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以Nb,Si粉末为原料,采用放电等离子烧结(SPS)技术,原位合成了密实的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)等手段对材料的组织结构进行了分析,并探讨了材料的结构形成机制。结果表明,合成的材料由近球状的Nb颗粒与Nb-Nb5Si3共晶组织组成;SPS过程中产生的放电等离子体使Si粉及Nb颗粒的表面熔化,熔融的Nb和Si在冷却过程中发生共晶反应而形成Nb-Nb5Si3共晶体,而未反应完的Nb颗粒则均匀分布在共晶组织中。
Using Nb and Si powders as raw materials, solid-state Nb / Nb5Si3 composites were synthesized by spark plasma sintering (SPS). The microstructure of the material was analyzed by scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD). The formation mechanism of the material was also discussed. The results show that the synthesized material consists of near-spherical Nb particles and Nb-Nb5Si3 eutectic microstructure. The discharge plasma generated during the SPS process melts the surface of Si powder and Nb particles, and the molten Nb and Si co-occur during cooling The Nb-Nb5Si3 co-crystal is formed by the reaction of crystals, while the unreacted Nb particles are uniformly distributed in the eutectic structure.