# US 11,440,086 B2 · Method for producing Cu—Ni—Sn alloy and cooler to be used for same

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- Number: US 11,440,086 B2
- Document ID: US11440086B2
- Status: Granted
- Kind: B2
- Application number: 17/206,285
- Filed: 2021-03-19
- Published: 2021-09-30
- Granted: 2022-09-13
- Earliest claimed: 2020-03-30
- Assignees: NGK Insulators, Ltd.
- Applicants: Ngk Insulators, Ltd.
- Inventors: Kensuke Ishii
- Web page: https://patentgrep.com/patent/US11440086B2

## CPC

- B22D 11/1246: {Nozzles; Spray heads}
- B22D 11/004: {Copper alloys}
- B22D 11/049: for direct chill casting, e.g. electromagnetic casting
- B22D 11/225: {for secondary cooling}
- C22C 9/06: with nickel or cobalt as the next major constituent
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

There is provided a method for producing a Cu—Ni—Sn alloy by a continuous casting method or a semi-continuous casting method, the method including pouring a molten Cu—Ni—Sn alloy from one end of a mold, both ends of which are open, and continuously drawing out the alloy as an ingot from the other end of the mold while solidifying a part of the alloy, the part being near the mold; and spraying mist-like liquid on the drawn-out ingot to cool the ingot, thereby making a cast product of the Cu—Ni—Sn alloy.

## Claims

### Claim 1

A method for producing a Cu—Ni—Sn alloy by a continuous casting method or a semi-continuous casting method, the method comprising:
pouring a molten Cu—Ni—Sn alloy from one end of a mold, both ends of which are open, and continuously drawing out the alloy as an ingot from the other end of the mold while solidifying a part of the alloy, the part being near the mold; and
spraying a liquid mist on the drawn-out ingot to cool the ingot, thereby making a cast product of the Cu—Ni—Sn alloy,
wherein the Cu—Ni—Sn alloy is a spinodal alloy comprising 8 to 22% by weight Ni and 4 to 10% by weight Sn, with the balance being Cu and inevitable impurities.

### Claim 2 (depends on 1)

The method for producing a Cu—Ni—Sn alloy according to claim 1, wherein the Cu—Ni—Sn alloy is a spinodal alloy comprising 14 to 16% by weight Ni and 7 to 9% by weight Sn, with the balance being Cu and inevitable impurities.

### Claim 3 (depends on 1)

The method for producing a Cu—Ni—Sn alloy according to claim 1, wherein the ingot having passed through the mold is cooled to 50° C. or lower within 2 hours after completion of the casting method.

### Claim 4 (depends on 1)

The method for producing a Cu—Ni—Sn alloy according to claim 1, wherein cooling is performed by allowing the ingot to pass through a cooler disposed immediately below the mold.

### Claim 5 (depends on 4)

The method for producing a Cu—Ni—Sn alloy according to claim 4, wherein the cooler comprises:
a cylindrical main body;
a liquid supply part provided at an upper part of the cylindrical main body and configured in such a way as to discharge liquid downward; and
an air ejection part that ejects air toward a central axis of the cylindrical main body, the air ejection part provided below the liquid supply part.

### Claim 6 (depends on 5)

The method for producing a Cu—Ni—Sn alloy according to claim 5, wherein the cooler is configured in such a way that the liquid that is discharged downward is mixed with the air without directly hitting against the ingot.

### Claim 7 (depends on 1)

The method for producing a Cu—Ni—Sn alloy according to claim 1, wherein the ingot is supported by a receiving table, and the receiving table is lowered at a speed of 25 to 40 mm/min.

### Claim 8 (depends on 1)

The method for producing a Cu—Ni—Sn alloy according to claim 1, wherein the liquid is water.