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Silicon nitride ceramic is a new material technology application of mechanical seals for pumps. Many domestic mechanical seals manufacturers now use graphite, alumina ceramics, cemented carbide, stainless steel and polytetrafluoroethylene. The wear resistance, corrosion resistance and vibration resistance of these materials are not as good as silicon nitride ceramics, so it is an ideal mechanical seals ring material. For example, for hydrochloric acid pumps and ferric chloride pumps in chemical plants, if silicon nitride ceramics are used to replace general acid resistant ceramics and graphite as mechanical seals rings, the service time can be increased several times. The mechanical seals of submersible pumps for rural drainage and irrigation is to prevent water from entering and burning out the motor. Moreover, the working environment of this pump is full of sediment, so the wear resistance of the sealing ring is required to be good. In addition, marine pumps are often parked in ports with heavy sediment, which also requires the corrosion and wear resistance of the mechanical sealing ring of the pump. If silicon nitride ceramic is used instead of graphite as sealing ring, the working life can be greatly improved.
The use of silicon nitride ceramics as valves and ball valves has also revealed its edge in the chemical industry Most valves used in chemical plants work in highly corrosive media, and sometimes need to withstand high temperature and high pressure In the past, the service life of ball valves made of cast iron or alloy was short. If silicon nitride ceramic ball valves were used, the situation would change, and their service life could be increased by more than 100 times.
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