Patent ID: 7442431
Filing Date: 2008-10-28
Classification: C04B,C23C,C30B,Y10T

Abstract:
1. Cutting tool insert comprising a substrate at least partially coated with a coating with a total thickness of from about 10 to about 40 μm, of one or more refractory layers of which at least one layer is an alumina layer wherein said alumina layer is composed of columnar α-Al 2 O 3 grains with texture coefficients a) TC(110) greater than about 2.0; and b) TC(012), TC(104), TC(113), TC(024), TC(116) all less than about 1.5; wherein the texture coefficient TC(hkl) is defined as where I(hkl)=measured intensity of the (hkl) reflection I n=number of reflections used in the calculation (hkl) reflections used are: (012), (104), (110), (113), (024), (116).