Influence of Adding beta -SiC on the Performance of alpha -SiC Pressureless Sintering Ceramics

beta The B sub(4)C and phenolic resin were used as sintering additives to study the different beta -SiC (cubic silicon carbide) addition to the performance of alpha -SiC pressureless sintering ceramics in this paper, and the optimum sintering temperature and the best beta -SiC addition amount were determined. By XRD, SEM, density testing and other tests showed that, all the beta -SiC transform 6H alpha -SiC during the sintering process, the ceramics have a Vickers hardness of 18.04 GPa, a frature toughness of 4.51MPa, a density of 3.13g/cm super(3) by adding 15wt% beta -SiC powders.