Patent US4749118A successfully refreshed from Google Patents.
US4749118A
Expired / Lapsed
US
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Method for bonding ceramic to metal
Assignee: Hitachi Ltd
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Filing: 1987-02-02
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Granted: 1988-06-07
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Expires: 2007-02-02
Abstract
Abstract When a ceramic is bonded to a metal having a low thermal expansion, if a Cr layer of a Cr diffusion layer is formed on the surface of the metal and the ceramic is bonded to the metal through this Cr layer or Cr diffusion layer by an Al insert, a bonded structure having a good air-tightness and a high strength is obtained.
Inventors
- 👤 Kazuaki Yokoi
- 👤 Toshihiro Yamada
- 👤 Akiomi Kohno
- 👤 Motohiro Satou
- 👤 Hiroyuki Kawamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:00
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; H; H01; H01M; H01M10/00; H01M10/36; H01M10/39; H01M10/3909; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/121; C04B2237/122; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/365; C04B2237/368; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/59; C04B2237/595; C04B2237/70; C04B2237/708; C04B2237/76; C04B2237/765; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
64 words
A method for bonding a ceramic to a metal, which comprises inserting an Al insert or an Al alloy in the bonding surface between the ceramic and the metal and heating the assembly under an elevated pressure, wherein a Cr layer is formed on the surface of the metal and the ceramic is bonded to the metal through the Cr layer by the insert.
Claim 2
Independent Claim
64 words
A method for bonding a ceramic to a metal, which comprises inserting an Al insert or an Al alloy in the bonding surface between the ceramic and the metal and heating the assembly under an elevated pressure, wherein a Cr layer is formed on the surface of the metal and the ceramic is bonded to the metal through the Cr layer by the insert.
Claim 3
Dependent Claim
27 words
A method for bonding a ceramic to a metal according to claim 1, wherein the metal is an alloy composed mainly of Fe-Ni, Fe-Ni-Co, Fe-Ni-Cr or Fe-Ni-Ti.
Claim 4
Dependent Claim
30 words
A method for bonding a ceramic to a metal according to claim 1, wherein the surface of the metal is subjected to a chromizing treatment to form a Cr layer.
Claim 5
Dependent Claim
50 words
A method for bonding a ceramic to a metal according to claim 1, wherein a Cr layer is formed on the surface of the metal by a chromizing treatment, the thickness of the insert is at least 2 mm and the bonding pressure is 0.15 to 1.0 kgf/mm 2 .
Claim 6
Independent Claim
70 words
A method for bonding a ceramic to a metal, which comprises inserting an Al insert or an Al alloy in the bonding surface between the ceramic and the metal and heating the assembly under an elevated pressure, wherein a layer composed mainly of Cr is formed on the surface of the metal and the ceramics is bonded to the metal through the layer composed mainly of Cr by the insert.
Claim 7
Independent Claim
70 words
A method for bonding a ceramic to a metal, which comprises inserting an Al insert or an Al alloy in the bonding surface between the ceramic and the metal and heating the assembly under an elevated pressure, wherein a layer composed mainly of Cr is formed on the surface of the metal and the ceramics is bonded to the metal through the layer composed mainly of Cr by the insert.
Claim 8
Dependent Claim
27 words
A method for bonding a ceramic to a metal according to claim 5, wherein the metal is an alloy composed mainly of Fe-Ni, Fe-Ni-Co, Fe-Ni-Cr or Fe-Ni-Ti.
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) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |