How is the light transmittance of SIC

Light transmittance in general, belongs to dark green, through the stem Jitun ken of the stall to consult the lack of ink, mainly to do led, high-performance LEDs are made of silicon carbide, more expensive than alumina. Ordinary silicon carbide is a black silicon, green silicon and cubic silicon carbide (grass).

Their purity is lower than the electronic grade, so they do not have light transmittance. Silicon carbide (sic) is made of quartz sand, petroleum coke (or char), sawdust as raw material through resistance furnace high temperature smelting.

Silicon carbide is also found in the rare mineral-maussans stone of nature. Sic is also called gold steel sand or refractory sand. Silicon carbide is a quartz sand, petroleum coke (or char), sawdust (production of green silicon carbide need to add salt) and other raw materials in the resistance furnace by high-temperature smelting.

At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide two, are six square crystals, the specific gravity of 3.20~3.25, micro-hardness of 2840~3320kg/mm2. including black silicon carbide and green silicon carbide, wherein: black silicon carbide is a quartz sand, petroleum coke and high-quality silica as the main raw material, through the resistance furnace high temperature smelting. Its hardness is between corundum and diamond, mechanical strength is higher than corundum, brittle and sharp. Green Silicon carbide is based on petroleum coke and high-quality silica as the main raw materials, adding salt as an additive, through the resistance furnace high temperature smelting. The hardness is between corundum and diamond, and the mechanical strength is higher than that of corundum. Commonly used sic abrasives have two different crystals, one is green silicon carbide, containing more than 97% sic, mainly used to grind hard gold-containing tools. The other is black silicon carbide, metal luster, containing more than 95% sic, strength than green silicon carbide, but low hardness, mainly used for grinding cast iron and non-metallic materials.