銅-炭素短繊維複合材料の熱膨張挙動

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  • Thermal Expansion Behavior of Randomly Oriented Short Carbon Fiber Reinforced Copper Composites
  • ドウ タンソ タンセンイ フクゴウ ザイリョウ ノ ネツ ボウチョウ キョドウ

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We have already reported the development of a new copper-carbon fiber composite which possesses the properties of copper, i.e., the excellent electrical and thermal conductivities and the property of carbon fiber, i.e., a small thermal expansion coefficient(1). The properties of the composite were expected to vary depending on the orientation of fibers. When applying the composite to some electronic devices, however, the properties of the composite have to be isotropic.<BR>For this purpose, several experiments were carried out on the composites with random orientation of short carbon fibers. Results obtained in this study were as follows:<BR>(1) The composite with random orientation of short carbon fibers swelled due to the elastic deformation of random-oriented carbon fiber’s skelton at temperatures above 573 K. It was deduced that in a three-dimensionally isotropic composite such as above-mentioned, the copper matrix softened above 573 K was fractured by the repulsive force of carbon fibers which had been elastically deformed and were released at heating, resulting in the swelling of the composite.<BR>This swelling occurred, when the fiber content was over 20 volume percent or the fiber length exceeded 0.5 mm.<BR>(2) It was found that the addition of carbide forming elements such as titanium was effective to prevent the above swelling.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 49 (12), 1137-1141, 1985

    公益社団法人 日本金属学会

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