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Effects of Al Addition on the Microstructure and Properties of nb/nb_5si_3 in situ composites Fabricated via Spark Plasma sintering

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Journal of Wuhan University of Technology(Materials Science) 2014年第5期29卷 1036-1038页

作者：龙文元 YAO Junping FU Zhengyi College of Aeronautical Manufacuring Engineering Nanchang Hangkong University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Dense nb/nb5si3 composites were fabricated via spark plasma sintering technology using nb, si, and Al elemental powders as raw materials. The microstructttres of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual nb particle phase and nb5si3 phase. The microstructure of the nb/ nb5si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3nb10si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in AI additions. The Rockwell hardness of nb-20si is 60HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the nb/nbssi3 in situ composites significantly improved with the increase in Al addition.

关键词： spark plasma sintering nb/nb5si3 composites oxidation resistance microstructure

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Fabrication and Microstructure Evolution of Niobium-Niobium silicide composites by Spark Plasma sintering

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Journal of Wuhan University of Technology(Materials Science) 2007年第2期22卷 299-302页

作者：陈哲严有为 State Key Lab of Die & Mould Technology Huazhong University of Science & Technology

By using nb and si elemental powders as raw materials, dense nb/nbssi3 composites were successfully fabricated by a spark plasma sintering （SPS） technology. The microstructure of the fabricated composites was analyzed by OM, SEM, XRD and EPMA; the microstructure evolution of the composites was also investigated by a quenching test. The experimental results show that the prepared composites consist of nb and nb5si3 phases; nb particle uniformly distributes in the in-situ synthesized nb5si3 matrix. During the SPS process, an interfacial reaction occurs between nb and si particles to synthesize nb5si3 until reactant silicon has been completely depleted.

关键词： spark plasma sintering nb/nb5si3 composites fabrication microstructure evolution

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