Patent EP0045291A1 successfully refreshed from Google Patents.
EP0045291A1
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Method of making a coated cemented carbide body and body produced in such a manner
Assignee: Sandvik AB
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Filing: 1981-07-20
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Granted: —
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Expires: 2001-07-20
Abstract
Abstract In coating cemented carbide or ceramics with thin, wear resistant layers of ceramic oxide, particularly aluminum oxide, by CVD, it has been very difficult to make sufficiently even layers and to obtain desired thickness of the layer within reasonable coating times. According to the invention an improved method utilizing a sulfur, selenium and/or tellurium dopant is now available by which a considerable increase of the growth rate of the layer as well as optimal properties regarding evenness and thickness of the layer have been obtained, making the product better suited for cutting operation.
Inventors
- 👤 Jan Lindström
- 👤 Ulf Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 05:29
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C23; C23C; C23C30/00; C23C30/005
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
79 words
Method of making a body comprising a substrate or core of one or more cemented carbides or ceramics and at least one thin, wear resistant surface layer consisting essentially of aluminum oxide in which the substrate is contacted with a gas containing one or more halides of aluminum and a hydrolyzing and/or oxidizing agent at high temperature, to form the aluminum oxide layer, characteri- zed in that an amount of sulfur, selenium and/or tellurium is added to the gas.
Claim 2
Dependent Claim
79 words
Method of making a body comprising a substrate or core of one or more cemented carbides or ceramics and at least one thin, wear resistant surface layer consisting essentially of aluminum oxide in which the substrate is contacted with a gas containing one or more halides of aluminum and a hydrolyzing and/or oxidizing agent at high temperature, to form the aluminum oxide layer, characteri- zed in that an amount of sulfur, selenium and/or tellurium is added to the gas.
Claim 3
Dependent Claim
28 words
Method according to claim 1, wherein the added amount of sulfur, selenium and/or tellurium is from about 0.01 to 1 % by volume of the total gas volume.
Claim 4
Dependent Claim
28 words
Method according to claim 2 wherein the added amount of sulfur, selenium and/or tellurium is from about 0.02 to 0.3 % by volume of the total gas volume.
Claim 5
Dependent Claim
27 words
Method according to claim 1 wherein the addition also includes methane gas whereby a significant portion of the aluminum oxide layer is obtained in the kappa form.
Claim 6
Dependent Claim
61 words
Method of making an aluminum oxide-coated body wherein a cemented carbide or ceramic substrate is contacted with a gas containing an aluminum halide and hydrolyzing and/or oxidizing agent at high temperature, characteri- zed in that methane gas is added to the gas in an amount sufficient to result in at least 85% of the aluminum oxide being in the kappa form.
Claim 7
Dependent Claim
61 words
Method of making an aluminum oxide-coated body wherein a cemented carbide or ceramic substrate is contacted with a gas containing an aluminum halide and hydrolyzing and/or oxidizing agent at high temperature, characteri- zed in that methane gas is added to the gas in an amount sufficient to result in at least 85% of the aluminum oxide being in the kappa form.
Claim 8
Dependent Claim
29 words
Method of claim 5 wherein the methane gas is added in an amount of from about 0.5 to about 90% by volume of the total volume of gas added.
Claim 9
Dependent Claim
41 words
Coated body containing at least one metal carbide or ceramic compound on which body there is applied at least one thin, wear resistant surface layer consisting essentially of aluminum oxide, characterized in that the aluminum oxide layer is of uniform thickness.
Claim 10
Dependent Claim
41 words
Coated body containing at least one metal carbide or ceramic compound on which body there is applied at least one thin, wear resistant surface layer consisting essentially of aluminum oxide, characterized in that the aluminum oxide layer is of uniform thickness.
Claim 11
Dependent Claim
20 words
The coated body of claim 7 wherein the aluminum oxide layer has a thickness of from 0.1 to 20 microns.
Claim 12
Dependent Claim
48 words
The coated body of claim 8 wherein a thin intermediate layer of wear resistant carbide, nitride, carbonitride and/ /or boride of one or more of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si and/or B,.is applied between the aluminum oxide layer and the substrate.
Claim 13
Dependent Claim
21 words
The coated body of claims 8 or 9 wherein at least 85% of the aluminum oxide consists of the kappa form.
Claim 14
Dependent Claim
23 words
Coated body according to claim 9, characteri- zed in that the thickness of the intermediate layer is from 1 to 8 / um.
Claim 15
Dependent Claim
23 words
Coated body according to claim 11, characte- rized in that the thickness of the intermediate layer is from 1.5 to 7 / um.
Claim 16
Dependent Claim
22 words
Coated body according to claim 11, characte- rized in that the intermediate layer consists of the carbide, nitride and/or carbonitride of titanium.
Claim 17
Dependent Claim
29 words
Coated body according to claim 1, characteri- zed in that the aluminum oxide layer and/or the surface zone of the substrate contains minor amounts of sulfur, selenium and/or tellurium.
References Cited (Backward Citations)
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