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

Abstract

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.