以Nb,Si粉为原料,采用放电等离子烧结(SPS)技术,原位合成了近理论密度的Nb/Nb5Si3复合材料.利用扫描电镜(SEM)、电子探针微区分析(EPMA)和X射线衍射(XRD)分析了材料的组织结构;通过对SPS过程中不同阶段试样的液淬分析,探讨了复合材料的结构形成机理.结果表明,制备的复合材料由Nb和原位合成的Nb5Si3两相组成,Nb以颗粒状均匀分布在Nb5Si3基体上;Nb5Si3是在Nb,Si颗粒的界面开始反应合成的,随着SPS过程的进行,界面反应不断发生,直至反应物中的Si粉完全转变为Nb5Si3.
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