ABRASIVE GRAIN AND METHOD FOR PRODUCING IT, POLISHING TOOL AND METHOD FOR PRODUCING IT, GRINDING WHEEL AND METHOD FOR PRODUCING IT, AND POLISHING APPARATUS

摘要

An abrasive grain including a porous particle material in which a large number of secondary particles contain gaps between primary particles bonded to each other. The secondary particles are produced by growing primary particles into secondary particles, which are formed by cohesion of a large number of primary particles, via a heat treatment at a temperature sufficient to form necks at bonding points between the primary particles.