Triaxial fabric composed of carbon fiber strands and method for production thereof
AssigneesNippon Steel Corporation, Sakase Adteck Co.
InventorsKenji Kubomura, Hiromi Kimura, Hirotaka Shibata
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Abstract
A triaxial fabric composed of carbon fiber strands is provided, which has a crimp releasing ratio (L'-L)/L satisfying (L.sub.0 -L)/L.sub.0 !.times.0.7.gtoreq.(L'-L)/L.gtoreq.0. Since the crimps of the fiber strands composing the fabric are preliminarily fixed, fiber breakage due to abrasion in the intersecting portions of the fabric is prevented, whereby a high quality triaxial fabric is obtained. A method for the production of such a fabric is also provided.
Claims8
A triaxial fabric wherein two sets of warp yarns (bias yarns) of carbon fiber strands are interwoven with one set of weft yarns (0.degree. directional yarns) of carbon fiber strands having the same cross-sectional area as the bias yarn and arranged in the widthwise direction of the fabric, characterized in that the fabric has a crimp releasing ratio (L'-L)/L, after being subjected to a heat treatment at 1800.degree. C. in an inert gas atmosphere, satisfying the following equation:
- (L.sub.0 -L)/L.sub.0 .times.0.07.gtoreq.(L'-L)/L.gtoreq.0
- wherein L is a apparent length of the weft yarn composing the triaxial fabric;
- L.sub.0 is a length of the weft yarn along the crimp;
- and L' is an apparent length of the weft yarn when removed from the fabric.
A method for producing a triaxial fabric characterized in that carbon fiber strands having a tensile strength of 300 kgf/mm.sup.2 or more, a tensile strain at break of 0.6% or more and a tensile modulus of 15 tf/mm.sup.2 or more are woven into a triaxial fabric, which then is subjected to a heat treatment in an inert gas atmosphere at a temperature of 1800.degree. C. or more.
Dependencies are inferred from the claim text.