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AssigneeToray Industries, Inc.
InventorsKentaro KAJIWARA, Satoru SHIMOYAMA, Tomoyuki HORIGUCHI
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Provided is a carbon-fiber nonwoven cloth with low resistance to gases or liquids passing through, and low resistance in the thickness direction to heat or electricity, which is particularly appropriate for a gas diffusion electrode of a polymer electrolyte fuel cell; the cloth having an air gap with a diameter of at least 20 μm, at least some of the carbon fibers being continuous from one surface to the other surface, and the apparent density being 0.2-1.0 g/cm3, or, having an air gap with a diameter of at least 20 μm and at least some of the carbon fibers being mutually interlaced, and further, at least some of the carbon fibers being oriented toward the thickness direction and the apparent density being 0.2-1.0 g/cm3.
A carbon-fiber nonwoven cloth, which comprises carbon fibers and has two surfaces, and which has voids each having a diameter of 20 μm or more and has an apparent density of 0.2 to 1.0 g/cm3, at least one part of the carbon fibers being continuous from one of the surfaces to the other surface.
A carbon-fiber nonwoven cloth, which comprises carbon fibers and which has voids each having a diameter of 20 μm or more and an apparent density of 0.2 to 1.0 g/cm3, at least one part of the carbon fibers being entangled with each other, and at least one part of the carbon fibers being oriented in the thickness direction of the nonwoven cloth.
A method for manufacturing a carbon-fiber nonwoven cloth, comprising:
A composite sheet, comprising a web comprising fibers each having a carbonization yield of 30% or more, and a fiber fabric having a carbonization yield of 20% or less, wherein at least one part of the fibers having a carbonization yield of 30% or more penetrate the fiber fabric having a carbonization yield of 20% or less.
Dependencies are inferred from the claim text.