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	Oxidation behavior and mechanical property of Si/sub 3/N/sub 4 / ceramics with rare earth oxide addition
	Xuguang Tong ; Jianbao Li ; Hong Lin ; Xiaozhan Yang ; Jun Yang
	2010-05-10 ; 2010-05-10
关键词	Experimental/ ceramics crystal microstructure lanthanum compounds lutetium compounds mechanical properties oxidation scanning electron microscopy silicon compounds X-ray diffraction/ oxidation behavior mechanical property rare earth oxide addition microstructure hot-pressing sintered Si/sub 3/N/sub 4/ ceramics SEM scanning electron microscopy XRD X-ray diffraction EDS oxidation resistance 25 MPa 1400 C 1800 C 1 h 100 h Si/sub 3/N/sub 4/ Lu/sub 2/O/sub 3/ La/sub 2/O/sub 3/ SiO/sub 2/ Re/sub 2/Si/sub 2/O/sub 7/ Re/sub 2/SiO/sub 5// A8140 Treatment of materials and its effects on microstructures and properties A8160D Surface treatment and degradation of ceramics and refractories A6220 Mechanical properties of solids (related to microscopic structure) A6480G Microstructure A6116D Electron microscopy determinations of structures/ pressure 2.5E+07 Pa temperature 1.67E+03 K temperature 2.07E+03 K time 3.6E+03 s time 3.6E+05 s/ Si3N4/bin Si3/bin N4/bin Si/bin N/bin Lu2O3/bin Lu2/bin Lu/bin O3/bin O/bin La2O3/bin La2/bin La/bin O3/bin O/bin SiO2/bin O2/bin Si/bin O/bin Re2Si2O7/ss Re2/ss Si2/ss O7/ss Re/ss Si/ss O/ss Re2SiO5/ss Re2/ss O5/ss Re/ss Si/ss O/ss
中文摘要	The effects of rare earth oxides (Lu/sub 2/O/sub 3/ and La/sub 2/O/sub 3/) on the property, microstructure and oxidation behavior of hot-pressing sintered Si/sub 3/N/sub 4/ ceramics were investigated. The silicon nitride ceramics with Lu/sub 2 /O/sub 3/ and La/sub 2/O/sub 3/ as addition have been fabricated by hot-pressed at 1800 degrees C for 1 h under a pressure of 25 MPa. Oxidation test was carried out at 1400 degrees C in air for 100 hours. Mechanical properties, SEM and XRD were measured before and after oxidation. The results showed that Si/sub 3/N/sub 4/ ceramics doped with Lu/sub 2/O/sub 3/ had good microstructure and mechanical properties than those doped with La/sub 2/O/sub 3/. Oxidation test showed a parabolic weight gain with oxidation time at 1400 degrees C in air and the oxidation products of the ceramics were SiO /sub 2/, Re/sub 2/Si/sub 2/O/sub 7/ and Re/sub 2 /SiO/sub 5/ confirmed by XRD and EDS. The rate-controlling step was the diffusion of ion. The samples doped with Lu/sub 2/O /sub 3/ showed superior oxidation resistance than to those doped with La/sub 2/O/sub 3/.
语种	英语 ; 英语
出版者	Trans Tech Publications ; Switzerland
内容类型	期刊论文
源URL	[http://hdl.handle.net/123456789/20450]
专题	清华大学
推荐引用方式 GB/T 7714	Xuguang Tong,Jianbao Li,Hong Lin,et al. Oxidation behavior and mechanical property of Si/sub 3/N/sub 4 / ceramics with rare earth oxide addition[J],2010, 2010.
APA	Xuguang Tong,Jianbao Li,Hong Lin,Xiaozhan Yang,&Jun Yang.(2010).Oxidation behavior and mechanical property of Si/sub 3/N/sub 4 / ceramics with rare earth oxide addition..
MLA	Xuguang Tong,et al."Oxidation behavior and mechanical property of Si/sub 3/N/sub 4 / ceramics with rare earth oxide addition".(2010).

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