CARBON FIBER-REINFORCED COMPOSITE MATERIAL

WIPO Patent Application WO/2023/008357

A1

[Problem] The present invention addresses the problem of controlling the CFRP structure to provide a low-edgeglow-risk CFRP without relying on costly electroconductive particles. In other words, the present invention addresses the problem of providing a CFRP in which the risk of edgeglow is greatly reduced even if electroconductive particles are used at an amount equal to or lower than that according to prior art. Furthermore, the present invention addresses the problem of providing a CFRP in which the risk of edgeglow is greatly reduced even if no electroconductive particles are used. [Solution] A carbon-fiber-reinforced composite material obtained by stacking, in multiple directions, carbon fiber sheets in which carbon fibers are oriented in one direction and impregnating and curing a matrix resin. When, in the carbon fiber sheets, a region in which the fiber orientation angle of the carbon fibers remains the same continuously in the thickness direction is deemed to be a layer, and in a case in which the layer comprises a plurality of regions that have a uniform thickness and between which the carbon fiber volume content (Vcf) differs, said regions having a uniform thickness are deemed to be sublayers, the carbon fiber sheets include a specific layer satisfying conditions (1) to (3), and the thickness of a resin portion between the specific layer and at least one layer adjacent to the specific layer is 5 μm or below. (1) The average value of Vcf of the layer (hereafter referred to as the layer Vcf average value) is 50% or above. (2) Sublayers having a Vcf whose ratio relative to the layer Vcf average value is 0.5 or higher (hereafter referred to as a high-Vcf sublayer) are disposed on the outermost parts on both sides of the layer, each having a Vcf average value higher than the layer Vcf average value. (3) A sublayer having a Vcf whose ratio relative to the layer Vcf average value is lower than 0.5 (hereafter referred to as a low-Vcf sublayer) is present between the high-Vcf sublayers on the outermost parts on both sides of the layer.

YAMANE TAKUYA (JP)
OCHI TAKASHI (JP)

PCT/JP2022/028583

February 02, 2023

July 25, 2022

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TORAY INDUSTRIES (JP)

B29C70/20; B29B15/12; B32B5/28; B29K105/08

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JP2017197665A	2017-11-02

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