Thermal properties of pressureless melt infiltrated AlN-Si-Al composites
Kalemtaş, Ayşe and Topateş, Gülsüm and Bahadır, Özlem and Kaya İşçi, Pınar and Mandal, Hasan (2013) Thermal properties of pressureless melt infiltrated AlN-Si-Al composites. Transactions of Nonferrous Metals Society of China, 23 (5). pp. 1304-1313. ISSN 1003-6326
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Official URL: http://dx.doi.org/10.1016/S1003-6326(13)62598-4
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.
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