films and Thick Coatings Using Liquid and Gaseous Precursors
Authors: Guittienne Ph. , Hollenstein Ch. , Dorier J.-L. , Gindrat M. , Refke A. 
Published: December 2022

Abstract
This work shows that low-pressure plasma spraying equipment can be used to deposit layers of varying thickness from liquid or gaseous precursors. In particular, HMDSO and oxygen are used to deposit SiOx thin films over large areas at deposition rates exceeding 35 nm/s and conversion efficiency better than 50%. The coatings are analyzed ex-situ by FTIR absorption spectroscopy and the microstructure and morphology of layer cross-sections are examined by SEM. The effects of various process parameters are investigated as well.
The Development and Characterization of Novel Yttria-Stabilized Zirconia Coatings Deposited by Very Low Pressure Plasma Spray
Authors: Spinhirne N. , Hirschfeld D. , Hall A. , McCloskey J. 
Published: December 2022

Abstract
In this investigation, very low pressure plasma spraying (VLPPS) was used to produce yttria-stabilized zirconia (YSZ) coatings through both liquid and vapor deposition. Coatings created by liquid deposition were found to have a microstructure consisting of dense splats, while vapor-deposited layers exhibited a columnar structure similar to coatings produced by e-beam PVD. Columnar microstructure formation was dependent on substrate temperature and vapor flux continuity. Clear evidence of competitive crystal growth was observed in well-defined columnar coatings. Microstructures consisting of layers of splats and columns were also observed.
Novel NiZn-Ferrite Powders and Coatings for Electromagnetic Applications
Authors: McCartney D.G. , Zhang D. , Yellup J.Y. , Brühl M. , Bobzin K. , Richardt K. , Talako T. , Ilyushchanka A. 
Published: December 2022

Abstract
This paper reports on the development of NiZn-ferrite powders and their deposition by air plasma and high-velocity oxyfuel spraying. The microstructure and phase composition of the powders and coatings are analyzed and the influence of process parameters on coating development is assessed for sprayed layers up to 500 μm thick. Particular attention is paid to the degradation of the spinel crystal structure, the formation of iron oxide phases, and elemental loss during spraying. The results show that a degree of ferrite decomposition occurs with the loss of zinc and formation of wüstite and that zinc loss is very dependent on the surface-to-volume ratio of the powder.
Preparation of High-Purity Yttria Powders and Coatings
Authors: Ji X.-J. , Ren X.-J. , Li Zh.-D. , Huang X.-Ch. , Hou W.-Ao 
Published: December 2022

Abstract
High-purity globular yttria powders prepared by spray drying and sintering were deposited by air plasma spraying. The effect of powder properties and spraying parameters on coating structure and porosity was investigated. Yttria powders with grain size in the 20 to 50 μm range and loose density greater than 1.2 g/cm3 seemed to be the optimum selection for producing dense, high-quality coatings.
Estimation of Molten Content of the Spray Stream from Analysis of Experimental Particle Diagnostics
Authors: Srinivasan V. , Sampath S. 
Published: December 2022

Abstract
Particle melting is one of the key issues in air plasma spraying of high-temperature ceramics such as YSZ. This study aims to estimate the molten content of the spray stream from in-flight particle temperature measurements. Particle temperature distribution is delineated into particle states (unmolten, partially molten, completely molten) as a first approximation, which is then used to estimate the molten content in the spray stream. The estimated percentage of molten content is shown to correlate well with deposition efficiency measurements for a wide range of process conditions and feedstock characteristics. The use of this estimation technique for other materials and processes is also discussed.
Microstructure, Mechanical and Shielding Properties of Fe67.5Ni23.5B9 Coating / 321 Stainless Steel Laminated Composite by the Air-Plasma Spraying Procedure
Authors: Yang W. , Zhou C. 
Published: December 2022

Abstract
In this study, boron-rich iron-nickel coatings were deposited on stainless steel by air-plasma spraying. Coating microstructure was characterized by SEM, EDS, and XRD analysis and adhesion strength, tensile properties, and residual stress were measured. The shielding effectiveness of the coating samples, including their ability to absorb thermal neutrons and attenuate γ rays, was investigated as well. The results show that the coating samples possess the microstructure and properties necessary for possible use in radiation shielding systems.
Characterization of Atomized Metallic Powders Using De Laval Nozzle
Authors: Khatim O. , Planche M.P. , Dembinski L. , Coddet C. 
Published: December 2022

Abstract
The aim of this work is to analyze the morphology and composition of iron-aluminide (FeAl) powders produced by liquid metal atomization using a de Laval nozzle. The variables studied are atomization gas pressure and melt nozzle diameter. Different sized powders were characterized via SEM, XRD, and EDS analysis and were found to be similar in composition and shape (spherical) regardless of their size. The paper provides a detailed description of how the powders were produced, classified, and tested, and presents and interprets the results.
Improvement of Impact Resistance of WC-Cr3C2-Ni Based Coatings by Means of Hardness Control of Undercoat
Authors: Kitamura J. , Osawa S. , Ibe H. , Mizuno H. , Tawada S. 
Published: December 2022

Abstract
This study shows how the impact resistance of WC-Cr3C2-Ni coatings can be improved by as much as an order of magnitude through the addition of an undercoat with suitable hardness. It also investigates the effect of powder modifications and substrate hardness. Undercoats with Vickers hardness ranging from400-600 HV provided the biggest increases in impact resistance, but at around 700 HV and above, they are shown to have the opposite effect. The influence of the process used to apply the undercoat and the magnitude of the impact load used for testing are also considered in the study.
The Electrical and Mechanical Properties of Kinetic Sprayed Carbon Nanotube Aluminum Composite Coating
Authors: Kang K. , Xiong Y. , Lee C. 
Published: December 2022

Abstract
In this investigation, carbon nanotube (CNT) aluminum composite coatings are produced by kinetic spraying. Electrical and mechanical properties are evaluated and compared with those of cold-sprayed pure aluminum coatings. The CNT aluminum composite coatings exhibited higher conductivity and hardness than the pure aluminum, which is attributed to the high electrical conductivity and dispersion hardening effects of embedded CNTs in the aluminum matrix.