Seal with a green silicon carbide powder

Seal manufacturers in the production of silicon carbide seals, 98% have joined the green silicon carbide powder as a filler. Produced silicon carbide mechanical seal ring with a light weight, low thermal expansion coefficient, high hardness, high temperature strength, at very high temperatures good dimensional resistance, corrosion resistance and high modulus of elasticity, long life and other characteristics . It can be used for radioactive, corrosive, toxic, flammable, explosive, high temperature, and many other complex working conditions. Suitable for petroleum, chemical pumps and rotary machinery use. State of the art silicon carbide mechanical seal silicon carbide seal ring is now more widely used abroad, is widely used in pumps, chemical, nuclear submarines, nuclear and aerospace industries, but China's large-sized sealing ring still rely on imports. Silicon carbide products production are mostly used hot or reaction sintering process for the production of high quality hot products, but the high cost and limited size, can only do some simple shapes of products. Reaction sintering cost is relatively low point, but there is always a residual silicon products exist. Making quality products is not high. In contrast, non-pressure sintering (or atmospheric sintering) method were the lowest-cost SiC products, moderate quality, can produce complex shape, size large variety of products, is the most promising approach commercialization, domestic and foreign companies are looking for products. Silicon carbide products developed rapidly abroad. Our development is slow, but mainly hot and reaction sintering products. SiC products is the dominant product SiC mechanical seal ring, extrusion, wire drawing dies. Sealing ring has started, silicon carbide extrusion die and drawing die are also being developed and trial. Pressureless sintering process for producing silicon carbide, due to lower costs, the occupation of the seal ring market is absolutely sure. Major domestic silicon carbide seal technology is now mainstream domestic manufacturing silicon carbide seal technologies include: reaction sintering (self-binding) method, silicon carbide, atmospheric sintering (pressureless sintering) method of silicon carbide and silicon carbide carbon add 5-30% can be controlled porosity of silicon carbide. Performance silicon carbide ceramic material vary with different preparation process will be some changes, compared with tungsten carbide, silicon carbide low density, corrosion resistance and thermal properties, low friction coefficient, has obvious advantages in mechanical seal material .