High thermal conductivity AlN by microwave sintering of a combustion synthesized AlN powder

Cheng Yu Hsieh, Shyan-Lung Chung

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report a study on fabrication of high thermal conductivity AlN by microwave sintering of combustion synthesized AlN powder. The raw AlN product was synthesized in our lab using SHS method. The AlN products thus obtained were ground to have an average particle size of under 2μm for sintering. Yttrium oxide was added to the AlN powder as sintering aid. The sintering was carried out in a single-mode cavity with microwave at 2.45 GHz. The specimens were sintered at a temperature ranging from 1800 to 1900° with a soaking time of 30 min to 3 hrs. The highest thermal conductivity of the as-sintered specimens could achieve 195 W/mK. The as-sintered specimens were then placed in the microwave cavity again and were reheated at 1800° for a time ranging from 30 min to 3 hrs. For the reheating, small amounts of carbon was added to the packing powder surrounding the specimens. After the reheating, the highest thermal conductivity of the specimens reached 235 W/mK. In this presentation, the role of the added carbon during the reheating process will be discussed.

Original languageEnglish
Title of host publicationProceedings of the 10th International Conference on Microwave and High Frequency Heating
PublisherMicrowave Application Group
Pages268-271
Number of pages4
ISBN (Electronic)8890180420, 9788890180422
Publication statusPublished - 2005
Event10th International Conference on Microwave and High Frequency Heating 2005 - Modena, Italy
Duration: 2005 Sep 122005 Sep 15

Other

Other10th International Conference on Microwave and High Frequency Heating 2005
CountryItaly
CityModena
Period05-09-1205-09-15

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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