Patent ID: 8211555
Filing Date: 2012-07-03
Classification: C23C,Y10T

Abstract:
1. A cutting tool insert comprising a cemented carbide body and a coating for medium-rough to rough turning of stainless-steels and superalloys; wherein said cemented carbide body comprises 7.0-11.0 wt-% Co, 5.0-11.0 wt-% cubic carbide forming metals selected from groups IVb, Vb and VIb of the periodic table and balance WC, and with a weight-ratio of Ta and Nb, when present, between 1.0-3.0, and between Ti and Nb, when present, within 0.5-1.5, and with a coercivity (Hc) of 9.0-14.0 kA/m, whereby the cemented carbide is provided with a 10-30 μm, essentially cubic carbide phase free and binder phase enriched surface zone with an average binder phase content in a range 1.2-2.5 times a nominal binder phase content, and wherein said coating comprises a MTCVD Ti(C,N) as a first layer adjacent the body having a thickness of from 2.5 to 7.0 μm, where the MTCVD-layer comprises an innermost TiN layer adjacent to the body with a Ti(C,N) layer on top, optionally with an additional intermediate TiN layer on top of the Ti(C,N) layer, with a thickness of 0.3-1.0 μm, on top of which an α-Al where