Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
What aspects of silicon nitride
are used in semiconductors In recent years, with the development of testing and analysis technology and manufacturing technology, the reliability of silicon nitride ceramic products has been continuously improved, so the application area is also expanding. The silicon nitride ceramic engine developed has made great progress, which has become a world-renowned event in national science and technology. The contents related to its application are: (1) In the metallurgical industry: the muffle furnace is made , Burners, crucibles, casting molds, aluminum liquid conduits, thermocouple temperature measurement protection sleeves, heating element fixtures, aluminum electrolytic cell linings and other thermal equipment; (2) In the chemical industry: made of pump bodies, Sealing rings, combustion boats, ball valves, heat exchanger components, filters, immobilized catalyst carriers, evaporators, etc.; (3) In the machinery industry: bearings, high-speed turning tools, supports for heat treatment of metal parts, and rotor engines Scraper blades, guide blades of gas turbines, turbine blades, etc.; (4) In aviation, semiconductor, atomic energy and other industries: used to manufacture film capacitors, electrical insulators that withstand high temperatures or drastic temperature changes, switch circuit substrates, missile tail nozzles, Spacers and supports in atomic reactors, carriers of nuclear fission materials, etc.; (5) The silicon nitride all-ceramic engine under development replaces the same type of metal engine. Silicon nitride ceramics replace alloy steel to make ceramic engines, and their working temperature can reach 1300°C to 1500°C. In 1998, the US military conducted an interesting experiment: two vehicles were parked on the starting line of the 200-meter runway in the exercise field. Tanks, one is equipped with a 500-horsepower steel engine, and the other is equipped with a ceramic engine with the same horsepower. After fully warming up and running, it takes 26 seconds to run the whole course. The thermal efficiency of the ceramic engine is high, which not only saves 30% of heat energy, but also increases the working power by more than 45% compared with the steel engine. In addition, the ceramic engine does not need a water cooling system, and its density is also high. It is only about half of steel, which is also of great significance for reducing the weight of the engine itself. Silicon nitride ceramics have advantages that other raw materials such as metal materials do not have, that is, high-quality temperature resistance, strength, wear resistance, corrosion resistance and light weight, etc., but porcelain also has brittleness, impact resistance and high temperature resistance. The disadvantage of low damage is that the application of the function is greatly limited.