摘要
以Nb、Si粉末为原料,采用放电等离子烧结(SPS)技术,原位合成Nb/Nb5Si3复合材料,研究了烧结温度对材料组织结构的影响。结果表明,Nb/Nb5Si3复合材料的反应SPS烧结存在一个临界烧结温度Tc=1400℃;当烧结温度低于Tc时,合成的材料致密性较低,且存在Nb3Si中间相;当烧结温度高于Tc时,可获得所需的Nb/Nb5Si3复合材料,而且随着烧结温度的提高,Nb颗粒尺寸变小,材料的致密性高达99.59%。
Taking the use of Nb and Si elemental powders as raw materials, Nb/Nb5Si3 composites were successfully fabricated by spark plasma sintering (SPS) technology. The effect of sintering temperatures on microstructures of the synthesized composites was investigated. The results show that there exists a critical sintering temperature Tc(1400°C) in the synthesis of Nb/Nb5Si3 composites by SPS technology. When sintering temperature is lower than Tc, an intermediate Nb3Si phase is formed in the fabricated samples, and the relative density of the samples is lower. Only if the sintering temperature is higher than Tc, the intermediate Nb3Si phase is thoroughly eliminated, Nb particles becomes finer size and the desired Nb/Nb5Si3 composites with relative density of 99.59% is achieved.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2005年第6期45-48,共4页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金资助项目(50276023)
