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Development of pitch-based carbon–copper composites

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Abstract

Carbon–copper composites with varying copper to carbon ratio of 0.66–1.5 (by weight) were developed from coal-tar-pitch-derived green coke (as such or modified with natural graphite) as carbon source and electrolytic grade copper powder at different heat treatment temperatures (HTTs) of 1000–1400 °C. The physical, mechanical, and electrical properties differ depending upon the HTT and also on copper to carbon ratio (Cu/C). The composites prepared at HTT of 1100 °C having Cu/C ratio of 0.66 and 0.9 exhibited a high bending strength of 150 and 140 MPa, bulk density of 2.63 and 2.81 gm/cm3, electrical resistivity of 1.6 and 0.96 m Ω cm and shore hardness of 88 and 84, respectively, in spite of well-known inadequate wettability between copper and carbon. Increasing the temperature from 1100 °C for processing of the composites deteriorated the properties mainly due to the loss of copper through melting above 1100 °C as revealed by X-ray, scanning electron microscopy, thermal analysis and EDAX studies.

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Acknowledgements

The authors are thankful to Dr. P. Banerjee, Acting Director, National Physical Laboratory, for his kind permission to publish this article and to Dr. S. S. Bawa, Head Division of Engineering Materials, for the encouragement throughout the investigation. Thanks are also due to Dr. V. P. S. Awana for his valuable help in X-ray studies. The authors express their sincere thanks to Dr. Chandra Shekher, Director, CEERI, Pilani and Dr. S. N. Joshi, Emeritus Scientist, CEERI, Pilani for giving us an opportunity to co-operate in the network project sponsored by Council of Scientific and Industrial Research (CSIR) and for their continued support in this work. One of the authors (Mr. Anil kumar) is thankful to CSIR for the grant of project assistanceship.

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Authors and Affiliations

  1. Carbon Technology Unit, Division of Engineering Materials, National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India

    Anil Kumar, Mandeep Kaur, Rajeev Kumar, Pinaki Ranjan Sengupta, Vasantha Raman & Gopal Bhatia

  2. Electron Microscope Section, Division of Material Characterization, National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India

    Kedar Nath Sood

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  1. Anil Kumar
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  2. Mandeep Kaur
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  3. Rajeev Kumar
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  4. Pinaki Ranjan Sengupta
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  5. Vasantha Raman
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  6. Gopal Bhatia
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  7. Kedar Nath Sood
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Correspondence to Gopal Bhatia.

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Kumar, A., Kaur, M., Kumar, R. et al. Development of pitch-based carbon–copper composites. J Mater Sci 45, 1393–1400 (2010). https://doi.org/10.1007/s10853-009-4097-0

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