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Microstructures and Thermal Properties of Cold-Sprayed Cu-Cr Composite Coatings

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Abstract

Copper-based composites for thermal conductive components were prepared via the cold spray process, and the deposition efficiency and adhesion morphology of feedstock powders on Cu substrate were evaluated. Cu-based composites were fabricated using Cu-Cr mixed powders with their mixture ratio of 20, 35, 50, and 65 mass% Cr onto oxygen-free copper substrate with N2 carrier gas. Cu-Cr composite coatings were investigated for their Cr content ratio, microstructures, and thermal conductivity. The Cr content ratio in the coating was approximately 50-60% of feedstock mixture ratio due to the low formability of the hard particles. Transmission electron microscopy characterizations revealed that an oxygen-rich layer exists at the Cr particle/Cu substrate interface, which contributes to the deposition of the Cr particles. After the heat treatment at 1093 K, the coatings showed denser cross-sectional structures than those before the heat treatment, and the thermal conductivity was improved as a result of the recrystallization of Cu matrix.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Toyohashi University of Technology, Toyohashi, Japan

    S. Kikuchi, S. Yoshino, M. Yamada & M. Fukumoto

  2. Hitachi Research Laboratory, Hitachi Ltd., Hitachi, Japan

    K. Okamoto

Authors
  1. S. Kikuchi
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  2. S. Yoshino
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  3. M. Yamada
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  4. M. Fukumoto
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  5. K. Okamoto
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Correspondence to S. Kikuchi.

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Kikuchi, S., Yoshino, S., Yamada, M. et al. Microstructures and Thermal Properties of Cold-Sprayed Cu-Cr Composite Coatings. J Therm Spray Tech 22, 926–931 (2013). https://doi.org/10.1007/s11666-013-9926-7

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  • DOI: https://doi.org/10.1007/s11666-013-9926-7

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