PURPOSE: To produce a triaxial wove fabric suitable as a reinforcing material having a light weight bad a high modulus of elasticity by using the bundle of carbon fibers started from an optically anisotropic pitch and having a specific crimp releasing ratio.
CONSTITUTION: This triaxial woven fabric is obtained by weaving a triaxial woven fabric having 45-300g/m2 weight, a crimp releasing ratio [(L1-L)/L] satisfying [(Lo-L)Lo]×0.7≥[(L1-L)/L]≥0 (L is the length of the warp yarn fiber bundle, Lo is the length along the direction of the crimp of the warp yarn fiber bundle having the length L, and L1 is the drawing out length of a fiber from the fiber bundle having the length L) and also having a basic structure in which both warp and waft yarns cross each other by the angle of ±60° from the weaving width direction, by using the bundle of carbon fibers made form an optically anisotropic pitch as a raw material and having ≥300kgf/mm2 tensile strength, ≥0.6% tensile breakage distortion, ≥15tf/mm2 tensile modulus of elasticity and 40-300g/mm2 thickness as warp yarn and a weft yarn having substantially the same cross section of the bundle of fibers, and then heat-treating the fabric at ≥1800°C under an inert gas atmosphere and immersing it into a resin to obtain a triaxial woven fabric resin matrix composite having ≥3tf/mm2 tensile modulus of elasticity.
SHIBATA HIROTAKA
KUBOMURA KENJI
NIPPON STEEL CHEMICAL CO
SAKASE ADTEC KK
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