Silicon nitride ceramic is a kind of inorganic material ceramic. The strength of silicon nitride is very high, especially hot pressed silicon nitride, which is one of the hardest substances in the world. It has the properties of high strength, low density and high temperature resistance
Si3N4 ceramic is a covalent compound, the basic structural unit is a tetrahedron of [SiN4], the silicon atom is located in the center of the tetrahedron, and there are four nitrogen atoms around it, which are located in the four vertices of the tetrahedron, and then in the form of each three tetrahedron sharing one atom, forming a continuous and sturdy network structure in three-dimensional space
The theoretical density of Si3N4 is low, and it is much lighter than steel and engineering ultra-heat resistant alloy steel, so it is very suitable to replace alloy steel with Si3N4 ceramics in those places that require materials with high strength, low density, high temperature resistance and other properties
The light weight and high stiffness of Si3N4 can be used to manufacture ball bearings, which have higher accuracy than metal bearings, generate less heat, and can operate in higher temperature media