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以Nb、Si和Ti粉末为原料,采用放电等离子烧结(SPS)技术对Nb-20Si、Nb-20Si-5Ti、Nb-20Si-15Ti和Nb-20Si-24Ti材料进行原位合成。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分析,探讨Ti对复合材料组织和性能的影响规律。结果表明,Ti元素的加入使得复合材料中Nb5Si3相转变成(Nb,Ti)5Si3,随着Ti加入量的增加,组织中出现了单质的Ti相,当Ti含量达到24%时,组织中还会出现Nb3Si相;同时Ti的加入会降低复合材料的硬度,提高其高温抗氧化性能。
In situ synthesis of Nb-20Si, Nb-20Si-5Ti, Nb-20Si-15Ti and Nb-20Si-24Ti materials was performed by spark plasma sintering (SPS) using Nb, Si and Ti powders as raw materials. The microstructure of the material was analyzed by scanning electron microscopy (SEM), electron probe microanalysis (EPMA) and X-ray diffraction (XRD) to explore the influence of Ti on the microstructure and properties of the composites. The results show that the addition of Ti element causes the transformation of Nb5Si3 phase to (Nb, Ti) 5Si3 in the composites. With the addition of Ti, the simplex Ti phase appears in the microstructure. When the Ti content reaches 24% Will appear Nb3Si phase; At the same time, the addition of Ti will reduce the hardness of composites and improve its high temperature oxidation resistance.