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

2 Citations (Scopus)

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

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Calcium Hydroxide
Hydrated lime
Carbon fibers
Copper
Thermal conductivity
Composite materials
Lime
Calcium carbide
Thermal expansion
Carbides
Precipitates
Sintering
Heat treatment
Annealing
Transmission electron microscopy
carbon fiber
Temperature
lime

ASJC Scopus subject areas

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

Cite this

Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator : Calcium hydroxide. / Couillaud, S.; Lu, Y. F.; Silvain, J. F.

In: Journal of Materials Science, Vol. 49, No. 16, 08.2014, p. 5537-5545.

Research output: Contribution to journalArticle

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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)).",
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