The properties of niobium carbide are light brown metal powder with a purple metallic luster. It belongs to the sodium chloride cubic crystal system. It has the characteristics of a high melting point, high hardness, and good chemical stability. Insoluble in hot and cold hydrochloric acid, sulfuric acid, and nitric acid. It is easy to melt in titanium carbide, zirconium carbide, tungsten carbide, and other compounds to form a solid solution with isomorphism, so it can be used to manufacture cermets, heat-resistant alloys, and hard alloys. It can be used as an additive of cemented carbide, which can significantly improve its hot hardness and ability to resist thermal shock, hot pressing, and oxidation. The cutting tools made of it also have good thermal hardness, thermal shock resistance, and thermal oxidation resistance. At the same time, the composite materials prepared by it have been widely used in fusion reactors, machining, metallurgy, aerospace, and other fields.