Mechanical seal is an axial end face sealing device that relies on elastic elements to pre tighten the sealing pair, and under the joint action of medium and elastic element pressure, the sealing pair is compressed to achieve sealing. Its structure is shown in Figure 1. Sealing rings are divided into two types: moving rings and stationary rings, and are the most important components that make up mechanical seals.

Two methods of silicon carbide ring sintering, namely pressureless sintering and reaction sintering, were adopted. Silicon carbide products with different sintering methods have different physical and chemical properties, and the comprehensive performance of pressureless sintered silicon carbide is better than that of reaction sintered silicon carbide.