wang-bulkhexagonal-2018.pdf (2.54 MB)
Bulk hexagonal boron nitride with a quasi-isotropic thermal conductivity
journal contribution
posted on 2018-07-11, 00:00 authored by Srikanth MatetiSrikanth Mateti, K Yang, X Liu, S Huang, Jiangting Wang, Luhua LiLuhua Li, Peter HodgsonPeter Hodgson, M Zhou, J He, Ying (Ian) ChenYing (Ian) ChenHexagonal boron nitride (BN) is electrically insulating and has a high in-plane thermal conductivity. However, it has a very low cross-plane thermal conductivity which limits its application for efficient heat dissipation. Here, large BN pellets with a quasi-isotropic thermal conductivity are produced from BN nanosheets using a spark plasma sintering (SPS) technique. The BN pellets have the same thermal conductivity from both perpendicular and parallel directions to the pellet surface. The high quasi-isotropic thermal conductivity of the bulk BN is attributed to a quasi-isotropic structure formed during the SPS process in which the charged BN nanosheets form large sheets in all directions under two opposite forces of SPS compression and electric field. The pellet sintered at 2300 °C has a very high cross-section thermal conductivity of 280 W m−1K−1(parallel to the SPS pressing direction) and exhibits superior heat dissipation performance due to more efficient heat transfer in the vertical direction.
History
Journal
Advanced functional materialsVolume
28Issue
28Article number
1707556Pagination
1 - 8Publisher
John Wiley & SonsLocation
Chichester, Eng.Publisher DOI
Link to full text
ISSN
1616-301XeISSN
1616-3028Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, WILEY-VCH Verlag GmbH & Co. KGaA, WeinheimUsage metrics
Categories
No categories selectedKeywords
hexagonal boron nitridenanosheetsquasi‐isotropic structurespark plasma sinteringthermal conductivityScience & TechnologyPhysical SciencesTechnologyChemistry, MultidisciplinaryChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedPhysics, Condensed MatterChemistryScience & Technology - Other TopicsMaterials SciencePhysicsquasi-isotropic structureSHEETS