US3607369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming porous aluminum layer
Assignee: Union Carbide Corp
•
Filing: 1968-09-11
•
Granted: 1971-09-21
•
Expires: 1988-09-11
Abstract
Abstract A method for forming a thin porous aluminum layer of interstitial and interconnected small pores on aluminum base material by mixing a slurry including a selected elemental bonding component, and aluminum powder matrix, a relatively insoluble aluminum brazing flux, and a vehicle, loosely coating the base material with the slurry, drying the coating and thereafter brazing the coating together and to the base material.
Inventors
- 👤 Louis Bela Batta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:57
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/003; A; A61; A61C; A61C8/00; B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/36; B32; B32B; B32B15/00; B32B15/20; C; C23; C23C; C23C24/00; D; D06; D06F; D06F75/00; D06F75/08; D06F75/10; D06F75/14; D06F75/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
15 words
A method according to claim 1 in which elemental zinc comprises said metal bonding component.
Claim 2
Dependent Claim
15 words
A method according to claim 1 in which zinc bromide comprises said reactive metal halide.
Claim 3
Dependent Claim
37 words
A method according to claim 1 in which said brazing flux comprises on a weight basis: 18 percent lithium chloride, 30 percent sodium chloride, 36 percent potassium chloride, 8 percent lithium fluoride, and 8 percent zinc chloride.
Claim 4
Dependent Claim
37 words
A method according to claim 1 in which said brazing flux comprises on a weight basis; 9 percent lithium chloride 19 percent sodium chloride, 27 percent potassium chloride, 7 percent lithium fluoride, and 38 percent zinc bromide.
Claim 5
Dependent Claim
13 words
A method according to claim 1 in which methanol comprises said liquid vehicle.
Claim 6
Dependent Claim
91 words
A method according to claim 1 in which said slurry comprises on a weight basis: 36 percent aluminum powder of between about 115 and 400 mesh size as said matrix component, 11 percent zinc powder of between about 115 and 400 mesh size as said metal bonding component, 2 percent water, 0.2 percent sodium chromate as a corrosion inhibitor, 18 percent methanol as said liquid vehicle, and 2.9 percent lithium chloride, 6.0 percent chloride, 8.7 percent potassium chloride, 2.2 percent lithium fluoride, and 13 percent zinc bromide as said brazing flux.
Claim 7
Dependent Claim
34 words
A method according to claim 1 in which said powder matrix component is cleaned in a dilute acid solution, and thereafter washed in water, rinsed in organic solvent and dried prior to said mixing.
Claim 8
Dependent Claim
31 words
A method according to claim 1 in which the viscosity of said slurry is sufficient to provide a coating thickness of between about 10 and 15 mils on said base material.
Claim 9
Dependent Claim
78 words
A method according to claim 1 in which said base material is a heat exchanger assembly with parts brazed together at temperature above 1,000 * F. but below the melting point of aluminum, and said base material is coated according to steps (a) through (e) and the metal-coated base material is further heated according to step (e) at temperature below 1,000* F. to braze said metal coating to said base material as a porous layer of metal particles.
References Cited (Backward Citations)
US1155974A
Cited
US1817888A
Cited
US2323169A
Cited
US2541813A
Cited
US2763921A
Cited
US2694647A
Cited
GB791502A
Cited
US2885304A
Cited
US2927043A
Cited
US3041206A
Cited
US3091029A
Cited
GB980727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |