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What are the characteristics of Nitride bonded Silicon Carbide?
- Nov 03, 2018 -

For silicon nitride bonded silicon carbide wear-resistant products, its characteristics mainly represent many aspects. One is good thermal shock resistance and high temperature creep resistance. Because silicon carbide has good thermal conductivity, and silicon nitride has a low thermal expansion rate, and the two are effectively combined to form a silicon nitride bonded silicon carbide product, the material has good thermal shock resistance.


If the size is kept constant during the hot and cold cycle, when the temperature is cooled from 1300 ° C to 20 ° C, it takes hundreds of heating cycles, but this will not damage the material and effectively shorten the firing cycle. In addition, in the manufacturing process of silicon nitride bonded silicon carbide wear-resistant materials, the dimensional change is less than 1%, and due to the lack of the glass phase, the material does not substantially deform under high temperature conditions, so the waste and the product are deformed. The situation will not happen.


At the same time, Nitride bonded Silicon Carbide also have good oxidation resistance, wear resistance and corrosion resistance. The microhardness of silicon carbide and silicon nitride is relatively small compared to materials such as boron carbide, cubic boron nitride, and diamond, and silicon nitride has a small coefficient of friction and good self-lubricity.


Therefore, the silicon nitride-bonded silicon carbide composite has good chemical properties, can withstand most of the lye corrosion and inorganic acid corrosion, has good oxidation resistance, and is effective against the wetting of molten aluminum and aluminum alloy melts. Corrosion of non-ferrous metals, good insulation at high temperature points.


In addition, Nitride bonded Silicon Carbide have a strong flexural strength. Compared with clay silicon carbide products, silicon nitride combined with silicon carbide wear resistant materials have stronger flexural strength and twice the room temperature flexural strength of clay silicon carbide products. If the amorphous phase is not included, the room temperature is maintained in the range of 1200 ° C to 1400 ° C, and the strength of the wear resistant material is further increased to 9 times that of the clay silicon carbide product.