Influence of Adding β-SiС on the Performance of α-SiС Pressureless Sintering Ceramics

βThe B4C and phenolic resin were used as sintering additives to study the different β-SiC（cubic silicon carbide) addition to the performance of α-SiC pressureless sintering ceramics in this paper, and the optimum sintering temperature and the best β-SiC addition amount were determined. By XRD, SEM,density testing and other tests showed that, all the β-SiC transform 6Hα-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/cm3 by adding 15wt% β-SiC powders.