Issue 20, 2016

Fabrication of oriented hBN scaffolds for thermal interface materials

Abstract

Thermal interface materials are widely used in thermal management, and usually require a high thermal conductivity, low coefficient of thermal expansion (CTE) and adequate softness. Herein, hBN/PDMS composites are fabricated by the infiltration of a PDMS prepolymer in the hBN scaffolds followed by a thermal curing process. The scaffolds are prepared by an ice templating method with hBN microplatelets, leading to a good alignment of hBN platelets along the z direction in the PDMS matrix. This unique structure results in a high thermal conductivity, which is about 3 times higher than that of the composites fabricated by a casting method, and the thermal conductivity is as high as 1.4 W m−1 K−1 along the z direction at ∼20 wt% of hBN microplatelets. The composites also possess low CTEs which are <100 ppm K−1 along the z direction and maintain an adequate softness.

Graphical abstract: Fabrication of oriented hBN scaffolds for thermal interface materials

Supplementary files

Article information

Article type
Paper
Submitted
12 jan 2016
Accepted
18 jan 2016
First published
29 jan 2016

RSC Adv., 2016,6, 16489-16494

Fabrication of oriented hBN scaffolds for thermal interface materials

H. Shen, C. Cai, J. Guo, Z. Qian, N. Zhao and J. Xu, RSC Adv., 2016, 6, 16489 DOI: 10.1039/C6RA00980H

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