Sintering Manufacture Process Research on Special Ceramics Fe-Si_3N_4 Bonded SiC

摘要

By the method of TG-DSC (thermo gravimetric analysis -differential scanning calorimeter), the chemical reactions of Fe-Si_3N_4 bonded SiC during the sintering process in nitriding furnace have been studied. Analyses have been conducted on the reason of disintegration of specimens when ferro-silicon was added greater than 15 percent and on the method to reduce damage. The result indicated that there are mainly three important reactions occurred during the nitriding process of samples, they are: the oxidation of carbon, the melting of ferro-silicon and the nitriding of ferro-silicon. Controlling the balance of partial pressure of N_2 and slowing down the rate of temperature rising can reduce the disintegration of samples.