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	Thermodynamics and kinetic considerations behind the growth of AIN whiskers synthesized by carbothermal reduction
	Fu, RL ; Zhou, HP ; Chen, KX ; Ferreira, JMF
	2010-05-10 ; 2010-05-10
会议名称	HIGH-PERFORMANCE CERAMICS III, PTS 1 AND 2 ; 3rd China International Conference on High-Performance Ceramics (CICC-3) ; Shenzhen, PEOPLES R CHINA ; Web of Science
关键词	aluminum nitride crystal growth thermodynamics kinetics ALUMINUM NITRIDE WHISKERS LOW SUPERSATURATION NITROGEN CRYSTALS MORPHOLOGIES MECHANISMS POWDERS AL2O3 Materials Science, Ceramics Materials Science, Composites
中文摘要	AlN whiskers have been successfully synthesized by carbothermal reduction. The thermodynamics and growth kinetics of AlN whiskers were studied at 1600degreesC using CaCO3 as a catalyst. The research indicated that AlN whiskers are more easily nucleated from the liquid phase than at the surface of solid phase. AlN whiskers are nucleated by VLS mechanism and the liquid, which plays a dominant role in the VLS mechanism, is formed by AlCa interphases, such as CaO.2Al(2)O(3) and CaO.6Al(2)O(3). Kinetic studies suggest that the catalyst reacts with Al2O3 to form a low melting point eutectic (1390degreesC). The liquid phase formed at this low melting point eutectic provides good conditions for nucleation of AlN whiskers. At the synthesis temperature, the liquid phase vaporizes, thus creating suitable conditions for the subsequent growing of whiskers by the VLS mechanism. This growing mechanism conforms to thermodynamics and a lot of proof indicates that screw dislocations play an important role in the process of the whiskers' formation.
会议录出版者	TRANS TECH PUBLICATIONS LTD ; ZURICH-UETIKON ; BRANDRAIN 6, CH-8707 ZURICH-UETIKON, SWITZERLAND
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18286]
专题	清华大学
推荐引用方式 GB/T 7714	Fu, RL,Zhou, HP,Chen, KX,et al. Thermodynamics and kinetic considerations behind the growth of AIN whiskers synthesized by carbothermal reduction[C]. 见:HIGH-PERFORMANCE CERAMICS III, PTS 1 AND 2, 3rd China International Conference on High-Performance Ceramics (CICC-3), Shenzhen, PEOPLES R CHINA, Web of Science.

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