Patent US4701384A successfully refreshed from Google Patents.
US4701384A
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Composite coatings on cemented carbide substrates
Assignee: Verizon Laboratories Inc
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Filing: 1987-01-20
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Granted: 1987-10-20
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Expires: 2007-01-20
Abstract
Abstract A wear resistant article, such as a cutting tool. A cemented carbide substrate is coated with a composite ceramic coating having at least two phases. The first phase is a continuous oxide matrix layer 0.1-20 microns thick of oxides of alumina, zirconia, or yttria. At least one discontinuous second or additional phase of oxides of aluminum, zirconium, or yttrium, or solid solutions thereof, is dispersed as discrete particles within the matrix layer. The additional phase material is different from the matrix material.
Inventors
- 👤 Vinod K. Sarin
- 👤 Hans E. Hintermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:36
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89; C23; C23C; C23C30/00; C23C30/005
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A wear resistant article comprising: a cemented carbide substrate body; and a fully dense, adherent, wear resistant, composite ceramic coating having at least two phases on the substrate comprising: a continuous oxide layer about 0.1-20 microns thick of a material selected from the group consisting of the oxides of aluminum, zirconium, and yttrium; and at least one discontinuous additional phase dispersed as discrete particles within the oxide layer, of at least one material selected from the group consisting of oxides of aluminum, zirconium, and yttrium, the at least one material being different from that of the oxide layer.
Claim 2
Dependent Claim
98 words
A wear resistant article comprising: a cemented carbide substrate body; and a fully dense, adherent, wear resistant, composite ceramic coating having at least two phases on the substrate comprising: a continuous oxide layer about 0.1-20 microns thick of a material selected from the group consisting of the oxides of aluminum, zirconium, and yttrium; and at least one discontinuous additional phase dispersed as discrete particles within the oxide layer, of at least one material selected from the group consisting of oxides of aluminum, zirconium, and yttrium, the at least one material being different from that of the oxide layer.
Claim 3
Dependent Claim
54 words
An article according to claim 1 further comprising, between the substrate body and the composite ceramic layer, at least one intermediate layer about 0.5-10 microns thick of one or more materials selected from the group consisting of carbides, nitrides, and carbonitrides of Ti, Zr, Hf, Va, Nb, Ta, Cr, Mo, W, Si, and B.
Claim 4
Dependent Claim
24 words
An article according to claim 1 wherein the continuous oxide layer is ZrO 2 and the additional phase is Y 2 O 3 .
Claim 5
Dependent Claim
24 words
An article according to claim 1 wherein the continous oxide layer is Y 2 O 3 and the additional phase is ZrO 2 .
Claim 6
Dependent Claim
29 words
An article according to claim 1 wherein the continuous oxide layer is Al 2 O 3 and the additional phase is Y 2 O 3 stabilized ZrO 2 .
Claim 7
Dependent Claim
30 words
An article according to claim 1 wherein the continuous oxide layer is Al 2 O 3 and the additional phases are Y 2 O 3 particles and ZrO 2 particles.
Claim 8
Dependent Claim
19 words
An article according to claim 1 wherein the additional phase is substantially evenly dispersed within the continuous oxide layer.
Claim 9
Dependent Claim
24 words
An article according to claim 7 wherein the continuous oxide layer is Al 2 O 3 and the additional phase is ZrO 2 .
Claim 10
Dependent Claim
28 words
An article according to claim 8 further comprising, between the substrate body and the composite ceramic layer, an intermediate layer of TiC or TiN about 2.5 microns thick.
Claim 11
Dependent Claim
22 words
An article according to claim 8 wherein the ZrO 2 particles comprise less than 5 volume % of the composite ceramic layer.
Claim 12
Dependent Claim
30 words
An article according to claim 1 wherein the composite ceramic layer is a stratified layer in which portions having at least two phases alternate with single phase continuous oxide portions.
Claim 13
Dependent Claim
78 words
An article according to claim 11 wherein the substrate body is a WC-Co composite, the continuous oxide layer is Al 2 O 3 and the additional phase is ZrO 2 particles dispersed within the Al 2 O 3 to form two-phase Al 2 O 3 /ZrO 2 portions alternating with single-phase continuous Al 2 O 3 portions, and further comprising, between the substrate body and the composite ceramic layer, an intermediate layer of TiC about 2-5 microns thick.
Claim 14
Dependent Claim
22 words
An article according to claim 12 wherein the ZrO 2 particles comprise less than 5 volume % of the composite ceramic layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |