"Siliconitride ceramics" is made of silicon powder as raw materials, which are respectively processed by reaction sintering and hot pressing. In the first method, the silicon powder is first made into a desired green body, and then it is initially nitrided with nitrogen at a high temperature of 1200 °C. The preliminary nitrided blank is subjected to a trimming process and then subjected to a second nitriding at a high temperature of 1350-1450 ° C to produce a silicon nitride ceramic. This method is called reaction sintering silicon nitride. The ceramic device produced by this method has a characteristic that it does not shrink and has high precision. The second method is to first nitrite silicon powder into silicon nitride powder, add a small amount of magnesium oxide, place it in a mold, and apply two or three hundred atmospheric pressure hot pressing at a high temperature of 1700-1800 °C. . The latter is a dense ceramic with a porosity close to zero, while the former contains more pores.

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