Why Carbon Silicon Carbide (SiC) Seals Are Used in High‑Speed Rotary Unions

The silicon carbide ring is produced by high‑temperature sintering, and its sealing face is ground with diamond to a mirror finish. It features high hardness, excellent heat resistance, and strong wear resistance. When the silicon carbide ring works together with a graphite friction seal, the powdered nature of the graphite creates a sealing film effect, making it very difficult for contaminants to enter the sealing faces. This is precisely why a rotary union with a silicon carbide seal does not leak even at high speeds.

It is essential to use a silicon carbide ring for sealing high‑speed rotary unions. Otherwise, not only will the service life of the rotary union be reduced, but the equipment may also fail to operate properly, which can significantly disrupt normal production schedules. Even though this may seem like a small and simple issue, improper handling of the seal material can still impede production progress.

Ruitus Mechanical Technology specializes in manufacturing rotary joints, hydraulic rotary joints, rotating rotary joints, and high-temperature rotary joints, etc.