Patent ID: 10883166

Abstract:
The present invention is directed to a surface-coated cubic boron nitride sintered material tool including a cBN substrate and a hard coating layer formed on a surface of the cBN substrate and having an alternate laminated structure of A layer and B layer. The cBN substrate (sintered material) includes: a Ti compound, WC, AlN, TiB2, Al2O3, and cBN. The A layer has a composition of (Ti1-xAlx)N (0.4≤x≤0.7 in terms of atomic ratio). The B layer has a composition of (Cr1-y-zAlyMz)N (0.03≤y≤0.4 and 0≤z≤0.05 in terms of atomic ratio). A plastic deformation work ratio of the B layer is 0.35 to 0.50.