Electrically Nonconductive Thermal Pastes with Carbon as the Thermally Conductive Component |
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Authors: | Chuangang Lin Timothy A Howe DDL Chung |
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Affiliation: | (1) Composite Materials Research Laboratory, University at Buffalo, State University of New York, Buffalo, NY 14260-4400, USA |
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Abstract: | Electrically nonconductive thermal pastes have been attained using carbon (carbon black or graphite) as the conductive component
and ceramic (fumed alumina or exfoliated clay) as the nonconductive component. For graphite particles (5 μm), both clay and alumina are effective in breaking up the electrical connectivity, resulting in pastes with electrical resistivity
up to 1013Ω·cm and thermal contact conductance (between copper surfaces of roughness 15 μm) up to 9 × 104 W/m2·°C. For carbon black (30 nm), clay is more effective than alumina, providing a paste with resistivity 1011 Ω·cm and thermal contact conductance 7 × 104 W/m2·°C. Carbon black increases the thermal stability, whereas either graphite or alumina decreases the thermal stability. The
antioxidation effect of carbon black is further increased by the presence of clay up to 1.5 vol.%. The addition of clay (up
to 0.6 vol.%) or alumina (up to 2.5 vol.%) to graphite paste enhances the thermal stability. |
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Keywords: | Carbon black graphite clay alumina thermal paste polyol ester thermal conductance electrical resistivity |
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