炭素
Online ISSN : 1884-5495
Print ISSN : 0371-5345
ISSN-L : 0371-5345
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2021 巻, 296 号
選択された号の論文の7件中1～7を表示しています
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技術報告
  • 炭素繊維の熱膨張計測システムの開発
    岩下 哲雄, 渡辺 博道, 山田 修史
    2021 年 2021 巻 296 号 p. 2-8
    発行日: 2021/01/15
    公開日: 2021/02/26
    DOIhttps://doi.org/10.7209/tanso.2021.2
    ジャーナル フリー
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    The coefficient of thermal expansion of a carbon fiber in the longitudinal direction is relatively small, and is difficult to measure because of the “negative thermal expansion”, which means that the carbon fiber shrinks when heated around room temperature. In order to realize a simple and highly accurate evaluation, a measurement system that uses a trolley-type sample holder and a direct current heating method was developed. The thermal expansion of the fiber sample in the longitudinal and the diametral (transverse) directions was detected using a laser interferometer and an optical diffraction, respectively. The developed thermal expansion measurement system is explained, and the results of the measurements of the temperature dependence of the thermal expansion coefficient in the longitudinal and the diametral (transverse) directions of several carbon fibers from room temperature to 800 °C are given.

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解説
  • 炭素繊維
    圖子 博昭, 鈴木 慶宜, 杉浦 直樹
    2021 年 2021 巻 296 号 p. 9-33
    発行日: 2021/01/15
    公開日: 2021/02/26
    DOIhttps://doi.org/10.7209/tanso.2021.9
    ジャーナル 認証あり
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    Carbon fibers are an ultra-lightweight material with excellent mechanical and physical properties, and can therefore be used in a wide range of applications. For example, carbon fiber-reinforced plastics (CFRPs) mainly containing polyacrylonitrile (PAN)-based carbon fibers are effective in the fabrication of lightweight transportation equipment such as aircraft, automobiles, ships, drones and flying cars. They can decrease carbon dioxide emissions by improving fuel efficiency and accordingly conserve fossil resources. In addition, many machines such as the robotic arms/hands used to transport large liquid crystal substrates or long conveyor rolls for ultra-high speed production, use CFRPs containing pitch-based carbon fibers, especially mesophase pitch-based carbon fibers, due to their excellent damping properties. This paper focuses on carbon fibers that were invented in Japan and Japanese companies lead the world in this field. The first half of each section describes the manufacturing history of PAN-based carbon fibers invented in 1959 and pitch-based ones invented in 1963, and the second half introduces technology developments and recent R&D trends for both types. In addition, the current status of recycling technologies for CFRPs is summarized.

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