Carbon source screening: charcoal, graphite or graphite powder are usually used as carbon sources. These raw materials need to be carefully processed and screened to ensure their purity and particle size meet the requirements.
Mixing: the selected carbon source and silicon dioxide are evenly mixed according to a certain proportion. The purpose of mixing is to provide enough carbon source for the production of green silicon carbide in the subsequent reaction process.
Molding: the mixture is pressed into blocks or granules, and the subsequent heat treatment is usually carried out by a press or mold.
Heat treatment: the formed mixture is put into a high-temperature furnace for heat treatment. At high temperature, the carbon source reacts with silicon dioxide to generate carbonized substances. It is usually necessary to control the atmosphere and temperature to promote the reaction.
Pyrolysis: the products after heat treatment need to be pyrolyzed, that is, the residual oxidized substances are removed at high temperature to further enhance the purity and compactness of the products.
Molding: green silicon carbide products usually need to be shaped after heat treatment to obtain the required shape and size.
It should be noted that the above is only the basic process flow of green silicon carbide preparation, and many specific process parameters, equipment and control conditions may be involved in actual production. Different manufacturers may have their own patented processes and technical secrets. If more detailed information is needed, it is recommended to consult relevant manufacturers or scientific research institutions.