Surface coated cemented carbide cutting tool having hard...

Details Surface coated cemented carbide cutting tool having hard... Surface coated cemented carbide cutting tool having hard...

2006-12-19

2006-12-19

Turner, Archene (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C051S307000, C051S309000, C428S216000, C428S336000, C428S697000, C428S699000, C407S119000

Reexamination Certificate

active

07150925

ABSTRACT:
The invention provides a coated cutting tool made of cemented carbide in which a hard coating layer has excellent wear resistance in high-speed cutting operation, wherein (a) a crystal orientation hysteresis layer which consists of a carbonitride compound layer and (b) a hard coating layer which consists of a layer of nitride compound and has a well defined crystal orientation and/or degree of crystallinity are formed on the surface of a cemented carbide substrate, preferably on the surface of a tungsten carbide based cemented carbide or titanium carbonitride based cermet by physical vapor deposition, wherein the crystal orientation hysteresis layer is deposited between the surface of a cemented carbide substrate and the hard coating layer. In one specific example, (a1) the carbonitride compound layer has an average thickness of 0.05 to 0.5 μm and is preferably a Ti—Al carbonitride compound layer expressed by the composition formula as (Ti1−XAlX)(N1−YCY), wherein X ranges from 0.05 to 0.20 and Y ranges from 0.01 to 0.15 by atomic ratio and (b1) the nitride compound layer has an average thickness of 2 to 15 μm and is preferably a Ti—Al nitride compound layer expressed by the composition formula as (Ti1−ZAlZ)N, wherein Z ranges from 0.45 to 0.65 by atomic ratio. In another specific example, (a2) the carbonitride compound layer has an average thickness of 0.05 to 0.5 μm and is preferably a Ti—Al carbonitride compound layer expressed by the composition formula as (Ti1−XAlX)(N1−YCY), wherein X ranges from 0.01 to 0.15 and Y ranges from 0.01 to 0.15 by atomic ratio and (b2) the nitride compound layer has an average thickness of 2 to 10 μm and is preferably a Al—Ti—Si nitride compound layer expressed by the composition formula as (Al1−(A+B)TiASiB)N, wherein A ranges from 0.35 to 0.55 and B ranges from 0.05 to 0.20 by atomic ratio.

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