Advanced Ceramic Materials

Bearing Material Selection The choice of bearing material is essential for its reliable operation. For many years, materials such as rubber, bronze and ceramics have been used to make bearings. Different materials have different effects. Among them, ceramics and graphite are widely used in bearing manufacturing. Silicon Carbide Bearing There are many types of ceramic materials including oxides, borides, and nitrides. The typical ceramic material used for bearing manufacturing and achieving good performance is silicon carbide. Silicon carbide is sintered at high temperature in a resistance furnace using quartz sand, petroleum coke and other raw materials. It is a hexagonal crystal with a relative density of 3.20 to 3.25 g / cm3 and a micro hardness of 2 840 to 3320 kg / mm2. Silicon carbide has the advantages of high hardness, good wear resistance, corrosion resistance, oxidation resistance, and low temperature creep. It has been widely used as a wear part in many fields.

Hexagonal boron nitride is a white powder with good lubrication properties, high temperature resistance, corrosion resistance, high thermal conductivity, and good insulation properties. HBN is called white graphite because it has a similar layered crystal structure and physical and chemical properties similar to graphite (good lubricity and thermal conductivity). It is commonly used as a sintered ceramic material. In addition, due to its high thermal conductivity, good electrical insulation properties, low thermal expansion coefficient and non-thermal properties, h-BN structural ceramics have been widely used in high temperature insulation components, atomic energy, metallurgy, aviation and other fields. As a raw material for synthesizing cubic boron nitride, hexagonal boron nitride is a theoretical low-temperature stable phase, and its excellent performance is more attractive. Therefore, hexagonal boron nitride is commonly used to synthesize cubic boron nitride. Hexagonal boron