| 摘要 |
The present invention relates to a cutting tool insert comprising a cemented carbide body and a coating particularly useful in fine to medium-rough turning of stainless-steels. The cemented carbide body consists of a cemented carbide with a composition of 5.0-9.0 wt-% Co, 5.0-11.0 wt-% cubic carbide forming metals from group IVb, Vb and VIb of the periodic table, preferably Ti, Nb and Ta, and balance WC with a 10-30 μm essentially cubic carbide phase free and binder phase enriched surface zone. The coating comprises an MTCVD Ti(C7N) as the first layer adjacent the body having a thickness of from 2.5 to 7.0 μm, on top of which an α-Al2O3 layer is present, with a thickness of between 2.0 and 5.0 μm, and a total thickness of the coating between 5.5 and 9.5 μm. The alumina layer has a (006) texture. |
