SiC Mechanical Seals

Mechanical seals are ubiquitous in industrial manufacturing, spanning fields such as petrochemicals, chemical fibers, fertilizers, nuclear energy, aerospace, and machinery manufacturing. With the rapid development of modern science and technology, equipment operating conditions are becoming increasingly complex, placing higher demands on mechanical seals.

When used for fluid sealing, the chemicals in the fluid medium can erode and corrode the seal, causing functional degradation and even failure. 80%–95% of mechanical seal leaks are caused by the sealing face; therefore, the selection of the mechanical seal's auxiliary materials is crucial.

Most mechanical seals use hard alloys, stainless steel, titanium alloys, ceramics, etc., as the hard ring material. To ensure the normal operation of the sealing ring in a mechanical seal device, considering factors such as friction reduction, corrosion resistance, and prevention of seizing, the sealing ring is often configured as a pair of hard and soft rings (dynamic and stationary rings) with different hardnesses. The hard ring material has the following performance requirements:

a. Sufficient strength and stiffness. It should not damage the ring under operating conditions (such as pressure, temperature, and sliding speed), deformation should be minimized, and it should maintain sealing performance even under fluctuating operating conditions.

b. Good tribological properties. During operation, the end faces of the sealing rings are always in contact and rotating. Therefore, the sealing ring material must have good wear resistance and maintain good boundary lubrication with the fluid to ensure a satisfactory service life under operating conditions.

c. Good thermal conductivity, heat resistance, and thermal shock resistance. During operation, the sealing rings are typically exposed to high temperatures and experience rapid temperature changes. This requires the material to have a high thermal conductivity and a low coefficient of linear expansion, and to not crack under thermal shock.

d. Good corrosion resistance. Sealing rings with good corrosion resistance can resist fluid corrosion and corrosive wear, resulting in a long service life.

In addition to the above properties, hard rings should also have good formability and machinability, low density and low permeability, and good self-lubricating properties.

Semicorex supplies high-quality customized SiC seals. Our products are engineered to deliver superior thermal stability, extended service life, and exceptional process consistency. For customized solutions or additional technical information, please feel free to contact our engineering team.

Phone: +86-13567891907

Email: sales@semicorex.com