What are the commonly used materials for mechanical seals?

Commonly used materials for mechanical seals include tungsten carbide, ceramics, graphite, silicon carbon, cemented carbide, etc.

1. Tungsten carbide

Tungsten carbide is a hard material with very high hardness and good wear resistance. In high-speed rotating mechanical equipment, if high-speed rotating sealing is required, tungsten carbide mechanical seals are usually chosen. The sealing performance of tungsten carbide seals is also very good, but because it is more expensive, the cost is also relatively high.

2. Ceramics

Ceramic mechanical seal is a common form of mechanical seal with wide range of uses and long service life. The sealing performance and wear resistance of ceramic seals are very good, especially under high temperature and high pressure, they can still maintain good performance. However, compared with other materials, ceramic materials are weaker and prone to cracks.