# US 10,865,466 B2 · High temperature alloy for casting engine valves

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- Number: US 10,865,466 B2
- Document ID: US10865466B2
- Status: Granted
- Kind: B2
- Application number: 16/703,331
- Filed: 2019-12-04
- Published: 2020-04-02
- Granted: 2020-12-15
- Earliest claimed: 2016-12-23
- Assignees: Caterpillar Inc.
- Applicants: Caterpillar Inc.
- Inventors: Mark D. Veliz; Caian Qiu; Thomas J. Yaniak
- Web page: https://patentgrep.com/patent/US10865466B2

## CPC

- C22C 19/057: {with the maximum Cr content being less 10%}
- C22C 19/056: {with the maximum Cr content being at least 10% but less than 20%}
- F01L 3/00: Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L 3/02: Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
- F01L 3/20: Shapes or constructions of valve members, not provided for in preceding subgroups of this group
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES

## Abstract

A high temperature alloy is disclosed. The high temperature alloy may have on a weight basis: about 9.0-10.0 weight % of Co, about 0.25 weight % maximum of Fe, about 8.0-9.0 weight % of Cr, about 4.75-5.50 weight % of Al, about 1.0-1.5 weight % of Ti, about 0-2.0 weight % of Mo, about 6.0-9.0 weight %, of W, about 0.12-0.18 weight % of C, about 0.01-0.03 weight % of Zr, about 0.005-0.015 weight % of B, about 0.5-1.5 weight % of Ta, a balance of Ni, and incidental impurities.

## Claims

### Claim 1

A high temperature alloy, comprising, on a weight basis:
Co: 9.0-10.0 weight %,
Cr: 8.0-9.0 weight %,
Al: 4.75-5.50 weight %,
Ti: 1.0-1.5 weight %,
Mo: 0-2.0 weight %,
W: 6.0-9.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

### Claim 2 (depends on 1)

The high temperature alloy of claim 1, wherein Cr is about 8.5 weight %.

### Claim 3 (depends on 2)

The high temperature alloy of claim 2, wherein Mo is about 1.75 weight %.

### Claim 4 (depends on 3)

The high temperature alloy of claim 3, wherein W is about 7.5 weight %.

### Claim 5 (depends on 4)

The high temperature alloy of claim 4, wherein Ta is about 1.25 weight %.

### Claim 6

A high temperature alloy, comprising, on a weight basis:
Co: 4.0-7.0 weight %,
Cr: 15.0-17.0 weight %,
Al: 4.75-5.50 weight %,
Ti: 0.75-1.5 weight %,
Mo: 0-2.0 weight %,
Nb: 0-0.7 weight %,
W: 1.0-3.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

### Claim 7 (depends on 6)

The high temperature alloy of claim 6, including, on a weight basis:
Co: about 7.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: about 1.5 weight %,
Nb: about 0.5 weight %,
W: about 1.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: about 1.0 weight %, and
a balance of Ni and incidental impurities.

### Claim 8 (depends on 7)

The high temperature alloy of claim 7, wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

### Claim 9 (depends on 7)

The high temperature alloy of claim 7, wherein a shrinkage during solidification ranges between about 5% and 5.5%.

### Claim 10 (depends on 6)

The high temperature alloy of claim 6, including, on a weight basis:
Co: about 6.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: about 0.5 weight %,
W: about 2.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: about 1.5 weight %, and
a balance of Ni and incidental impurities.

### Claim 11 (depends on 10)

The high temperature alloy of claim 10, wherein a solidification temperature range of the high temperature alloy is between about 50° C. and about 60° C.

### Claim 12 (depends on 10)

The high temperature alloy of claim 10, wherein a shrinkage during solidification ranges between about 5% and 5.5%.

### Claim 13 (depends on 5)

The high temperature alloy of claim 5, wherein the amount of y′ phase in the alloy ranges between about 50 weight % and 60 weight % at a temperature of about 800° C.

### Claim 14

A high temperature alloy, comprising, on a weight basis:
Co: 3.0-7.5 weight %,
Cr: 15.0-17.0 weight %,
Al: 4.25-6.0 weight %,
Ti: 0.75-2.0 weight %,
Mo: 0-2.0 weight %,
Nb: 0-0.75 weight %,
W: 1.0-3.0 weight %,
C: 0.12-0.18 weight %,
Zr: 0.01-0.03 weight %,
B: 0.005-0.015 weight %,
Ta: 0.5-1.5 weight %, and
a balance of Ni and incidental impurities.

### Claim 15 (depends on 14)

The alloy of claim 14, including, on a weight basis:
Co: 6.0-7.0 weight %,
Cr: about 16.0 weight %,
Al: about 5.0 weight %,
Ti: about 1.0 weight %,
Mo: 0.5-1.5 weight %,
Nb: 0-0.5 weight %
W: 1.5-2.5 weight %,
C: about 0.15 weight %,
Zr: about 0.02 weight %,
B: about 0.01 weight %,
Ta: 1.0-1.5 weight %, and
a balance of Ni and incidental impurities.

### Claim 16 (depends on 15)

The alloy of claim 15, wherein Co is about 7.0 weight %.

### Claim 17 (depends on 16)

The alloy of claim 16, wherein Mo is about 1.5 weight %.

### Claim 18 (depends on 17)

The alloy of claim 17, wherein W is about 1.5 weight %.

### Claim 19 (depends on 18)

The alloy of claim 18, wherein Ta is about 1.0 weight %.

### Claim 20 (depends on 15)

The high temperature alloy of claim 15, wherein the amount of y′ phase in the alloy ranges between about 50 weight % and 60 weight % at a temperature of about 800° C.