Patent ID: 7794860

Claim:
A surface-coated high hardness material for tool comprising: a substrate made of a cubic boron nitride sintered compact (CBN sintered compact, hereinafter), and at least one coating film layer formed on the surface of the substrate, wherein the thickness of the coating film layer ranges from 0.1 μm or more to less than 1 μm, wherein the composition of the coating film is expressed by (Ti 1-x Al x )N, 0.3≦X≦0.6, and wherein a relation of 0≦I(200)/I(111)≦3 is established when diffraction strength of (111) plane in X-ray diffraction of the coating film is I(111) and diffraction strength of (200) plane is I(200), and wherein average grain diameter of crystal constituting the coating film is from 50 nm to less than 150 nm.