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

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool with a hard coating layer exerting excellent chipping resistance and wear resistance in heavy cutting work of a material to be cut having high welding performance.;SOLUTION: On a surface of a tool base comprising tungsten carbide group cemented carbide or titanium carbon nitride group cermet, a complex nitride layer of Al, Ti, and Si represented by a composition formula: (Al_αTi_{1-(α+β)}Si_β)N (wherein 0.50≤α≤0.65, 0.01≤β≤0.10 in an atomic ratio) is formed as (a) a lower layer by vapor deposition, a complex oxide layer of Al and Si represented by a composition formula: (Al_1-YSi_Y)₂O₃ (wherein 0.01≤Y≤0.3 in an atomic ratio) is formed as (b) an intermediate layer by the vapor deposition, a composition tilting type complex oxide layer of Al and Si represented by a composition formula: (Al_1-YSi_Y)_1-XO_X (wherein 0≤X≤0.1, 0.01≤Y≤0.3 in an atomic ratio) is formed as (c) a upper layer by the vapor deposition, wherein an O (oxygen) content proportion of the upper layer reduces from the intermediate layer side toward the upper layer surface.;COPYRIGHT: (C)2010,JPO&INPIT