Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1636830 | Transactions of Nonferrous Metals Society of China | 2013 | 10 Pages |
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 6.5Ã10â6 Kâ1. Despite the high CTE of Al (23.6Ã10â6 Kâ1), composites revealed significantly low CTE through the formation of Si and AlN phases during the infiltration process.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Ayse KALEMTAS, Gulsum TOPATES, Ozlem BAHADIR, Pinar KAYA ISCI, Hasan MANDAL,