Investigation of the indenter penetration zone in the wear particle of the matrix of a diamond-containing rock-cutting tool
摘要
The zone of interaction of the rock stiffening element with the surface of the matrix material Ni (94%)–Sn (6%) of the rock-cutting tool, equipped with diamonds of grain size 500/400 and their relative concentration of 100%, in the wear particle of the matrix material is considered. In the zone of indenter penetration in this wear particle, a system of microcracks originating at the place of direct contact of the indenter with the surface of the matrix and branches in the direction of indenter penetration into the matrix surface was found. The material of the matrix wears out brittle and one of the methods of microindentation of the brittle diamond-containing matrix surface under dynamic loading is “micro-impacts” of the rock stiffening elements on its surface with the subsequent delamination of discrete particles, the projection of which is similar to the projection of “swallow tail”.