ZrC, gray, face-centered cubic lattice. Melting point 3540 ℃, the theoretical density of 6.66 g / cm 3, the thermal expansion coefficient of 6.7 × 10-6 ℃ -1, microhardness 2600kg / mm2, a resistivity of 57 ~ 75 / μΩ · cm, strong oxidation start temperature of 1100 to 1400 ℃. Do not dissolve in hydrochloric acid, but soluble in nitric acid. ZrO2 powder is generally used carbon reduction in the system, and then through molding and sintering ceramics become. It can be used as electrodes, refractory crucible and the cathode electron emission materials. VC silvery white crystals. Density 5.25 ~ 5.4g / cm3. Melting point 2750 ℃. Slightly harder than quartz. Vanadium pentoxide obtained by coke reduction system. Mainly for the manufacture of vanadium steel.
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