| 摘要 |
A cutting tool insert with a cemented carbide and a coating. The cemented carbide substrate includes WC, 7 to 12 wt-% Co, 5 to 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 to 1.4 mum. The coating includes at least one 2 to 12 mum thick alpha-Al<SUB>2</SUB>O<SUB>3 </SUB>layer composed of columnar grains with texture coefficients: TC(012)>2.2 and TC(024)>0.6xTC(012).
|
