US3789498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of diffusion bonding
Assignee: MICHIGAN DYNAMICS Inc A CORP OF MI
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Filing: 1971-11-01
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Granted: 1974-02-05
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Expires: 1991-11-01
Abstract
Abstract A separator is used in the diffusion bonding of materials such as wire cloth and laminates to prevent unwanted bonding of adjacent surfaces. The separator sheet is formed by the oxidation of metal alloy surfaces either before or during the bonding to form a refractory oxide barrier layer. Iron-chromium-aluminum alloys are especially useful and may be modified by the addition of rare earth metals such as yttrium.
Inventors
- 👤 F Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:28
CPC Classifications
B; B23; B23K; B23K28/00; B23K28/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
13 words
The method according to claim 1, each sheet consisting of an iron-chromium-aluminum alloy.
Claim 2
Dependent Claim
23 words
The method according to claim 2, each sheet having a composition of about 80 percent iron, 15 percent chromium and 4 percent aluminum.
Claim 3
Dependent Claim
19 words
The method according to claim 3, each sheet having about 0.5 - 1.0 percent of a rare earth metal.
Claim 4
Dependent Claim
12 words
The method according to claim 4, said rare earth metal being yttrium.
Claim 5
Dependent Claim
23 words
The method according to claim 2, each sheet having a composition of 69 percent iron, 25 percent chromium and 6 percent aluminum. Pg,9
Claim 6
Independent Claim
105 words
A method of diffusion bonding a multiple stacked layer of metals laminates or cloths comprising the steps of taking separator sheets having an iron-chromium-aluminum alloy composition, preoxidizing the separator sheets by heating in an oxidizing atmosphere to form a stable barrier oxide film, inserting the sheets between the laminates or cloths each laminate or cloth containing a plurality of metal parts to be diffusion bonded, pressing the stack together and heating the stack in an inert or reducing atmosphere to diffusion bond the metal parts of each laminate or cloth the separator sheets preventing unwanted bonding of the surfaces of the metal parts adjacent thereto.
Claim 7
Dependent Claim
27 words
The combination according to claim 7, said separator sheets also being placed between the outermost laminates or cloths and the adjacent means for pressing the stack together.
Claim 8
Dependent Claim
28 words
The combination according to claim 7, the composition of said separator sheets being in the range of 12 - 25 percent chromium and 2 - 6 percent aluminum.
Claim 9
Dependent Claim
19 words
The combination according to claim 7, the composition of said sheets including 15 percent chromium and 4 percent aluminum.
Claim 10
Dependent Claim
23 words
The combination according to claim 10, the alloy also containing about 0.5 - 1.0 percent of a rare earth metal such as yttrium.
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |