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Coal tar-based mesophase pitch fibers were oxidatively stabilized at 350℃ by the heating rate of 5℃/min or 15℃/min to introduce skin-core structure in the carbon fibers carbonized at 600℃ and further ...calcined at 1300℃ by the heating rate of 10℃/min. The stabilization during the heating to 350℃ by the rate of 5℃/min or for 5-15 min at the same temperature by the rate of 15℃/min introduced skin-core structure in the thin fibers of 10μm in diameter. The thickness of skin and the size of anisotropic domain in the core were controllable by the stabilization conditions. The higher stabilization temperature and rapid heating appear to be favorable to introduce skin-core structure of thinner skin and large domain in the inadhered fibers. The carbonization under strain improved the mechanical strength of carbon fibers with skin-core structure by 0.2 GPa. The formation mechanism of skin-core structure is briefly discussed in terms of competition between the oxidative reaction of the fibers and the diffusion of the oxygen through the oxidized skin.続きを見る
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Mendeley出力
KJ00004507520