Sintered of silicon carbide owing to its advantages: Wear, corrosion resistance, high hardness, low density and high temperature strength, therefore the past decade, in the people's livelihood in various fields has been increasingly widely used. In aerospace, nuclear industry, petroleum industry, chemical industry, textile industry, food industry that require high-temperature, high-speed, corrosion-resistant, vacuum, electrical insulation, non-magnetic, dry friction, under special circumstances, as a new type of ceramic material its indispensable role of being an alternative There is a growing recognition, has been widely used.