# US 4,380,479 A · Foils of brittle alloys

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- Number: US 4,380,479 A
- Document ID: US4380479A
- Status: Granted
- Kind: A
- Application number: 06/332,430
- Filed: 1981-12-21
- Granted: 1983-04-19
- Earliest claimed: 1981-12-21
- Assignees: GTE Products Corporation
- Inventors: Brian C. Coad
- Web page: https://patentgrep.com/patent/US4380479A

## CPC

- C23C 24/06: Compressing powdered coating material, e.g. by milling
- B23K 35/0244: {Powders, particles or spheres; Preforms made therefrom}
- B23K 35/3033: {Ni as the principal constituent}
- B23K 35/0233: {Sheets or foils (B23K35/0244 takes precedence)}
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM

## Abstract

Nickel based brazing alloys containing embrittling additives are made by depositing a powder blend on a nickel substrate and roll compacting to form an alloy foil having the desired metallurgical content.

## Claims

### Claim 1

A process for making a nickel-base brazing foil containing nickel and other elements in a predetermined metallurgical content said process comprising
(a) forming a relatively uniform powder blend containing nickel and said other elements,
(b) depositing said blend relatively uniformly on a nickel strip, and
(c) passing said blend and said strip through the rolls of a rolling mill to achieve at least about 3% elongation of the nickel strip to form a foil of said predetermined metallurgical context.

### Claim 2 (depends on 1)

A process according to claim 1 wherein the ratio of thickness of said powder blend on a 100% dense basis to the thickness of said nickel strip varies from about 2:1 to about 22:1.

### Claim 3 (depends on 1)

A process according to claim 1 wherein said elongation is from about 5% to about 15%.

### Claim 4 (depends on 1)

A process according to claim 1 wherein said blend is deposited as a paste and then is heated to about 180.degree. C. just to rolling.

### Claim 5 (depends on 4)

A process according to claim 4 wherein said foil is annealed at a temperature of from about 750.degree. C. to about 950.degree. C. in an inert atmosphere or in a vacuum.