龙文元,陈本隆,沈先君.碳纳米管增强Nb/Nb5Si3复合材料的组织和性能研究[J].稀有金属材料与工程,2018,47(7):2240~2244.[Long Wenyuan,Chen Benlong,Shen Xianjun.Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering[J].Rare Metal Materials and Engineering,2018,47(7):2240~2244.]
碳纳米管增强Nb/Nb5Si3复合材料的组织和性能研究
投稿时间:2016-06-12  修订日期:2016-07-23
中文关键词:  Nb/Nb5Si3复合材料  多壁碳纳米管  力学性能  放电等离子烧结(SPS)
基金项目:国家自然科学基金资助项目(项目号51271091);江西省教育厅科技项目(项目号GJJ12420)
中文摘要:
      采用放电等离子烧结法(SPS)原位合成了多壁碳纳米管(CNTS)增强Nb/Nb5Si3复合材料,研究了不同含量的碳纳米管对Nb/Nb5Si3复合材料的组织和性能的影响。研究表明:Nb/Nb5Si3复合材料的相组成主要为Nb、α-Nb5Si3和γ-Nb5Si3,当CNTS加入量达到2wt.%时开始出现了新相Nb4C3。复合材料的力学性能(压缩强度、断裂韧性)随着碳纳米管含量的增加而增加,加入2wt.%CNTs时达到最大值,压缩强度和断裂韧性提高幅度分别达到56%、31%;随后加入3wt.%CNTs时,压缩强度和断裂韧性都有所降低。复合材料断口的扫描电镜照片表明,复合材料的断裂模式主要为脆性解理断裂并有部分沿晶断裂,复合材料的增韧化作用主要是由于碳纳米管的拔出效应和桥联机制。
Study on the microstructure and properties of Nb/Nb5Si3 composites strengthened with CNTs by Spark Plasma Sintering
英文关键词:Nb/Nb5Si3 in-situ composites  MWCNTs  Mechanical properties  Spark Plasma Sintering
英文摘要:
      The Nb/Nb5Si3 In-Situ composite material strengthened with CNTs were prepared by Spark Plasma Sintering (SPS). The effects of CNTs content on microstructure and properties of Nb/Nb5Si3 in situ composites were investigated. The results show that the composite consists of Nb, α- Nb5Si3, and γ- Nb5Si3 phase. When adding over 2wt% CNTs, the new phase Nb4C3 was formed in the composites. The compressive strength and fracture toughness of composites increase obviously with increasing addition of CNTs. When the addition of CNTs is the 2wt%, the compressive strength and fracture toughness reached the maximum value and increased about 56%, 31% respectively. When the CNTs content added over 2wt%, the compressive strength fracture toughness decreased. The micrographs observed by SEM of fractography show the fracture appearance of the composites belongs to brittle cleavage fracture and partial intercrystalline fracture. The toughening mechanisms of composites are mainly due to the CNTs pullout and bridging.
作者单位E-mail
龙文元 南昌航空大学航空制造工程学院 long_weny@sohu.com 
陈本隆 南昌航空大学航空制造工程学院  
沈先君 上饶职业技术学院机械系  
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