US4075364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic seals and method of making same
Assignee: Technetics Corp
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Filing: 1976-04-15
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Granted: 1978-02-21
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Expires: 1996-04-15
Abstract
Abstract A ceramic-metal composite laminate capable of exposure to high temperature differentials without damage, consisting of an inner ceramic layer, an outer metal layer and an intermediate interface layer of a low modulus metallic low density structure having a high melting point. The ceramic layer is secured to the low modulus structure directly or through an intermediate ceramic-metal composite, and the outer metal layer is brazed to the intermediate low modulus layer. Thermal strains caused by a temperature differential between the inner and outer layers are taken up without harmful effect by the intermediate low modulus layer.
Inventors
- 👤 Carlino Panzera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:05
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/02; B32B7/00; B32B7/04; C; C04; C04B; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/123; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/38; C04B2237/40; C04B2237/405; C04B2237/50; C04B2237/59; C04B2237/592; C04B2237/60; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49337; Y10T29/4981; Y10T29/49826; Y10T29/49885; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12458; Y10T428/12493; Y10T428/12535
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
150 words
A method of making a ceramic-metal composite comprising the steps of: (a) providing a metal plate and a metal pad having a density of ranging from 5 to 80%; (b) bonding the pad to be the metal plate; (c) plasma spraying on the exposed surface of the metal pad a mixture of ceramic material and a sacrificial material where the volume fraction of the sacrificial material is increased from zero percent to 60 percent at convenient intervals to effect strength and porosity required; the sacrificial material being selected from one or more, but not limited to the following: graphite, plastic, aluminum, copper and sawdust; the inert ceramic layer being selected from one or more, but not limited to the following: stabilized zirconia, calcia, magnesia, yttria, glass, silicon carbide, silicon nitride, alumina, mullite, borides, silicides, and cermets; (d) removal of sacrificial material by a chemical reaction such as oxidation or leaching.
Claim 2
Independent Claim
150 words
A method of making a ceramic-metal composite comprising the steps of: (a) providing a metal plate and a metal pad having a density of ranging from 5 to 80%; (b) bonding the pad to be the metal plate; (c) plasma spraying on the exposed surface of the metal pad a mixture of ceramic material and a sacrificial material where the volume fraction of the sacrificial material is increased from zero percent to 60 percent at convenient intervals to effect strength and porosity required; the sacrificial material being selected from one or more, but not limited to the following: graphite, plastic, aluminum, copper and sawdust; the inert ceramic layer being selected from one or more, but not limited to the following: stabilized zirconia, calcia, magnesia, yttria, glass, silicon carbide, silicon nitride, alumina, mullite, borides, silicides, and cermets; (d) removal of sacrificial material by a chemical reaction such as oxidation or leaching.
Claim 3
Independent Claim
189 words
A method of making a three layer ceramic-metal composite comprising the steps of: (a) providing a resilient metallic layer with a density range of from about 5 to 80% having two surfaces; (b) providing a ceramic layer having a controlled porosity and a controlled strength by plasma spraying on one of the surfaces of the low modulus layer a mixture of a ceramic material and a sacrificial material where the volume fraction of the sacrificial material is increased from zero percent to 60 percent at convenient intervals to effect strength and porosity required; the sacrificial material being selected from one or more, but not limited to the following: graphite, plastic, aluminum, copper and sawdust; the inert ceramic layer being selected from one or more, but not limited to the following: stabilized zirconia, calcia, magnesia, yttria, glass, silicon carbide, silicon nitride, alumina, mullite, borides, silicides, and cermets; (c) removal of sacrificial material by a chemical reaction such as oxidation or leaching; (d) providing a plate of metal; and (e) bonding the exposed surface of the low modulus layer without the ceramic material to the metal plate to form a composite.
Claim 4
Independent Claim
189 words
A method of making a three layer ceramic-metal composite comprising the steps of: (a) providing a resilient metallic layer with a density range of from about 5 to 80% having two surfaces; (b) providing a ceramic layer having a controlled porosity and a controlled strength by plasma spraying on one of the surfaces of the low modulus layer a mixture of a ceramic material and a sacrificial material where the volume fraction of the sacrificial material is increased from zero percent to 60 percent at convenient intervals to effect strength and porosity required; the sacrificial material being selected from one or more, but not limited to the following: graphite, plastic, aluminum, copper and sawdust; the inert ceramic layer being selected from one or more, but not limited to the following: stabilized zirconia, calcia, magnesia, yttria, glass, silicon carbide, silicon nitride, alumina, mullite, borides, silicides, and cermets; (c) removal of sacrificial material by a chemical reaction such as oxidation or leaching; (d) providing a plate of metal; and (e) bonding the exposed surface of the low modulus layer without the ceramic material to the metal plate to form a composite.
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) | 1981-02-20 | 1981-08-22 | 1982-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-20 | 1985-08-22 | 1986-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-20 | 1989-08-22 | 1990-02-21 | $7700.00 | Window Closed / Lapsed |