# US 4,399,096 A · High temperature brazing alloys

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- Number: US 4,399,096 A
- Document ID: US4399096A
- Status: Granted
- Kind: A
- Application number: 06/385,700
- Filed: 1982-06-07
- Granted: 1983-08-16
- Earliest claimed: 1982-06-07
- Assignees: Williams Gold Refining Company Incorporated
- Inventors: Dwarika P. Agarwal; Clyde E. Ingersoll
- Web page: https://patentgrep.com/patent/US4399096A

## CPC

- B23K 35/322: {a Pt-group metal as principal constituent}
- 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

A brazing alloy composition for joining chromium containing base metal alloys containing, by weight, palladium about 39%-60%, nickel about 20%-47.5%, and at least one element selected from the group consisting of silver 0-35%, tin 0-32%, indium 0-32% and gallium 0-11%; and optionally containing one or more elements selected from the group consisting of gold 0-10%, germanium 0-4.4%, silicon 0-2.9% and about 0.025% of a known deoxidizer such as lithium. The alloy exhibits good wetting and flowing characteristics and has excellent strength and corrosion resistance at elevated temperatures. The brazing alloy is particularly useful for joining chromium containing baese metal alloys of the type which are used in the porcelain-fused-to-metal technic in dental prosthetics.

## Claims

### Claim 1

A brazing alloy for joining chromium containing base metal alloys, said brazing alloy having sufficient strength and corrosion resistance to withstand subsequent heating to temperatures up to about 1800.degree. F. without undergoing any significant distortion or sagging, consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5% and at least one element selected from the group consisting of silver 0-35%, tin 0-32%, indium 0-32% and gallium 0-11%; and optionally containing one or more elements selected from the group consisting of gold 0-10%, germanium 0-4.4% and silicon 0-2.9%.

### Claim 2 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5%, silver about 4.8%-35% and at least one additional element selected from the group consisting of tin 0-31.6%, indium 0-18.7% and gallium 0-11%; and optionally one or more elements selected from the group consisting of gold 0-10%, germanium 0-4.4% and silicon 0-2.9%.

### Claim 3 (depends on 1, 2)

A brazing alloy according to claim 1 or 2, consisting essentially of the following constituents in the indicated persentages by weight: palladium about 39%-60%, nickel about 20%-47.5%, silver about 3.2%-35% and tin 0.3%-31.6% wherein the total of said silver and tin is at least 3.5%.

### Claim 4 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated precentages by weight: palladium about 53.5%, nickel about 35.6%, silver about 7.1%, tin about 3.8% and lithium about 0.025%.

### Claim 5 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5%, silver about 4.8%-35% and optionally one or more elements selected from the group consisting of tin 0-31.6%, indium 0-18.7%, gallium 0-11%, gold 0-10%, germanium 0-4.4% and silicon 0-2.9%.

### Claim 6 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5% and silver about 4.8%-35%.

### Claim 7 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5% and tin about 4.4%-31.6%.

### Claim 8 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5% and indium about 6%-18.7%.

### Claim 9 (depends on 1)

A brazing alloy according to claim 1 consisting essentially of the following constituents in the indicated percentages by weight: palladium about 39%-60%, nickel about 20%-47.5% and gallium about 3.5%-11%.

### Claim 10 (depends on 1)

A brazing alloy according to claim 1 which is suitable for having porcelain fired thereon.

### Claim 11 (depends on 10)

A brazing alloy according to claim 10 which contains about 0.025% of a known deoxidizer.

### Claim 12 (depends on 11)

A brazing alloy according to claim 11 wherein the deoxidizer is lithium.