Patent ID: RE44870

Claim:
A body at least partially coated with one or more refractory layers of which at least one layer is alumina, said alumina layer having a thickness d of 0.5 μm≦d≦25 μm with a grain size (s) of 0.5 μm<s<4 μm; said alumina layer consisting of single phase α-structure textured in the (104)-direction with a texture coefficient larger than 1.5 2.5 , the texture coefficient (TC) being defined by calculation: TC ⁡ ( hkl ) = I ⁡ ( hkl ) I 0 ⁡ ( hkl ) ⁢ { 1 n ⁢ ∑ I ⁡ ( hkl ) I 0 ⁡ ( hkl ) } - 1 where I(hkl)=measured intensity of the (hkl) reflection I o (hkl)=standard intensity of the ASTM standard powder pattern diffraction data n=number of reflections used in the calculation and (hkl) reflections used are: (012), (104), (110), (113), (024), (116), said alumina layer being an exposed outermost layer in contact with a TiC x N y O z -layer.