Green silicon carbide (SiC) is an important inorganic material with many excellent properties, such as high melting point, high hardness, high thermal conductivity and corrosion resistance. It is usually prepared by reacting a carbon source with silicon dioxide (SiO2). The following is the common production process of green silicon carbide:
Carbon source screening: Charcoal, graphite or graphite powder is usually used as the carbon source. These raw materials need to be carefully processed and screened to ensure that their purity and particle size meet the requirements.
Mixing: Mix the selected carbon source and silica evenly in a certain proportion. The purpose of mixing is to provide sufficient carbon source to produce green silicon carbide during the subsequent reaction.
Forming: The mixture is pressed into blocks or granules, usually using a press or mold to facilitate subsequent heat treatment.
Heat treatment: Place the formed mixture in a high-temperature furnace for heat treatment. At high temperatures, the carbon source reacts with silica to form char. It is usually necessary to control the atmosphere and temperature to promote the reaction.
Pyrolysis: The heat-treated product needs to be pyrolyzed, that is, residual oxidized substances are removed at high temperatures to further enhance the purity and density of the product.
Shaping and processing: Green silicon carbide products usually need to be shaped and processed after heat treatment to obtain the desired shape and size.
It should be noted that the above is only the basic process flow for the preparation of green silicon carbide. Actual production may involve many specific process parameters, equipment and control conditions. Different manufacturers may have their own patented processes and technical secrets. If you need more detailed information, it is recommended to consult the relevant manufacturers or scientific research institutions.