Titanium or titanium alloy material for fuel cell separator having high contact conductivity with carbon and high durability, fuel cell separator including the same, and manufacturing method therefor
US-2015147678-A1 · May 28, 2015 · US
Titanium material or titanium alloy material having surface electrical conductivity, and fuel cell separator and fuel cell using the same
US10033052B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10033052-B2 |
| Application number | US-201515100890-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 22, 2015 |
| Priority date | Jan 22, 2014 |
| Publication date | Jul 24, 2018 |
| Grant date | Jul 24, 2018 |
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Abstract
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The composition ratio of a titanium hydride [ITi—H/(ITi+ITi—H)]×100 found from the maximum intensity of metal titanium (ITi) and the maximum intensity of the titanium hydride (ITi—H) of the X-ray diffraction peaks measured at a surface of a titanium or a titanium alloy at an incident angle to the surface of 0.3° is 55% or more, a titanium oxide film is formed on an outermost surface of the titanium or the titanium alloy, and C is at 10 atomic % or less, N is at 1 atomic % or less, and B is at 1 atomic % or less in a position where the surface has been subjected to sputtering of 5 nm with argon. The titanium oxide film is formed by performing stabilization treatment after performing passivation treatment in prescribed aqueous solutions, and has a thickness of 3 to 10 nm.
First claim
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The invention claimed is: 1. A titanium material or a titanium alloy material, wherein the composition ratio of a titanium hydride [I Ti—H /(I Ti +I Ti—H )]×100 found from the maximum intensity of metal titanium (I Ti ) and the maximum intensity of the titanium hydride (I Ti—H ) of the X-ray diffraction peaks measured at a surface of a titanium or a titanium alloy at an incident angle to the surface of 0.3° is 55% or more, a titanium oxide film is formed on an outermost surface of the titanium or the titanium alloy, C is at 10 atomic % or less, N is at 1 atomic % or less, and B is at 1 atomic % or less in a position where the surface has been subjected to sputtering of 5 nm with argon, and each of the amounts of increase in contact resistance from before to after deterioration test 1 and deterioration test 2 below is 10 mΩcm 2 or less, deterioration test 1: immersion for 4 days in a sulfuric acid solution at 80° C. and pH 3 containing 2 ppm F ions, deterioration test 2: application of an electric potential of 1.0 V (vs. SHE) for 24 hours in a sulfuric acid solution at 80° C. and pH 3. 2. A fuel cell separator comprising the titanium material or the titanium alloy material according to claim 1 . 3. A polymer electrolyte fuel cell comprising the fuel cell separator according to claim 2 .
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- What does patent US10033052B2 cover?
- The composition ratio of a titanium hydride [ITi—H/(ITi+ITi—H)]×100 found from the maximum intensity of metal titanium (ITi) and the maximum intensity of the titanium hydride (ITi—H) of the X-ray diffraction peaks measured at a surface of a titanium or a titanium alloy at an incident angle to the surface of 0.3° is 55% or more, a titanium oxide film is formed on an outermost surface of the tita…
- Who is the assignee on this patent?
- Nippon Steel & Sumitomo Metal Corp
- What technology area does this patent fall under?
- Primary CPC classification C22C14/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 24 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).