The synthesis of silicon carbide and main purpose

By the sand and the right amount of carbon in electric furnace heating. Figure XIV - 8 Lely furnace A - graphite tube; B - adiabatic area; C - graphite rod; D - graphite heater; E - single crystal growth of crucible; F - temperature measurement with observation seam; G - temperature window silica carbide reduction method of the average particle size of 0.01 microns 1 silica powder H&X Al2O3 powder and average particle size of 0.05 mu m 2 carbon powder and the average particle size of 0.1 mu m fine crystalline under beta 0.04 a mixed type of silicon carbide powder, and then into graphite containers, in the argon gas flow (flow: 2 L/min), at 1600 ℃ for 5 h reaction, then the reaction product in air, heat for 2 h at 700 ℃, to remove residual carbon, made beta type silicon carbide powder products. The equation is as follows: SiO2 + 2 + 3 csic co starting material of silicon carbide fiber is the boiling point is 70 ℃ liquid dimethyl dichlorosilane. With the function of sodium metal. In an inert organic solvent is higher than the boiling point of sodium, sodium was scattered, molten state in which dripped with dimethyl dichlorosilane, hydrochloric acid reaction at the same time generate poly silane. Will gather silane in inert atmosphere heated to above H&X Alumina Oxide, the heat transfer reaction and polymerization reaction, generate intermediate carbon silane. The melt spinning fiber. Get of carbon silane fiber in high temperature calcination process processing, bridging reaction because the oxygen in the air, often in a nitrogen atmosphere heat treatment, the temperature is 1200 ~ 1500 ℃ was high strength of silicon carbide fibers. Figure XIV - 9 A - hydrogen gas instead should be synthetic device entry; B - hydrogen purification device; C - meter; D - constant temperature bath; E - temperature measurement using prism; F - gas exports; G - quartz glass tube; H - base material; I - high frequency induction coil;