Patent US4025036A successfully refreshed from Google Patents.
US4025036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fabrication of high impact strength composites
Assignee: Ex-Cell-O Corp
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Filing: 1976-05-12
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Granted: 1977-05-24
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Expires: 1996-05-12
Abstract
Abstract An improved method for treating surfaces of aluminum sheets, and in particular, boron reinforced aluminum sheets, to render such sheets more amenable to diffusion bonding which consists in contacting the sheets prior to such diffusion bonding with an aqueous solution containing chloride ions to thereby cause etch pitting on the surfaces.
Inventors
- 👤 Paul Melnyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:28
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/22; B23K20/233; B23K20/2336; B23K20/24
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
38 words
The method of diffusion bonding aluminum surfaces which comprises treating oxide-free surfaces of aluminum with an aqueous solution containing a sufficiently high chloride ion concentration to cause etch-pitting on said surfaces, and then diffusion bonding said surfaces together.
Claim 2
Independent Claim
38 words
The method of diffusion bonding aluminum surfaces which comprises treating oxide-free surfaces of aluminum with an aqueous solution containing a sufficiently high chloride ion concentration to cause etch-pitting on said surfaces, and then diffusion bonding said surfaces together.
Claim 3
Dependent Claim
15 words
The method of claim 1 in which said diffusion bonding is carried out in air.
Claim 4
Dependent Claim
25 words
The method of claim 2 in which the diffusion bonding is carried out at temperatures of from 750° to 950° F. (399° to 510° C.).
Claim 5
Dependent Claim
29 words
The method of claim 1 in which said surfaces are freed of oxides prior to contact with said aqueous solution by means of an acid reagent containing hydrofluoric acid.
Claim 6
Independent Claim
62 words
The method of diffusion bonding together two surfaces of boron reinforced aluminum matrices which comprises cleaning the surfaces with an aqueous solution of hydrofluoric acid to remove surface metal oxides, contacting the thus cleaned surfaces with an aqueous solution having a sufficiently high chloride ion concentration to cause etch pitting on said surfaces, and thereafter diffusion bonding the thus treated surfaces together.
Claim 7
Independent Claim
62 words
The method of diffusion bonding together two surfaces of boron reinforced aluminum matrices which comprises cleaning the surfaces with an aqueous solution of hydrofluoric acid to remove surface metal oxides, contacting the thus cleaned surfaces with an aqueous solution having a sufficiently high chloride ion concentration to cause etch pitting on said surfaces, and thereafter diffusion bonding the thus treated surfaces together.
Claim 8
Dependent Claim
24 words
The method of claim 5 in which said surface is desmutted with nitric acid after the chloride ion treatment and before the diffusion bonding.
Claim 9
Dependent Claim
41 words
The method of claim 5 in which said diffusion bonding is carried out in air at a temperature of 750° to 950° F. (399° to 510° C.) and at a pressure of from 8 to 10 ksi (55 to 69 MPa).
Claim 10
Dependent Claim
50 words
In the method of diffusion bonding together two surfaces of boron fiber reinforced aluminum wherein such surfaces are bonded together under heat and pressure, the improvement which comprises etching the surfaces with a chloride ion bath to cause etch pitting of said surfaces prior to diffusion bonding said surfaces together.
Claim 11
Dependent Claim
50 words
In the method of diffusion bonding together two surfaces of boron fiber reinforced aluminum wherein such surfaces are bonded together under heat and pressure, the improvement which comprises etching the surfaces with a chloride ion bath to cause etch pitting of said surfaces prior to diffusion bonding said surfaces together.
Claim 12
Dependent Claim
24 words
The method of claim 8 in which the surfaces are etched to a depth of from 0.00005 to 0.0004 inch (127 to 1016 microns).
Claim 13
Dependent Claim
24 words
The method of claim 8 in which said chloride ion bath is a solution of from 5 to 10% by weight of hydrochloric acid.
References Cited (Backward Citations)
US3937387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |