Thermal properties of pressureless melt infiltrated AlN-Si-Al composites

Ayse Kalemtas*, Gulsum Topates, Ozlem Bahadir, Pinar Kaya Isci, Hasan Mandal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Thermal properties of AlN-Si-Al composites produced by pressureless melt infiltration of Al/Al alloys into porous α-Si3N4 preforms were investigated in a temperature range of 50-300 C. SEM and TEM investigations revealed that the grain size of AlN particles was less than 1 μm. In spite of sub-micron grain size, composites showed relatively high thermal conductivity (TC), 55-107 W/(m.K). The thermal expansion coefficient (CTE) of the composite produced with commercial Al source, which has the highest TC of 107 W/(m.K), was 6.5×10-6 K-1. Despite the high CTE of Al (23.6×10-6 K-1), composites revealed significantly low CTE through the formation of Si and AlN phases during the infiltration process.

Original languageEnglish
Pages (from-to)1304-1313
Number of pages10
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume23
Issue number5
DOIs
Publication statusPublished - May 2013
Externally publishedYes

Keywords

  • AlN
  • ceramic-matrix composites
  • liquid metal infiltration
  • thermal properties

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