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 language | English |
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Pages (from-to) | 1304-1313 |
Number of pages | 10 |
Journal | Transactions of Nonferrous Metals Society of China (English Edition) |
Volume | 23 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 2013 |
Externally published | Yes |
Keywords
- AlN
- ceramic-matrix composites
- liquid metal infiltration
- thermal properties