Fuel cell separator and method for manufacturing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorDaichi MIYAZAKI
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Abstract
A fuel cell separator includes a metal substrate, and a carbon layer provided on the metal substrate. The carbon layer has a two-layer structure in which a granular layer and a columnar layer are stacked in the thickness direction of the carbon layer. The granular layer is a layer in which granular crystals are randomly deposited, and the columnar layer is a layer in which columnar crystals that each extend along the thickness direction of the carbon layer are aligned.
Claims4
A fuel cell separator comprising:
- a metal substrate;
- and
- a carbon layer provided on the metal substrate,
- wherein the carbon layer has a two-layer structure in which a granular layer and a columnar layer are stacked in a thickness direction of the carbon layer, the granular layer being a layer in which granular crystals are randomly deposited, and the columnar layer being a layer in which columnar crystals that each extend along the thickness direction of the carbon layer are aligned.
A method for manufacturing a fuel cell separator including a metal substrate and a carbon layer provided on the metal substrate, the method comprising forming the carbon layer by physical vapor deposition,
- wherein the forming of the carbon layer includes
- forming a granular layer in which granular crystals are randomly deposited, either by applying a predetermined voltage as a bias voltage to the metal substrate or without applying the bias voltage to the metal substrate, and
- forming a columnar layer in which columnar crystals that each extend along a thickness direction of the carbon layer are aligned, by applying a bias voltage higher than the predetermined voltage to the metal substrate.
Dependencies are inferred from the claim text.