# US 10,501,828 B2 · Aluminum alloy for cylinder head and method of manufacturing the same

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- Number: US 10,501,828 B2
- Document ID: US10501828B2
- Status: Granted
- Kind: B2
- Application number: 15/639,162
- Filed: 2017-06-30
- Published: 2018-05-10
- Granted: 2019-12-10
- Earliest claimed: 2016-11-10
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Kyung Moon Lee; Byung Ho Min; Hoo Dam Lee
- Web page: https://patentgrep.com/patent/US10501828B2

## CPC

- C22C 21/14: with silicon
- C22C 1/026: {Alloys based on aluminium}
- C22C 21/16: with magnesium
- C22C 21/18: with zinc
- C22F 1/057: of alloys with copper as the next major constituent
- C22C 2202/00: Physical properties
- F02F 1/24: Cylinder heads
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES

## Abstract

An aluminum alloy for a cylinder head in a vehicle engine includes 2 to 3% of Si, 2.5 to 3% of Cu, 0.01% or less (excluding 0%) of Zn, 0.15% or less (excluding 0%) of Fe, 0.02% or less (excluding 0%) of Mn, 0.1 to 0.3% of Mg, 0.01% or less (excluding 0%) of Ni, 0.02% or less (excluding 0%) of Ti, 0.1% or less (excluding 0%) of Zr, the balance of Al, and inevitable impurities, wherein an AlCuMgSi-based crystal is formed in an amount ranging from 0.3 to 0.9% and an Al2Cu-based precipitate is formed in an amount ranging from 3.3 to 4.0%, wherein percentage (%) is based on weight.

## Claims

### Claim 1

An aluminum alloy for a cylinder head used in a vehicle engine comprising:
2 to 3% of Si;
2.5 to 3% of Cu;
0.01% or less (excluding 0%) of Zn;
0.15% or less (excluding 0%) of Fe;
0.02% or less (excluding 0%) of Mn;
0.1 to 0.3% of Mg;
0.01% or less (excluding 0%) of Ni;
0.02% or less (excluding 0%) of Ti;
0.1% or less (excluding 0%) of Zr;
the balance of Al; and
inevitable impurities,
wherein an AlCuMgSi-based crystal is formed in an amount ranging from 0.3 to 0.9% and an Al2Cu-based precipitate is formed in an amount ranging from 3.3 to 4.0%,
wherein percentage (%) is based on weight.

### Claim 2 (depends on 1)

The aluminum alloy according to claim 1, wherein the aluminum alloy has a thermal conductivity at 200° C. of 185 W/mK or more.

### Claim 3 (depends on 1)

The aluminum alloy according to claim 1, wherein the aluminum alloy has a tensile strength of 270 MPa or more.

### Claim 4 (depends on 1)

The aluminum alloy according to claim 1, wherein the aluminum alloy has a yield strength of 197 MPa or more and an elongation of 1.6% or more.

### Claim 5

A method of producing an aluminum alloy for a cylinder head used in a vehicle engine comprising:
casting molten composition comprising 2 to 3% of Si, 2.5 to 3% of Cu, 0.01% or less (excluding 0%) of Zn, 0.15% or less (excluding 0%) of Fe, 0.02% or less (excluding 0%) of Mn, 0.1 to 0.3% of Mg, 0.01% or less (excluding 0%) of Ni, 0.02% or less (excluding 0%) of Ti, 0.1% or less (excluding 0%) of Zr, the balance of Al and inevitable impurities to produce an article in the form of a cylinder head; and
conducting solid solution treatment on the article and conducting aging heat treatment such that an AlCuMgSi-based crystal is formed in an amount of 0.3 to 0.9% and an Al2Cu-based precipitate is formed in an amount of 3.3 to 4.0%,
wherein percentage (%) is based on weight.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the aging heat treatment is carried out at a heat treatment temperature of 265 to 275° C. for 2 to 3 hours.