Texture-hardened alpha-alumina coated tool

Details Texture-hardened alpha-alumina coated tool Texture-hardened alpha-alumina coated tool

2011-04-12

2011-04-12

Turner, Archene (Department: 1784)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C051S307000, C051S309000, C428S325000, C428S336000, C428S472000, C428S697000, C428S698000, C428S699000, C428S701000, C428S702000

Reexamination Certificate

active

07923101

ABSTRACT:
The present invention relates to a coated cutting tool insert and a texture-hardened α-Al2O3layer to be used in metal machining. The alumina layer is characterized by the improved toughness and it adheres to the substrate covering all functional parts thereof. The coating is composed of one or more refractory layers of which at least one layer is a texture-hardened α-Al2O3having a thickness ranging from 2 to 20 μm being composed of columnar grains with a length/width ratio of 2 to 12. The α-Al2O3exhibits a strong (0006) diffraction peak. The improved wear resistance and toughness can be obtained when the texture coefficient (TC) for the (0006) reflection is larger than 1.33 ln h+2, where h is the α-Al2O3layer thickness and when the surface of the α-Al2O3layer is wet-blasted to an Ra-value <1 μm. The alumina layer with a strong (0001) texture is applied on Binder phase enriched cemented carbide substrates. This combination contributes to enhanced wear resistance and toughness.

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