SURFACE COATED SUPER HARD ALLOY CUTTING TOOL HAVING EXCELLENT RESISTANCE TO BREAKING OFF

摘要

PROBLEM TO BE SOLVED: To provide a surface coated super hard alloy cutting tool having excellent resistance to breaking off. SOLUTION: A surface coated super hard alloy cutting tool is provided by chemically and/or physically depositing a hard coating layer comprising a compound layer of an Al2 O3 mainly consisting of Al2 O3 on the surface of a WC group super hard alloy having a average layer thickness of 3 to 20μm, the compound layer of the Al2 O3 type containing, by weight, 1.5 to 15% of Ti, 0.005 to 0.1% of Cl and 0.001 to 0.1% of N.