Among them, reaction sintering is a commonly used method for producing silicon nitride refractory products. The reaction sintering method produces silicon nitride products by molding finely ground silicon powder by machine pressing or isostatic pressing. After the green body is dried, it is heated to 1350~1400 degree in nitrogen and is nitrided simultaneously during the sintering process. have to.

Using this production method, the raw material conditions, firing process and atmosphere conditions have a great impact on the performance of the products. Atmospheric pressure sintered silicon nitride is a product made by mixing synthetic silicon nitride powder and sintering aids evenly, then shaping, drying, and sintering at 1700 to 1800 degree in a normal pressure nitrogen atmosphere.