炭化ケイ素繊維の高温曝露による特性変化

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タイトル別名
  • Strength and structure of SiC fiber after exposure at high temperatures.
  • タンカ ケイソ センイ ノ コウオン バクロ ニ ヨル トクセイ ヘンカ

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抄録

High strength continuous SiC fibers are synthesized from polycarbosilane. The fiber which consists of ultrafine grain crystallites of β-SiC has high tensile strength at high temperatures in air. But, the behavior of the fiber after exposure for long time at high temperatures, has not been investigated yet. Therefore, the changes of strength and structure of the SiC fiber after exposure were studied by measuring tensile strength, analyzing X-ray-diffraction, scanning electron microscopical observation, and chemical element analysis. The SiC fibers were exposed at 800 to 1400°C, for 0.5 to 1000hours, in air or argon gas atmosphere. The strength and structure of the fibers were measured at room temperature. The results obtained are summarized as follows: (1) The SiC fibers maintained the strength higher than 2GPa after exposure at 800°C for 1000 hours, at 1000°C for 100 hours and at 1200°C for one hour in either atmosphere. (2) The strength decreased at temperatures above 1200°C. (3) At 1400°C in argon gas, the decrease of strength results from the crystal growth and the escape of CO gas formed by the interaction of C and O contained in the fibers. (4) At 1400°C in air, the decrease of strength results from the cracks of the SiO2 skin formed around the fiber.

収録刊行物

  • 材料

    材料 36 (407), 840-846, 1987

    公益社団法人 日本材料学会

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