# US 9,750,990 B2 · Golf club head and low density alloy thereof

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- Number: US 9,750,990 B2
- Document ID: US9750990B2
- Status: Granted
- Kind: B2
- Application number: 14/481,075
- Filed: 2014-09-09
- Published: 2015-03-19
- Granted: 2017-09-05
- Earliest claimed: 2013-09-16
- Assignees: O-TA Precision Industry Co., Ltd.
- Applicants: O-Ta Precision Industry Co., Ltd.
- Inventors: Chuan-Hsien Chang; Jui-Ming Su; Chih-Yeh Chao
- Web page: https://patentgrep.com/patent/US9750990B2

## CPC

- C22C 14/00: Alloys based on titanium
- A63B 53/04: Heads
- A63B 2209/00: Characteristics of used materials
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H)

## Abstract

A golf club head and a low density alloy thereof are provided. The low density alloy has a balanced weight percentage of titanium, 10˜11 wt % aluminum, and trace elements including (C+N+O) <0.2 wt %, silicon <0.2 wt %, and (Fe+Cr+V+Mo) <0.4 wt %. The golf club head has a tensile strength of 90˜110 kips/in2, and a density of 4.18˜4.30 g/cm3. Through heat treatment at a high temperature of 925±25° C., the precipitation or α2 phase of the interfacial interphase can be avoided, and thus the embrittlement phenomena can be improved.

## Claims

### Claim 1

A golf club head having at least a portion of the golf club head made of a titanium-aluminum alloy, the titanium-aluminum alloy comprising:
10˜11 wt % aluminum;
trace elements comprising (C+N+O)<0.2 wt %,Si<0.2 wt %, and (Fe+Cr+V+Mo) <0.4 wt %; and
the balance being titanium;
wherein the titanium-aluminum alloy is subject to a heat treatment at 925 ±25° C. for 1-4hours to obtain a tensile strength in a range of 90˜110 kips/in2and a density in a range of 4.18˜4.30 g/cm3, and the titanium-aluminum alloy after the heat treatment has no α2-phase in an interfacial interphase thereof.

### Claim 2 (depends on 1)

The golf club head according to claim 1, wherein the heat treatment is hot isostatic pressing, swaging, or forging.

### Claim 3 (depends on 1)

The golf club head according to claim 1, wherein the time of heat treatment is 1 hour.

### Claim 4 (depends on 1)

The golf club head according to claim 1, wherein the elongation of the titanium-aluminum alloy is 6˜15%.

### Claim 5 (depends on 1)

The golf club head according to claim 1, wherein the volume of the golf club head is ranged between 410 and 470 cm3, and the weight is ranged between 180 and 210 grams.

### Claim 6

A low density alloy of a golf club head, comprising:
10˜11 wt % aluminum,
trace elements comprising (C+N+O)<0.2 wt %, Si<0.2 wt %, and (Fe+Cr+V+Mo) <0.4 wt %; and
the balance being titanium,
wherein the low density alloy has a tensile strength in a range of 90˜110 kips/in2, a density in a range of 4.18˜4.30 g/cm3 and an elongation in a range of 6˜15%, and the low density alloy has no α2-phase in an interfacial interphase thereof.