What is chromium carbide?

CR3C2

chromium carbide, chemical formula Cr3C2, the relative atomic weight of 180.02, theoretical carbon content 13.344%, as a gray powder, rhombic crystal structure, a = 2.821, b = 5.52, c = 11.46, insoluble in water, acids and bases . Theoretical density of 6.68 g / cm3, melting point: 1890 ℃, boiling point: 3800 ℃.

Microhardness 2200-2700kg / mm2, thermal expansion coefficient 10.3 × 10-6 / K. It is a high-temperature environment (1000 ~ 1100 ℃) has good wear resistance, corrosion, oxidation of refractory inorganic materials, and is widely used as a metal surface protection and thermal spray material wear, also used as other grain refining agent carbide wear and corrosion resistance elements. In Cr3C2-based cermet at high temperatures extremely excellent oxidation resistance, thermal exposure at 982 ℃ after five hours, the surface is only slightly dimmed; and under the same conditions, 18-8 stainless steel has significant damage, WC-6Co alloy is completely oxidized.

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