Please select the most similar patent number from A, B, C and D. Which number is?
Provided are a diamond composite phase material and a preparation method therefor. Onion carbon is used as a raw material, and a novel diamond composite phase bulk material containing multiple types of diamond phases of 3C, 2H, 4H, 6H, 8H, 10H, 9R, 15R and 21R is prepared by means of a high-temperature and high-pressure synthesis method. Two or more types of diamond phases of 2H, 3C, 4H, 6H, 8H, 9R, 10H, 15R and 21R can be found in the crystal grains of the bulk material. Among them, the 3C type diamond has an ultra-fine nano-twin crystal structure with a twin crytal width of 1-15nm. The diamond composite phase bulk material has an internal grain size of 2-80 nm, a Vickers hardness of 150-260 GPa, and a fracture toughness of 12-30 MPa m 1/2 . The diamond composite phase bulk material has broad applications in the fields of precision and ultra-precision machining, wire drawing dies, abrasives and special optical components.
A: Provided are a novel ceramic-based diamond composite sheet and a preparation method therefor, which belong to the technical field of composite materials. The ceramic-based diamond composite sheet comprises a ceramic matrix that is provided with a diamond layer; the diamond layer is composed of diamonds, and the form of the diamonds is powder or a thin film; the distribution means of the diamond layer in the ceramic matrix is single-layer distribution or multi-layer distribution, and the distribution location of the diamond layer in the ceramic matrix is located in a middle region or a surface region. The heat dissipation and heat conduction controllability of the ceramic material are greatly improved, and at the same time, the bonding strength between the diamonds and the ceramic matrix is improved, and a ceramic-based diamond composite sheet that has an excellent heat dissipation performance and a controllable heat conduction direction is obtained.
B: Disclosed are a metal-based/diamond laser composite coating and preparation method thereof, the method comprising: first selecting high-hardness metal powder and diamond powder of a proper grain size and shape; then uniformly mixing the high-hardness metal powder and diamond powder via a ball-milling method; and finally preparing a composite coating on a substrate by synchronously combining laser texturing technology, laser thermal treatment technology and cold spraying technology. The thickness of the composite coating is greater than 1 mm, and the volume content of diamond in the coating is greater than 45%. The present invention prepares the composite coating by utilizing high-hardness metal powder as a diamond binding phase, improves the bonding strength of the composite coating and the substrate via pulse laser texturing treatment, and finally prepares a stable, quality and high-hardness metal-based/diamond composite high abrasion resistant coating, and realizes integration, automation and high efficiency of substrate surface treatment and coating deposition preparation.
C: Provided is a rough-surface diamond synthesis method, particularly a method of manufacturing a conductive rough-surface black polycrystalline diamond, the method comprising the following steps: 1) crushing a mixed graphite with a catalyst powder of a standard HPHT process into a cylindrical shape such that the porosity thereof is less than 35%; 2) synthesizing a diamond by using a standard HPHT process; 3) when the growth of the diamond is completed and a relative pressure decreases near to 0, while maintaining a good contact between an anvil and a synthesized block, controlling the temperature to be from 800°C to 1200°C for 60-180 min, or, when the growth of the diamond is completed, taking out the HPHT-synthesized cylinder and placing the same in a vacuum furnace to heat at a temperature of from 800°C to 1200°C for 60-180 min; 4) taking out the synthesized cylinder, removing residual graphite and catalyst therefrom, rinsing with water, carrying out staged drying or sieving after drying to classify diamond grains according to different granularity meshes, thus obtaining rough-surface diamonds with different granularities.
D: A method for producing a mushroom-shaped diamond tooth head cutting pick, comprising: compounding diamond micro-powder and a carbide substrate into a mushroom-shaped diamond composite tooth head under high temperature and high pressure conditions; melting a low melting point high strength silver-based solder on a bottom plane of diamond composite teeth, the solder being a droplet shape after solidifying due to surface tension; and meanwhile, placing same within a cutting pick matrix embedding hole preheated to a certain temperature so as to be welded into a whole. During welding, the top end of the droplet-shaped solder first contacts the bottom of the hole and melts, and gas at the bottom of the hole may be fully discharged, guaranteeing that a solder layer is free of slag inclusion, gas inclusion and free of a falsely welded surface, which solves the problem in which gas at the bottom of a hole cannot be fully discharged in traditional blind hole welding forming false welding, and avoids an adverse effect caused by high-temperature welding of diamond composite teeth, effectively enhancing the welding strength between the diamond composite teeth and a cutting pick body, and the diamond cutting pick produced has higher impact resistance and wear resistance.
Answer: C