Abrasives and Bonded Abrasives• Abrasives that are commonly used:1. Conventional abrasives (普通磨粒)-氧化鋁、SiC2. Superabrasives(超級磨粒)-CBN、Diamond• Above abrasives are harder than conventional cuttingtool materials• Cubic boron nitride (CBN) and diamond are the two hardest materials known;referred to as superabrasives• Friability (易脆性) defined as the ability of abrasive grains to fracture into smaller pieces -磨粒自動磨銳-形狀及大小也會引響易脆性