Effect of wSiC and wSi3N4 Whiskers on the Ultimate Dynamic Tensile Strength of cBN Composites from the BL Group

The effect of wSiC and wSi3N4 whiskers on the ultimate dynamic tensile strength $$R_{{\text{m}}}^{{\text{d}}}$$ of superhard BL group cBN composites synthesized in the cBN–NbN–Al and cBN–NbN–Al2O3 systems is considered. It is demonstrated that $$R_{{\text{m}}}^{{\text{d}}}$$ is ranged from 182 to 333 MPa and depends on the character of a filler. It is pointed out that the addition of wSiC whiskers to the initial sintering mixture increases $$R_{{\text{m}}}^{{\text{d}}}$$ of sintered ceramic averagingly by 10–15% and, at the same time, the presence of Al2O3 leads to a slight decrease in the material strength.