Silicon carbide is a highly inert material and is made from grains of carbon-rich asymptotic giant branch stars. It can be used for various applications, including the production of lasers, solar cells, and thermal insulators. The highest purity is available in pale green or pale yellow crystals, which are located closest to the graphite resistor. Darker crystals are less pure, and they usually contain aluminium, iron, or ferr, which decreases the electrical conductivity.
Thermal decomposition of a polymer containing pure green silicon carbide powder can produce a more pure form of silicon carbide. The process can be done in several ways. It may use a reactive or self-bonding technique or it may utilize a boron carbide carbon source. Both methods use high temperatures to reduce residual silicon and promote mass transfer.
Thermal decomposition of a polymer may be a simple, one-step process. It involves introducing vaporized polysiloxane into a reaction chamber, heating the reaction to approximately 1600 degrees C, and inducing the reaction for a sufficient period of time to yield silicon carbide powder. The silicon carbide powder is then collected.
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