US4602731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct liquid phase bonding of ceramics to metals
Assignee: Borg Warner Corp
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Filing: 1984-12-24
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Granted: 1986-07-29
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Expires: 2004-12-24
Abstract
Abstract The direct liquid phase bonding of ceramics to metals or other ceramics in an inert atmosphere without prior metallization wherein a nickel-plated aluminum-silicon brazing alloy or aluminum or aluminum alloy filler material between the ceramic and metal layers provides a joint of high strength at a low bonding temperature without affecting the ceramic microstructure or the mechanical properties of the materials. This technique is also useful for fabricating composite laminates.
Inventors
- 👤 Kostas F. Dockus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:22
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/003; C04B37/005; B; B23; B23K; B23K35/00; B23K35/001; C04B37/006; C04B37/02; C04B37/023; C04B37/025; C04B37/026; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6581; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/064; C04B2237/12; C04B2237/123; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/365; C04B2237/368; C04B2237/38; C04B2237/40; C04B2237/402; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/52; C04B2237/70; C04B2237/704; C04B2237/72; C04B2237/86
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
90 words
A method of bonding at least two material layers together, at least one layer being a ceramic, comprising the steps of cleaning the surfaces of the layers to be bonded, plating a brazing alloy sheet with nickel, nickel-lead or cobalt-lead, sandwiching the plated brazing alloy between the material layers to be bonded, heating the material layers and brazing alloy to a temperature in the range of 1100° to 1200° F. for a time period of three to five minutes in an inert atmosphere or vacuum, and cooling the bonded article.
Claim 2
Independent Claim
90 words
A method of bonding at least two material layers together, at least one layer being a ceramic, comprising the steps of cleaning the surfaces of the layers to be bonded, plating a brazing alloy sheet with nickel, nickel-lead or cobalt-lead, sandwiching the plated brazing alloy between the material layers to be bonded, heating the material layers and brazing alloy to a temperature in the range of 1100° to 1200° F. for a time period of three to five minutes in an inert atmosphere or vacuum, and cooling the bonded article.
Claim 3
Dependent Claim
26 words
A method of bonding as set forth in claim 1, wherein one of said layers is a ceramic material and the other layer is a metal.
Claim 4
Dependent Claim
37 words
A method of bonding as set forth in claim 2, in which said metallic layer is selected from the group consisting of cast iron, steel, stainless steel, aluminum, titanium and an alloy of iron, nickel and cobalt.
Claim 5
Dependent Claim
25 words
A method of bonding as set forth in claim 3, wherein said metallic layer is plated with a thin film of nickel, nickel-lead or cobalt-lead.
Claim 6
Dependent Claim
19 words
A method of bonding as set forth in claim 1, in which both of said layers are ceramic materials.
Claim 7
Dependent Claim
21 words
A method of bonding as set forth in claim 5, in which the ceramic materials of the two layers are identical.
Claim 8
Dependent Claim
30 words
A method of bonding as set forth in claim 1, wherein said ceramic layer is selected from the group consisting of zirconia, alumina, tungsten carbide, silicon carbide and silicon nitride.
Claim 9
Dependent Claim
25 words
A method of bonding as set forth in claim 7, wherein said ceramic layer is plated with a thin film of nickel, nickel-lead or cobalt-lead.
Claim 10
Dependent Claim
21 words
A method of bonding as set forth in claim 1, in which said heating step is carried out in a vacuum.
Claim 11
Dependent Claim
26 words
A method of bonding as set forth in claim 1, in which said inert atmosphere is selected from the group consisting of nitrogen, argon and helium.
Claim 12
Dependent Claim
59 words
A method of bonding as set forth in claim 1, in which said heating step includes a preheating stage in a furnace to raise the layers to 500° F., a high temperature stage in the range of 1100° to 1200° F., and a low temperature stage allowing the article to cool to 500° F. before removing from the furnace.
Claim 13
Dependent Claim
41 words
A method of bonding as set forth in claim 1, in which a layer of alumina or Kovar is interposed between the metal and ceramic layers when the metal and ceramic layers have a substantial difference in the coefficients of expansion.
Claim 14
Dependent Claim
28 words
A method of bonding as set forth in claim 12, in which a sheet of a brazing alloy or aluminum filler material is interposed between all three layers.
References Cited (Backward Citations)
US2739375A
Cited
US2857663A
Cited
US3057445A
Cited
US3110571A
Cited
US3517432A
Cited
US3482305A
Cited
US4019080A
Cited
US3766634A
Cited
US3970237A
Cited
US3908886A
Cited
US4028200A
Cited
US3994430A
Cited
US4483810A
Cited
JPS58190880A
Cited
US4488673A
Cited
US4552301A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |