How to smelt black silicon carbide ?
Black silicon carbide high temperature smelting sintering method commonly known as: buried powder firing. It is a current that heating begins, the core temperature of about 2500℃, or even higher (2600 ~ 2700℃), the charge reached 1450℃ when the synthesis of SiC (but SiC is mainly formed at ≥1800℃), and release CO. However, SiC will decompose when the temperature is higher than 2600℃, but the decomposed si will form SiC with C in the charge. Each group of electric furnace is equipped with a group of transformers, but the production of only a single electric furnace power supply, in order to adjust the voltage according to the electric load characteristics to basically maintain constant power, high power furnace to heat about 24h, after the power failure to generate SiC reaction basically ended, after a period of cooling can be removed side wall, and then gradually take out the charge. The preparation of black silicon carbide is mainly carried out by smelting quartz and stone tar under high temperature conditions, so the demand for temperature is higher, if the temperature does not meet the demand will produce impurities, so enterprises should master this technology.