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	Difference of mullite whiskers between ytterbia-doped aluminum hydroxide-silica gel and mechanochemical process
	Liang Long ; Li Jianbao ; Lin Hong ; Guo Gangfeng ; He Mingsheng
	2010-05-10 ; 2010-05-10
会议名称	JOURNAL OF RARE EARTHS ; 2nd International Conference on Rare Earth Research and Applications ; Honk Kong, PEOPLES R CHINA ; Web of Science
关键词	mullite whiskers ytterbia-doped gel mechanochemical rare earths MECHANICAL-PROPERTIES POWDERS Chemistry, Applied
中文摘要	A number of processing routes were developed for the synthesis of mullite whiskers. Mullite whiskers that were derived from ytterbia-doped aluminum hydroxide-silica gel were studied; another process for preparing mullite whiskers from Al2O3-SiO2 oxide mixtures by mechanochemical method was encountered by chance. The method of ytterbia-doped aluminum hydroxide-silica was used to enhance mullite formation from gel. For adding ytterbia, mullite formation can take place at 1000 degrees C and almost single-phase mullite can be achieved at 1150 degrees C, which is a significantly lower temperature than mechanochemical method. This enhancement of mullite formation is also attributed to refinement of aluminum hydroxide-silica by gel. Furthermore, well-developed single-crystal mullite whiskers were produced from the gel powder instead of normal-shaped grains. The presence of YbO might have promoted the formation of nanosized Al2O3 particles, which then acted as a template leading to mullite whiskers at higher sintering temperature.
会议录出版者	METALLURGICAL INDUSTRY PRESS ; BEIJING ; 2 XINJIEKOUWAI DAJIE, BEIJING 100088, PEOPLES R CHINA
语种	英语 ; 英语
内容类型	会议论文
源URL	[http://hdl.handle.net/123456789/18318]
专题	清华大学
推荐引用方式 GB/T 7714	Liang Long,Li Jianbao,Lin Hong,et al. Difference of mullite whiskers between ytterbia-doped aluminum hydroxide-silica gel and mechanochemical process[C]. 见:JOURNAL OF RARE EARTHS, 2nd International Conference on Rare Earth Research and Applications, Honk Kong, PEOPLES R CHINA, Web of Science.

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