烧结温度对放电等离子烧结Nb / Nb5Si3复合材料显微结构的影响
Effect of Sintering Temperature on Microstructure of Nb / Nb5Si3 Composite Prepared by Spark Plasma Sintering
林志斌, 龙文元, 尧军平, 张 磊
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作者单位：(南昌航空大学 航空制造工程学院, 江西 南昌 330063)
中文关键字：放电等离子烧结； 烧结温度； Nb/Nb5Si3复合材料； 显微组织
英文关键字：spark plasma sintering; sintering temperature; Nb/Nb5Si3 composite; microstructure
中文摘要：采用放电等离子烧结技术，分别在1500、1600、1680 ℃下对Nb-20Si试样进行烧结，研究了烧结温度对Nb/Nb5Si3复合材料显微结构的影响。结果表明，烧结温度高于1500 ℃时，烧结试样由Nb和Nb5Si3两相组成；随烧结温度的升高，烧结试样中Nb颗粒尺寸减小，试样致密度逐渐增大；烧结温度为1680 ℃时，显微组织中出现大量Nb+Nb5Si3共晶组织。
英文摘要：Nb-20Si samples were prepared by spark plasma sintering at 1500 ℃, 1600 ℃ and 1680 ℃, the effects of sintering temperature on the microstructure of Nb/Nb5Si3 composite were investigated. The results show that the alloy (T≥1500 ℃) consists of Nb and Nb5Si3. With the increase of sintering temperature, the size of Nb particle obviously decreases, the density of the composite is improved. A lot of (Nb+Nb5Si3) eutectic appears in the composite when sintering at 1680 ℃