Preparation of h-BN microspheres for nanocomposites with high through-plane thermal conductivity
- Authors
- Mun, Hyung Jin; Park, Ji Young; Lim, Minseob; Cho, Hong-Baek; Choa, Yong-Ho
- Issue Date
- Dec-2023
- Publisher
- American Ceramic Society
- Keywords
- hexagonal-boron nitride; polymer nanocomposites; spray-dry process; through-plane thermal conductivity
- Citation
- Journal of the American Ceramic Society, v.106, no.12, pp 1 - 11
- Pages
- 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- Journal of the American Ceramic Society
- Volume
- 106
- Number
- 12
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/112995
- DOI
- 10.1111/jace.19219
- ISSN
- 0002-7820
1551-2916
- Abstract
- In recent times, electronics have been increasingly minimized, and hence, heat dissipation has become essential. Owing to its high thermal conductivity and superior electrical insulation, hexagonal-boron nitride (h-BN) has been regarded as an appropriate ceramic material to increase the thermal conductivity of polymer nanocomposites for effective heat dissipation. However, the poor through-plane thermal conductivity of h-BN severely restricts its practical uses, and it is favorable for heat to radiates in the in-plane direction. In this study, densified spherical h-BN (sph-BN) microspheres, composed of as-synthesized nano-sized h-BN (nano-BN), were manufactured by a spray-drying process with variations in organic and/or inorganic binders followed by sintering. After incorporating various sph-BN particles as fillers into polydimethylsiloxane (PDMS), the through-plane thermal conductivity of composites embedded with sph-BN, assisted by a sodium silicate binder, enhanced the highest through-plane and in-plane thermal conductivities. The composites exhibited high thermal isotropy (through-plane thermal conductivity/in-plane thermal conductivity: lambda perpendicular to/lambda//${\lambda }_ \bot /{\lambda }_{//}$) of 0.77. The out-of-plane thermal conductivity of the composites was remarkably enhanced by over 2000% compared with pristine PDMS, which can be attributed to the synergy combined with the synthesis of the densified spherical BN initiated by nano-BN, sintering, and the application of inorganic binders. This study proposes a simple method to prepare polymer composites with h-BN that exhibit high through-plane thermal conductivity and are promising materials for heat removal in electronics.
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