METHOD OF PRODUCING COMPOSITE MATERIAL FORMED BY COMPOSITE OF MATRIX METAL AND SOLID-PHASE FINE PARTICLES, AND METAL BONDED GRINDING WHEEL PRODUCED BY THE SAME

摘要

PROBLEM TO BE SOLVED: To solve such a problem that the distribution of grinding particles of a metal bonded grinding wheel to be produced by a centrifugal-force mixing powder method is difficult to be controlled due to fluidity or the like.SOLUTION: Matrix metal powder and solid-phase fine-particle powder are mixed together to make mixed powder, and after the mixed powder is put into a casting mold, centrifugal force is applied to the casting mold and base-material melted metal produced by a melting furnace for casting is put into the casting mold, to produce a composite material wherein the matrix metal and solid-phase fine particles form a composite. During the production, the temperature of base-material molten metal produced by the melting furnace for casting is determined on the basis of apparent thermal conductivity of the mixed powder so that the matrix metal in the mixed powder is melted and the moving speed of the solid-phase fine particles by the centrifugal force becomes low. In addition, when the solid-phase particles are ununiformly dispersed even at the melting temperature determined on the basis of the thermal conductivity, ununiform dispersion can be improved by reducing the dimension of solid-phase particles.