Boron carbide, commonly known as artificial diamond, is a kind of boride with high hardness, which has the advantages of high melting point density, low strength, high neutron absorption cross section, excellent thermoelectric properties and good mechanical stability Application research in aerospace is mainly focused on the heat resistant material of rocket nozzles, which itself has a high melting point and is not easy to be cast into artificial products, but can be processed into simple shapes by melting powder at high temperature.