Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator: Calcium hydroxide

S. Couillaud, Y. F. Lu, J. F. Silvain

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The effects of adding calcium hydroxide (Ca(OH)2) to a copper-CF (30 %) composite (Cu-CF(30 %)) were studied. After sintering at 700 °C, precipitates of calcium oxide (CaO) were included in the copper matrix. When less than 10 % of Ca(OH)2 was added, the thermal conductivity was similar to or higher than the reference composite Cu-CF(30 %). A thermal conductivity of 322 W m-1 K-1 was measured for the Cu-Ca(OH)2(3 %)-CF(30 %) composite. The effects of heat treatment (400, 600, and 1000 °C during 24 h) on the composite Cu-Ca(OH)2(3 %)-CF(30 %) were studied. At the lower annealing temperature, CaO inside the matrix migrated to the interface of the copper matrix and the CF. At 1000 °C, the formation of the interphase calcium carbide (CaC2) at the interface of the copper and CFs was highlighted by TEM observations. Carbide formation at the interface led to a decrease in both thermal conductivity (around 270 W m-1 K-1) and the coefficient of thermal expansion (CTE (10.1 × 10-6 K-1)).

Original languageEnglish (US)
Pages (from-to)5537-5545
Number of pages9
JournalJournal of Materials Science
Volume49
Issue number16
DOIs
StatePublished - Aug 2014

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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