Effects of Al addition on the microstructure and properties of Nb/Nb5Si3in situ composites fabricated via spark plasma sintering
Effects of Al addition on the microstructure and properties of Nb/Nb5Si3in situ composites fabricated via spark plasma sintering
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DOI：
10.1007/s11595-014-1039-8
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
W. Long;Junping Yao;Z. Fu
中科院分区：
文献类型：
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作者：
W. Long;Junping Yao;Z. Fu
以Nb、Si和Al元素粉末为原料，采用放电等离子烧结技术制备了致密Nb/Nb 5Si 3复合材料。通过扫描电子显微镜、X射线衍射和电子探针分析了合成复合材料的微观结构。结果表明，复合材料由残余Nb颗粒相和Nb 5Si 3相组成。Al的加入对Nb/Nb 5Si 3原位复合材料的显微组织有明显的影响，促进了Al 3 Nb 10 Si 3相的形成。此外，复合材料的洛氏硬度随着Al添加量的增加而降低。Nb-20 Si的洛氏硬度为60 HRC，当Al含量增加到15at%时，其降低到约52.7HRC。Nb/Nb 5Si 3原位复合材料的抗氧化性能随Al含量的增加而显著提高。
Dense Nb/Nb5Si3composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructures 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 Nb5Si3phase. The microstructure of the Nb/Nb5Si3in situcomposites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3phase. In addition, the Rockwell hardness of the composites decreased with the increase in Al 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/Nb5Si3in situcomposites significantly improved with the increase in Al addition.