Mold components Thermal Diffision Carbide Coating Process
Thermal Diffision Carbide Coating Process referred TD coating. Because the technology was developed by Toyota Central Research first developed and patented, also known as Toyota Diffusion Process, called TD Process That TD process. China is also known as molten salt infiltration metal. Regardless of its name, its principle is the workpiece into the molten mixture, borax, metal carbide coating is formed by a high temperature diffusion on the surface, the coating may be a carbide of vanadium, niobium, chromium carbide, may be its complex carbide, currently the most widely used is vanadium carbide coating.
The main features of vanadium carbide coating are:
(1) coating of high hardness, HV up to 2800-3200, much higher than the nitriding and hard chrome plating, which has a much higher than those of surface treatment abrasion resistance, strain, corrosion and other properties;
(2) because it is formed by diffusion, so the coating and the substrate having a metallurgical bonding, bonding cover layer and the substrate than hard chrome plating and PVD or PCVD coating as much titanium story, which is kind of the molding Application of mold is extremely important.
TD process is to mold or workpiece placed special molten salt medium at 900 degrees to 1030 degrees work environment, or the surface of the mold components to form a 5- to 15μVC (vanadium carbide) film Cheng.
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