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《Fiber Reinforced Plastics/Composites》 2007-02
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EFFECT OF EXTERNAL REACTANTS ON GROWTH OF Al_2O_3 FIBER AMONG Al_2O_(3(f))/Ti-Al COMPOSITES IN-SITU

WANG Fen,LI Meng(School of Material Science and Engineering,Shanxi University of Science & Technology,Xianyang of Shanxi Prov.712081,China)  
Ti-Al intermetallic matrix composite with interpenetrating Al2O3 whiskers was fabricated in situ through heat-treating the prefabricated pieces consisting of titanium,aluminum and external reactant powders at partial-oxidizing atmosphere.The phase composition and the microstructure were analyzed by XRD and SEM.At the same time,thermodynamic analysis was discussed according to DTA results.It was found that Al2O3(f)/Ti-Al composites in-situ had been synthesized in each of Ti-Al-Nb2O5,Ti-Al-La2O3 and Ti-Al-Kaolin systems.However,Al2O3 fibers grew in different forms.Al2O3 fiber in Ti-Al-Nb2O5 system was formed by alumino-thermic reaction mainly and aluminum fiber in the others was gradually oxidating into Al3O2 fiber.Alumino-thermic reaction was going on quickly with a great quantity of heat released,which made Al2O3 fiber tenuous and glomerating together.In comparison,much thicker fiber spread around matrix through gradual oxidation in Ti-Al-La2O3 and Ti-Al-Kaolin systems.
【Fund】: 国家自然科学基金资助项目(50372037)
【CateGory Index】: TB333
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