US4420142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Machine component of oxide ceramic material
Assignee: Cerasiv GmbH Innovatives Keramik Engineering
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Filing: 1981-07-01
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Granted: 1983-12-13
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Expires: 2001-07-01
Abstract
Abstract A machine component is disclosed composed of 3.0 to 25 weight percent of zirconium oxide and/or hafnium oxide which are present in the interior of the machine component at room temperature predominantly in the metastable tetragonal modification and at the surface of the machine component in the monoclinic modification, said machine component having a profile bearing ratio of about 10 to 40% and an center line average surface roughness Ra in the contact area of less than 0.3 mu m. The machine components of the present invention are leakproof, exhibit good thermal shock durability and exhibit good frictional engagement characteristics for long periods of time.
Inventors
- 👤 Ulf Dworak
- 👤 Hans Jud
- 👤 Hans Olapinski
- 👤 Dieter Fingerle
- 👤 Ulrich Krohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:57
CPC Classifications
F; F16; F16K; F16K25/00; F16K25/005; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C04B35/16; C04B35/18; C04B35/185; F16K11/00; F16K11/02; F16K11/06; F16K11/072; F16K11/074; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86815; Y10T137/86823
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A machine component for sliding contact and sealing action with and structural support of another component comprising said machine component containing from about (a) 3.0-25 weight percent of zirconium oxide, hafnium oxide or mixtures thereof which are present at room temperature, predominantly in the metastable, tetragonal modification, in the interior of the machine component and, in the monoclinic modification, at the surface of the machine component; (b) a structural support section expressed as profile bearing ratio of 10 to 40%; and (c) an center line average surface roughness R a of less than 0.3 μm.
Claim 2
Dependent Claim
95 words
A machine component for sliding contact and sealing action with and structural support of another component comprising said machine component containing from about (a) 3.0-25 weight percent of zirconium oxide, hafnium oxide or mixtures thereof which are present at room temperature, predominantly in the metastable, tetragonal modification, in the interior of the machine component and, in the monoclinic modification, at the surface of the machine component; (b) a structural support section expressed as profile bearing ratio of 10 to 40%; and (c) an center line average surface roughness R a of less than 0.3 μm.
Claim 3
Dependent Claim
23 words
The machine component of claim 1 wherein the proportion of zirconium oxide or hafnium oxide lies between about 7 and 16% by weight.
Claim 4
Dependent Claim
21 words
The machine component of claim 1 or 2 wherein the average roughness R a lies between about 0.1 and 0.03 μm.
Claim 5
Dependent Claim
20 words
The machine component of claim 1 or 2 wherein the aluminum oxide content is at least about 75 weight percent.
Claim 6
Dependent Claim
21 words
The machine component of claim 1 or 2 in the form of a slip ring for axially sealing a plain bearing.
Claim 7
Dependent Claim
18 words
The machine component of claim 1 or 2 in the form of a valve disc for mixing valves.
Claim 8
Dependent Claim
19 words
The machine component of claim 1 or 2 in the form of a valve disc for sanitary water mixers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |