The surface canning cutting tool null tungsten carbide basis which shows resistance blade tipping Characteristic and the abrasion resistance where high speed heavily the hard enveloping layer is superior

摘要

PROBLEM TO BE SOLVED: To provide a surface-coating cutting tool with a hard coating layer exerting an excellent chipping resistance and wear resistance in high-speed heavy cutting machining.;SOLUTION: On a tool base surface, (a) as a lower layer, a compound nitride layer of Al and Cr (and Si) expressed by a composition formula : (Al_1-αCr_α)N or (Al_{l-α-β}Cr_αSi_β)N, (b) as an intermediate layer, a compound oxide layer of Al and Cr (and Si) expressed by a composition formula : (Al_l-YCr_Y)₂0₃ or (Al_1-Y-ZCr_YSi_Z)₂O₃, and (c) as an upper layer, a compound oxide layer of a composition inclination type of Al and Cr (and Si) expressed by a composition formula : (Al_l-YCr_Y)_1-XO_X or (Al_1-Y-ZCr_YSi_Z)_1-XO_X, and wherein an O (oxygen) containing ratio is decreased from the intermediate layer side toward the surface of the upper layer, are vapor deposition formed. Here, 0.25≤α≤0.45, 0.01≤β≤0.10, 0X≤0.2, 0.25≤Y≤0.55, and 0.01≤Z≤0.10(each of α, β, X, Y, Z is an atomic ratio).;COPYRIGHT: (C)2011,JPO&INPIT