Thermal conductivity of liquid-phase sintered silicon carbide ceramics: A review

Hyun Sik Kim, Young Wook Kim

Research output: Contribution to journalReview articlepeer-review

13 Scopus citations

Abstract

Silicon carbide (SiC) exhibits excellent thermal conductivity. Recently, thermal conductivity that amounts to 261.5 W/m-K has been obtained in polycrystalline SiC ceramic liquid-phase sintered (LPS) with Y2O3-Sc2O3 additives at 2050 °C under a nitrogen atmosphere. From the additive used to the sintering atmosphere selected, many factors affect the thermal conductivity of the SiC. In this review, important factors that are known to determine the thermal conductivity of LPS-SiC (lattice oxygen/nitrogen content, porosity, grain size, grain boundary structure, phase transformation, and additive composition) have been evaluated. While reviewing the impact of each factor on thermal conductivity, hidden correlations among different factors are also discussed. Among the factors that are claimed to be important, we suggest a few factors that are more critical to thermal conductivity than others. Based on the most critical factors on the thermal conductivity of LPS-SiC, a complete engineers’ guide for high thermal conductivity LPS-SiC is proposed.

Original languageEnglish
Pages (from-to)3855-3874
Number of pages20
JournalJournal of the European Ceramic Society
Volume43
Issue number9
DOIs
StatePublished - Aug 2023

Keywords

  • Additive composition
  • Liquid-phase sintering
  • Phonon
  • Silicon carbide
  • Thermal conductivity

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