What materials are suitable for mechanical seals?

1. Metal

Metal mechanical seals are suitable for sealing under harsh conditions such as high temperature, high pressure, and high speed. Common materials include stainless steel, tungsten carbide, titanium alloy, etc. Metal seals have the characteristics of wear resistance, corrosion resistance, high temperature resistance, and good sealing performance, but the cost is high and they are not suitable for low temperature environments.

2. Ceramics

Ceramic mechanical seals are suitable for sealing involving chemical substances because they are resistant to acid and alkali corrosion and wear. Commonly used ceramic materials include alumina, silicon nitride, silicon carbide, etc. However, because the ceramic material itself is fragile, it cannot withstand large impact and vibration forces.

3. Polytetrafluoroethylene

PTFE mechanical seal is suitable for general sealing. It has good chemical resistance, good self-lubrication and low friction coefficient. However, PTFE material is soft and cannot withstand high pressure and temperature.

In addition to the above materials, there are other materials suitable for mechanical seals, such as rubber, fluorine rubber, graphite, etc. When selecting mechanical seal materials, comprehensive considerations should be made based on the specific application environment and sealing requirements, and a suitable material should be selected.

In short, the material of the mechanical seal should be flexibly selected according to different application environments and evaluated based on its advantages and disadvantages to achieve the optimal sealing effect.