Effect of chromium carbide coating on thermal properties of short graphite fiber/Al composites

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• 作者：Tingting Liu (1)
  Xinbo He (1)
  Qian Liu (1)
  Shubin Ren (1)
  Qiping Kang (1)
  Lin Zhang (1)
  Xuanhui Qu (1)
  
• 刊名：Journal of Materials Science
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：49
• 期：19
• 页码：6705-6715
• 全文大小：1,738 KB
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• 作者单位：Tingting Liu (1)
  Xinbo He (1)
  Qian Liu (1)
  Shubin Ren (1)
  Qiping Kang (1)
  Lin Zhang (1)
  Xuanhui Qu (1)
  
  1. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, 30 Xue Yuan Road, Beijing, 100083, China
  
• ISSN：1573-4803

文摘

A chromium carbide coating was synthesized onto graphite fibers by molten salts method to improve the interfacial bonding and thermal properties of short graphite fiber/Al composites which were fabricated by vacuum pressure infiltration technique. The graphite fiber/Al composites with different thicknesses of chromium carbide coatings were prepared through varying plating times to investigate the influence of chromium carbide layer on the microstructures and thermal properties of the composites. The combined Maxwell–Garnett effective medium approach and acoustic mismatch model schemes were used to theoretically predict thermal conductivities of the composites. The results indicated that the chromium carbide coating formed on graphite fiber surface in molten salts consists mainly of the Cr7C3 phase. The Cr7C3-coating layer with plating time of 60?min and thickness of 0.5?μm was found to be most effective in improving the interfacial bonding and decreasing the interfacial thermal resistance between graphite fiber and aluminum matrix. The 40?vol% Cr7C3-coated graphite fiber/Al composite with Cr7C3 thickness of 0.5?μm exhibited 45.4?% enhancement in in-plane thermal conductivity of 221?W?m??K? compared to that of uncoated composite, as well as the coefficient of thermal expansion of 9.4?×?10??K?, which made it as very interesting material for thermal management applications.