Silicon nitride powder is a high heat ceramic materia, Si3N4 has high hardness , high melting point and stable chemical properties.It is commonly used in industry to react between high-purity silicon and pure nitrogen at 1300 degrees Celsius.Silicon nitride also has strong oxidation resistance at high temperatures.
what fields is silicon nitride generally used?
- Material science. Because silicon nitride is heat-resistant, it can be used to prepare ceramic materials, coating materials, bulletproof materials and high-strength fibers.
- Aerospace industry. Due to silicon nitride has High temperature stability and low High temperature stability,so it used for Aerospeace, spacecraft, Heat-resistant parts for rocket engines,and ceramic bearings.
- Steelmaking .In steelmaking industry ,silicon nitride can used as Refining agent ,Protective coatings and lining materials.
The latest production process of silicon nitride powder
- Pyrolysis. Pyrolysis method is a traditional method to make nitride silicon powder, it basic principle is after mixed with silicon and nitrogen, Pyrolysis generate nitride silicon pwder.Common silicon sources include silicon powder, SiO2 and SiCL4, and nitrogen sources is Ammonia or nitrogen etc. Pyrolysis reaction common can be conducted above 1000℃, and time is long ,need 1 hours or 10 hours,but this method can get the higher purity and the smaller particles.
- Heat nitriding method.Heat nitriding method is put silicon powder into nitorgen to carry out oxidation reaction and get silicon nitride powder. Compare with the Pyrolysis method, Heat nitriding method has Faster reaction speed, low reation temperaturer, and produce Same particles and diameter silicon nitride in lower time. but this method need use High pressure nitrogen reactor, High equipment cost.
- plasma method. This method is put the silicon resouces and nitrogen resources into plasma reactor, Method for generating silicon nitride powder by nitridation reaction under the action of high energy ion beam. This method powder particles and diameter can be controled, fast response, high purity, usually uese as produce high purity , high accuracy nitride silicon micron powder.
Above all is common production methods of the silicon nitride powder.
Different countries has different production methods , it mian accroding to the national economic and technological development. Zhenxin Metallurgy have Advanced nitrogen production equipment: 4 sets of production lines for Nitrided ferroalloy of 20,000 TPY; 4 sets of production lines for Alloy cored wire of 30,000 TPY; 6 sets of vacuum furnaces; 10+ sets furnaces for other purposes. so we can supply high quality silicon nitride lump ,powder and others shape.
