| 摘要 |
PURPOSE: To provide a cutting tool insert having superior performance in milling of stainless steel and superalloy and milling of steel in applications requiring toughness by comprising cemented carbide body, W-alloy Co binder phase, and a coating comprising the innermost layer of TiCxNyOz with equiaxed structure, TiCxNyOz layer with columnar structure andα-Al2O3 layer, and provide a manufacturing method thereof. CONSTITUTION: The cutting tool insert comprises a cemented carbide body, and a coating, wherein the cemented carbide body has a composition comprising 11.3 to 12.7 wt.%, preferably 11.5 to 12.5 wt.%, most preferably 11.8 to 12.4 wt.% of Co; 0.5 to 2.5 wt.%, preferably 0.7 to 1.9 wt.%, most preferably 1.0 to 1.8 wt.% of the total amount of cubic carbide of Ti, Nb and Ta; and the balance of WC, a mean intercept length of WC grains being 0.3 to 0.8μm, preferably 0.4 to 0.8μm with a binder phase being alloyed with W corresponding to a S-value within a range of 0.81 to 0.95, preferably 0.82 to 0.94, and the coating comprises a first layer(the innermost layer) of TiCxNyOz having an equiaxed structure and the total thickness of less than 1μm, preferably exceeding 0.1μm with 0.7<=x+y+z<=1, preferably z<0.5, more preferably y>x and z<0.2, most preferably y>0.7; a TiCxNyOz layer having a columnar structure and thickness of 0.5 to 5μm, preferably 1 to 4μm, most preferably 1.5 to 3μm with 0.7<=x+y+z<=1, preferably z<0.2, x>0.3 and y>0.2, most preferably x>0.4; and an Al2O3 layer consisting ofαphase and having thickness of 0.2 to 5μm, preferably 0.5 to 4μm, most preferably 1 to 3μm. |
