Silicon nitride ceramics is a new type of non-metallic ceramic material for high-temperature applications. It is characterized by high strength at room temperature and high temperature. The strength of silicon nitride can be maintained at 1200 °C; It has good thermal conductivity and low coefficient of thermal expansion, making it a ceramic material with excellent thermal shock resistance.
In addition to excellent thermal application properties, silicon nitride also has good mechanical, chemical, and electrical properties. It has good strength, good flexibility and wear resistance; it is an electrical insulating ceramic material with good performance; it is corrosive to all inorganic acids, most organic acid solutions and some caustic soda solutions.
Silicon nitride ceramics (Si3N4) have excellent performance, but their mechanical properties are poor, and Si3N4 ceramics are easy to oxidize at high temperature, such as low linear expansion coefficient and excellent thermal shock resistance; at 1300 °C, the strength has good performance at high temperature and normal temperature. At the same time, it has high mechanical properties; good dielectric properties, stable chemical properties, outstanding oxidation resistance, good thermal stability, low dielectric loss, and high erosion resistance. It is a ceramic with excellent comprehensive properties. The use temperature in material reducing atmosphere can reach 1850℃. The finishing process and method of
silicon nitride ceramic tube
: the main problem of industrial ceramics processing Although there are many methods for industrial ceramics processing, the processing cost is high, the processing efficiency is low, and the processing accuracy is poor. One of the main reasons is that the hardness of ceramics is very high. For industrial ceramic unfired or baked bodies, cutting is mainly used for rough machining, and grinding is used for finishing after sintering.
At present, it is common for high-speed bearings that bearing steel balls cause different degrees of fatigue damage and other problems. In order to improve the performance of high-speed bearings and increase their fatigue life, countries all over the world use structural ceramics to produce balls or other rolling bearing parts, which significantly improves high-speed bearings. The performance index and service life of bearings Among them, silicon nitride or silicon nitride-based ceramic polymer materials are recognized as the most ideal raw materials for the production of rolling bearings and parts.