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

KALEMTAŞ A., TOPATEŞ G., Bahadir O., Kaya Isci P., MANDAL H.

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA, vol.23, no.5, pp.1304-1313, 2013 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 5
  • Publication Date: 2013
  • Doi Number: 10.1016/s1003-6326(13)62598-4
  • Journal Name: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1304-1313
  • Keywords: AlN, ceramic-matrix composites, thermal properties, liquid metal infiltration, MECHANICAL-PROPERTIES, YOUNGS MODULUS, MG ALLOYS, CONDUCTIVITY, BEHAVIOR, EXPANSION, MICROSTRUCTURE, MORPHOLOGY, EVOLUTION, PHASE
  • Anadolu University Affiliated: Yes

Abstract

Thermal properties of AlN-Si-Al composites produced by pressureless melt infiltration of Al/Al alloys into porous alpha-Si3N4 preforms were investigated in a temperature range of 50-300 degrees C. SEM and TEM investigations revealed that the grain size of AlN particles was less than 1 gm. 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 6.5x10(-6) K-1. Despite the high CTE of Al (23.6x10(-6) K-1), composites revealed significantly low CTE through the formation of Si and AlN phases during the infiltration process.