Porous ultrafine grinder

摘要

The present invention provides a porous ultrafine grinder including ultrafine abrasive grains of diamond or cubic boron nitride having an average grain size of 60 mu m or less, and a binder which can form a fused phase by fusion with the ultrafine abrasive grains under heating. The binder is a porous material having continuous pores, and the fused phase formed in the interface of the binder and the ultrafine abrasive grains has a thickness of 1.5 mu m or less.