chromium carbide powder is an excellent spray coating material that produces a dense, well-bonded coating with exceptional hardness and resistance to high temperatures. It is widely used for fretting and abrasive wear, hard surfacing, and other applications that require protection against corrosion, heat, and oxidation.

Chemical Formula: Cr3C2

This chromium carbide is orthorhombic crystals with an oxidation resistance of up to 1500 deg C and a microhardness of 2280 kg/mm2. It is an effective coating for oxidation protection of carbon-carbon composites through pack cementation.

A variety of metallurgical processes are frequently carried out with chromium carbide as an additive. These include additions to sintered carbides to inhibit grain growth and coatings for high-stress components that are exposed to extreme levels of abrasion, corrosion, and oxidation.

The chemistry of chromium carbide is complex and involves the formation of three different crystal structures. The first is the cubic structure Cr23C6 with a microhardness of 976 kg/mm2, and the two other compositions are the hexagonal structure Cr7C3 and the orthorhombic structure Cr3C2.

Carbide distribution within the particle: a function of method of production

When a mixture of solid carbon plus chromium is heated in vacuum, the predominant form of carbide distribution within the particles shown in FIG. 4 occurs because the carbon tends to react with the chromium surface closest to it. The ultimate extension of this trend is achieved when the mixture is heated in a hydrogen atmosphere (which results in a hydrocarbon gas). The finer and more uniform the distribution of carbon in the starting mixture, the more uni-form the carbide distribution will be.

tags: Semiconductors semiconductor industry