... with quartz sand, petroleum coke (or char), production (green silicon chips to add salt) raw materials in internal resistance furnace ... . At present the industrial production of green silicon carbide into black carbide and silicon carbide, two six-party crystals, weight for ... 3.25, microhardness 3.20 ~ 2840-3320kg/was for.this silicon ring beloings to Application of carbide sintering.have high density ...