| 摘要 |
The present invention relates to a cutting tool insert of a cemented carbide and a coating. The cemented carbide substrate comprises WC, 7-12 wt-% Co, 5-11 wt-% cubic carbides of metals from the groups IVb, Vb and VIb with a binder phase that is highly alloyed with cobalt. The tungsten carbide phase has a mean intercept length of 0.7 - 1.4 µm. The coating comprises at least one 2-12 µm thick ±-Al 2 O 3 layer composed of columnar grains with texture coefficients, TC(012) >2.2 and TC(104), TC(110), TC(113), TC(116) all <0.4. |
