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

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

doi:10.1007/s10853-014-8246-8

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

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

Electrical & Computer Engineering

Research output: Contribution to journal › Article › peer-review

6 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 language	English (US)
Pages (from-to)	5537-5545
Number of pages	9
Journal	Journal of Materials Science
Volume	49
Issue number	16
DOIs	https://doi.org/10.1007/s10853-014-8246-8
State	Published - Aug 2014

ASJC Scopus subject areas

Ceramics and Composites
Materials Science (miscellaneous)
General Materials Science
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics

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

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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year = "2014",

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T1 - Thermal conductivity improvement of copper-carbon fiber composite by addition of an insulator

T2 - Calcium hydroxide

AU - Couillaud, S.

AU - Lu, Y. F.

AU - Silvain, J. F.

PY - 2014/8

Y1 - 2014/8

N2 - 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)).

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

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