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Silicon nitride is a compound of silicon and nitrogen. Silicon nitride is an important structural ceramic material with high hardness, inherent lubricity, and wear resistance. It is an atomic crystal it is resistant to oxidation at high temperatures
Chromium carbide (Cr3C2) is a refractory ceramic compound. As the name implies, chromium carbide is a combination of chromium and carbon. Chromium carbide has high hardness, high strength and good corrosion resistance.
Manganese oxide is an inorganic compound with the molecular formula of manganese dioxide. This black or brown solid naturally exists as the mineral pyrolusite, which is the main ore of manganese and a component of manganese nodules.
Boron nitride with the chemical formula BN is a thermally and chemically resistant refractory compound of boron and nitrogen.