龙文元,汪正飞

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

以Nb、Si、CNTs和Al粉末为原料,采用放电等离子烧结法(SPS)原位合成了Nb-20Si-2 mass%CNTs-xAl(x=0、1、2、3、4 mass%)复合材料。利用扫描电镜(SEM)、电子探针微区分析(EPMA)和X射线衍射(XRD)等对复合材料的组织结构进行了分析,研究了Al对CNTs增强Nb/Nb_5Si_3复合材料的组织和性能的影响。结果表明:Al能部分固溶于Nb_5Si_3和Nbss相中,多余的Al会与Nb反应生成AlNb_3相,较均匀地分布中Nb_5Si_3相中,并大部分聚集在Nb/Nb_5Si_3的界面处。Al元素的加入能明显改善Nb/Nb_5Si_3复合材料的断裂韧性,随着Al含量的增加,复合材料的断裂韧性先升高后降低,其中Al含量为2 mass%时达到最大值,即6.94 MPa·m~(1/2),相对于未加时提高了约56.9%。同时Al元素还能有效降低Nb/Nb_5Si_3复合材料高温氧化速度,提高高温抗氧化性能,而Al元素的加入量越高,其高温抗氧化性能越好。

关键词(KeyWords)： 放电等离子烧结;Nb/Nb_5Si_3原位复合材料;高温氧化;断裂韧性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51271091);; 江西省自然科学基金项目(20161BAB206107)

作者(Author): 龙文元,汪正飞

DOI: 10.13289/j.issn.1009-6264.2019-0428

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