MICROSTRUCTURE EVOLUTION OF α-SiC IN THE LIQUID PHASE SINTERING PROCESS

摘要

Silicon carbide (SiC) ceramics are important structural material because of its corrosion and abrasion resistance, high strength and hardness. However, SiC ceramic is difficult to densify due to the Si-C nature. Liquid phase sintering seems to be the most promising way to fabricate SiC ceramic. And Al_2O_3-Y_2O_3 is the most effective aid, which forms Yttrium aluminum garnet (YAG) during sintering process. In the paper, the densification process of a-SiC ceramic using Al_2O_3-Y_2O_3 as additives was studied. The terminal sintering temperatures were designed from 1650 °C to 1950 °C with every 100 °C interval to capture the densification process. The microstructure of SiC ceramics is evaluated and classical sintering theory is testified.