Active zinc oxide is a kind of white or yellowish spherical fine powder with a density of 5.47g/cm3, melting point of 2073K.……

Zirconia is the main oxide of zirconium, usually white odorless and tasteless crystal, insoluble in water, hydrochloric acid and dilute sulfuric acid.……

Aluminum nitride AIN is famous for its high thermal conductivity and excellent electrical insulation.……

Boron nitride is an advanced synthetic ceramic material. Boron is found in a large number of mineral ores-borax.……

Silicon nitride is a kind of ceramic material with excellent thermal and chemical properties, which has high hardness, stable structure, low coefficient of thermal expansion, good oxidation resistance and corrosion resistance.……

Alumina belongs to the rhombohedral system with a melting point of 2054 ℃ and a boiling point of 2980 ℃.……

Boron carbide is a black metallic glossy crystal, commonly known as black diamond, which is a kind of powder product made from boric acid as the main raw material, adding carbonaceous materials such as petroleum coke, smelting and crushing at high temperature. It belongs to super...……

Before the invention of boron carbide in 1929, silicon carbide was the hardest synthetic material known. It has a Morse hardness of 9, close to diamonds.……