US 6,183,846 B2Granted

Coated hard metal material

AssigneeSumitomo Electric Industries, Ltd.

InventorsHideki Moriguchi, Akihiko Ikegaya, Nobuyuki Kitagawa, Katsuya Uchino

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Abstract

A coated hard metal for a cutting tool is excellent in wear resistance and chipping resistance. The coated hard metal includes a hard coating layer on a surface of a base material of cemented carbide or cermet. The hard coating layer includes an inner layer (2) on the base material (1), an intermediate layer (3) on the inner layer (2) and an outer layer (4) on the intermediate layer (3). The inner layer (2) consists of a carbide, a nitride, a carbo-nitride, a carbo-oxide, a carbonitrogen oxide or a boronitride of Ti. The intermediate layer (3) consists of Al2O3 or ZrO2. The outer layer (4) consists of a carbide, a nitride, a carbo-nitride, a carbo-oxide, a carbonitrogen oxide or a boronitride of Ti. The thickness of the inner layer (2) is 0.1 to 5 μm, the thickness of the intermediate layer (3) is 5 to 50 μm in the case of it being an Al2O3 layer and 0.5 to 20 μm in the case of it being a ZrO2 layer, and the thickness of the outer layer (4) is 5 to 100 μm.

Claims23

Dependent claims

A coated hard metal material for a cutting tool comprising a base material selected from the group consisting of cemented carbide and cermet, and a hard coating layer on a surface of said base material, wherein

said hard coating layer comprises:
an inner layer that is arranged on said base material, that consists essentially of at least one layer of a material selected from the group consisting of a carbide, a nitride, a carbo-nitride, a carbo-oxide, a carbonitrogen oxide and a boronitride of Ti, and that has a thickness in the range from 0.1 to 5 μm,
an intermediate layer that is arranged on said inner layer, that is mainly composed of an oxide selected from the group consisting of Al2O3 which is mainly composed of α-Al2O3, ZrO2 and a mixture or a solid solution thereof in which one of Al2O3 and ZrO2 predominates, and that has a thickness which is in the range from 5 to 50 μm when said intermediate layer is mainly composed of said Al2O3 and in the range from 0.5 to 20 μm when said intermediate layer is mainly composed of said ZrO2, and
an outer layer that is arranged on said intermediate layer, that consists essentially of at least one layer composed of TiCN, having a molar C:N ratio in the range of 5:5 to 7:3, and composed of columnar crystals having an aspect ratio in the range from 5 to 80, and that has a thickness in the range from 5 to 10 μm.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 09/204,812Filed 3 Dec 1998 · continuation in part
Priority: JP 6-2645744 Oct 1994
Granted: 6 Feb 2001
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

C23C 28/044
Only coatings of inorganic non-metallic material: coatings specially adapted for cutting tools or wear applications
C23C 28/04
Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by…:…
C23C 30/005
Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process: on…
Y10T 407/27
Cutters, for shaping: comprising tool of specific chemical composition