<unk>  (Cr3C2) is an extremely hard refractory ceramic material. It is usually processed by sintering. It has the appearance of a gray powder with orthorhombic crystal structure. Its CAS number is 12012-61-9.
Other compositions are available, eg. Cr23C6, and Cr7C3.<unk>  is used as a thermal spray material for protecting the underlying metal surface, and as an additive to corrosion-resistant and wear-resistant materials. It is used in coatings of bearings, seals, orifices, and valve seals, and as a fine-crystal phase in other sintered<unk> s, where, like the vanadium<unk> , it inhibits growth of submicrometre grains during pressing and sintering. It is highly corrosion-resistant, and does not oxidize even at high temperature (1000-1100 °C). The powder for coating costs $40-$65 per pound.
The thermal expansion coefficient of<unk>  is almost equal to that of steel, reducing the mechanical stress buildup at the layer boundary.
Precipitation of<unk>  at the grain boundaries, depleting the grain edges of<unk> , is the cause of intergranular corrosion of stainless steel near the welds.
Physical Properties:
Density ( kg/m³ ): 	6,650-6,680 (Cr3C2)
Melting point ( °C ): 	1250 (Cr23C6), 1665 (Cr7C3), 1890 (Cr3C2).
Chromium carbide
Tantalum carbide
Psyllium
Cadmium oxide
Cadmium sulfide
Arsenic tribromide
Vinyl chloride
Xylene