氧化铝复合材料

231Vol.23No.1 20092CHINESE JOURNAL OF MATERIALS RESEARCH February2009

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TB3321005-3093(2009)01-0059-05 CNTs reinfoced alumina ceramics prepared by hot pressing technology with ultra-fast heating rate based on combustion

reaction

HUANG Liwei FU Zhengyi∗∗MENG Fancheng

(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,

Wuhan University of Technology,Wuhan430070)

*Supported by National Natural Science Foundation of China No.50772081and Project Fund of Ministry of Education No.PCSIRT0644.Manuscript received June11,2008;in revised form November1,2008.

**To whom correspondence should be addressed:Tel:(027)87867824,E–mail:huangllww@ ABSTRACT A novel method for producing carbon nanotubes(CNTs)reinforced alumina ceramics was reported.The reaction heat generated by combustion was utilized as a high temperature source,and great mechanical pressure was applied when the combustion reaction wasfinished.When adding1%CNTs, the fracture toughness of the composites increased about50%compared with the pure alumina ceramics prepared in the same conditions.The results indicate that the sintering method is beneficial to protecting the CNTs from destruction.The toughening mechanisms are mainly CNTs pulled-out and CNTs bridging. KEY WORDS composites,carbon nanotubes,self-propagating combustion/quick pressing,toughening mechanism,mechanical properties

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Fig.1Schematic representation of sintering

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Fig.2Temperature-time curve during the combus-tion

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Fig.3(a)Raman spectrum and(b)scanning electron microscope of CNTs after heating and pressing

treatment