Titanium plate material for fuel cell separators and method for producing same
A technology of fuel cell and manufacturing method, which is applied in the direction of fuel cell components, solid electrolyte fuel cells, and final product manufacturing, and can solve problems such as passive film thickness deviation, contact resistance influence, and separator conductivity deviation, etc., to achieve Effect of reducing contact resistance
Inactive Publication Date: 2015-11-25
KOBE STEEL LTD
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Problems solved by technology
However, in these methods, the conductivity is improved by heat treatment after forming a noble metal film, but in this method, the thickness of the passive film tends to vary.
The size of the contact resistance is easily affected by the thickness of the passive film on the titanium substrate. If the thickness of the passive film varies, the conductivity of the separator as a final product will also vary.
Method used
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[0030] The inventors of the present invention have found in the process of repeated intensive research in order to stably reduce the passive film that there is a specific element that can properly destroy the passive film on the surface and that is characterized by the presence of O, C, and N. The rolling conditions of the titanium layer (hereinafter sometimes referred to as compound mixed titanium layer). The compound-mixed titanium layer is a layer in which one or more compounds selected from O, C, and N and Ti are mixed (especially dispersed) in Ti in which O, C, and N are solid-dissolved. As this compound, TiC will be described as an example. If such a layer is formed on the surface, C in the carbide or solid-solution C will combine with Ti before O in the air, so the titanium on the surface becomes difficult to dissolve in the air. Oxygen reacts, thereby inhibiting the regeneration of the passive film. That is, the inventors have found that both the destruction of the pa...
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Abstract
The purpose of the present invention is to provide a titanium plate material for fuel cell separators, which is capable of surely achieving low contact resistance. A titanium plate material for fuel cell separators according to the present invention is formed of a titanium base layer and a surface layer, and the titanium base layer has a recrystallized structure. The surface layer is formed only of a compound mixed titanium layer which has a thickness of less than 1 μm, and wherein a compound composed of Ti and one or more elements selected from among O, C and N is mixed in a Ti matrix in which O, C and N are solid-solved, or alternatively, the surface layer is formed of the compound mixed titanium layer and a passivation film that is formed on the surface of the compound mixed titanium layer and has a thickness of less than 5 nm.
Description
technical field [0001] The present invention relates to a titanium plate material with low contact resistance useful for fuel cell separators and the like. The separator can be used in polymer electrolyte fuel cells and the like. Background technique [0002] Unlike primary batteries such as dry batteries and rechargeable batteries such as lead storage batteries, fuel cells that can continuously obtain power by continuously supplying fuel such as hydrogen and oxidants such as oxygen have high power generation efficiency and are not greatly affected by the size of the system. In addition, since the fuel cell has less noise and vibration, it can be expected to be an energy source suitable for various applications and scales. As fuel cells, specifically, polymer electrolyte fuel cells (Polymer Electrolyte Fuel Cell, PEFC), alkaline electrolyte fuel cells (Alkaline Fuel Cell, AFC), phosphoric acid fuel cells (Phosphoric Acid Fuel Cell, PAFC), molten carbonate fuel cells have be...
Claims
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IPC IPC(8): H01M8/02B21B1/22B21B3/00C22F1/18C22F1/00H01M8/10
CPCB21B1/22B21B3/00C22F1/183H01M8/02H01M8/10Y02E60/521C22F1/02H01M8/0206Y02E60/50Y02P70/50
Inventor 逸见义男大山英人前田恭志林大辅铃木顺
Owner KOBE STEEL LTD