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, cilt.23, sa.5, ss.1304-1313, 2013 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 23 Sayı: 5
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/s1003-6326(13)62598-4
  • Dergi Adı: TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1304-1313
  • Anahtar Kelimeler: AlN, ceramic-matrix composites, thermal properties, liquid metal infiltration, MECHANICAL-PROPERTIES, YOUNGS MODULUS, MG ALLOYS, CONDUCTIVITY, BEHAVIOR, EXPANSION, MICROSTRUCTURE, MORPHOLOGY, EVOLUTION, PHASE
  • Anadolu Üniversitesi Adresli: Evet

Özet

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.