New Types, Structure of Coated Cemented Carbide—Diamond Coating 2 of 3

Take YG6 tungsten carbide drawing die as an example, it deposits diamond coating (10-30pm crystalline diamond coating) on tungsten carbide drawing die matrix by chemical vapor deposition (CVD) and the finished products after polishing, finishing and some after processing. In general, the processes of tungsten carbide drawing die with diamond coating are tungsten carbide matrix milling → matrix washing → pre-processing → pretreatment → put in furnace → diamond coating deposited → film testing → finishing and polishing → finished product.

First of all, choose YG6 tungsten carbide die (the shape and size should be similar to the finished product). Then bore milling and finishing for proper shape, and reserve the size margin about 30μm to cooperate with the thickness of the coating layer. Afterwards, it adapts sand blast to eliminate the impurities and loose material of the surface, which can achieve good roughness. After sand blasting, it should be ultrasonic cleaning by distilled water and alcohol. Finally, the drawing die corroded by the acid or alkali prepared and ultrasonic cleaning by distilled water and alcohol again. When the preparation complete, put tungsten carbide drawing die into the equipment of CVD diamond coating deposited.

The most common equipment of coating deposited is hot wire furnace, which is equivalent to a reaction chamber. the gas containing other elements constituting the respective film gaseous reactant vapor or liquid reactants and reaction necessary introduced into the reaction chamber. That is, after the pre-pass hydrogen H2 and methane, CH4, hot filament heated to 2500 ℃, by adjusting the filament temperature, gas pressure, gas flow rate and relevant process parameters, so that the mold surface of diamond film deposition of a certain thickness. There are special requirements for accuracy or surface finish can be achieved by further optimizing the surface quality of the finishing and polishing process precision, to meet different working environment for the corresponding requirements of the mold.

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