Growth and microstructure of AlN whiskers and dendrites |
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Affiliation: | 1. Department of Materials Physics, University of Science and Technology Beijing, Beijing 100083, China;2. Department of Materials, Tsinghua University, Beijing 100084, China;3. School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia |
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Abstract: | AlN whiskers or dendrites were synthesized with a sublimation-recrystallization method by using Al, AlN powders and some additives as raw materials. Whiskers with different sizes that featured high purity and good crystallinity were obtained by controlling temperature and gas supersaturation in the reaction container. The whiskers were described as long and straight single crystals of approximately 1-30 (m in diameter by the centimeter range in length. However, AlN dendrites were about 1 mm in diameter by 0.5 cm in length, and showed an obviously preferential growth orientation, i.e., perpendicular to and planes. It is concluded that the whiskers or dendrites grow via the vapor-solid mechanism. |
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Keywords: | aluminum nitride whiskers dendrites sublimation-recrystallization method |
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