Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1620510 | Journal of Alloys and Compounds | 2010 | 6 Pages |
Abstract
Thermal conductivity, electrical, and mechanical properties of aluminum nitride (AlN) ceramics doped with Y2O3 and CaO and using a conventional MoSi2 heating element furnace were investigated. Relative densities of over 98% of the theoretical values show that the critical sintering temperature for AlN densification may be as low as 1650 °C. An AlN ceramic with 1 wt.% Y2O3 and 1 wt.% CaO fired at 1700 °C for 3 h has a thermal conductivity of 110 W mâ1 Kâ1 and a Vicker's hardness of 1053 kg mmâ2. Its dielectric constant and loss factor are 9.97 and 1.1 Ã 10â3 at 1 MHz, respectively. Microprobe observations of the test samples reveal that the thermal conductivities are related to the secondary phase composition and elemental distribution at grain boundaries and the oxygen content of sintered AlN.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Chih-Peng Lin, Ya-Min Hsieh, Chih-Hung Chu,