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Optimisation of high thermal conductivity Al/diamond composites produced by gas pressure infiltration by controlling infiltration temperature and pressure

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Abstract

In this study, Al/diamond composites were fabricated by the gas pressure infiltration method. The infiltration temperature and pressure were varied to study their influence on the interfacial microstructures and thermal conductivities of composites. The results show that the infiltration temperature and pressure dramatically affect the reaction between the Al matrix and the diamond particles. The appropriate conditions activate the reaction on the {111} faces of diamond which possesses a higher chemical stability than the {100} faces. The course of the reaction can lead to the structural and chemical modification of the interface, which strongly affects the thermal conductivity of the final composites. Using our optimised parameters of 800 °C and 0.8 MPa, a superior thermal conductivity above 760 W m−1 K−1 was obtained. Controlling the fabrication parameters to optimise the reaction on the {100} and {111} faces can result in a superior Al/diamond material with greater thermal conductivity.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 51301018, 51204155) and International Science and Technology Cooperation Program of China (2014DFA51610). Dr. Y. Zhang also gratefully thanks the support from the Research Project of State Key Laboratory for Advanced Metals and Materials (2014Z-07).

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Authors and Affiliations

  1. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China

    Yang Zhang, Jianwei Li & Xitao Wang

  2. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Science, Beijing, 100190, China

    Lili Zhao

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  1. Yang Zhang
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  2. Jianwei Li
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  3. Lili Zhao
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  4. Xitao Wang
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Correspondence to Yang Zhang or Xitao Wang.

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Zhang, Y., Li, J., Zhao, L. et al. Optimisation of high thermal conductivity Al/diamond composites produced by gas pressure infiltration by controlling infiltration temperature and pressure. J Mater Sci 50, 688–696 (2015). https://doi.org/10.1007/s10853-014-8628-y

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  • DOI: https://doi.org/10.1007/s10853-014-8628-y

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