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粉末冶金材料科学与工程  2023, Vol. 28 Issue (3): 244-253    DOI: 10.19976/j.cnki.43-1448/TF.2023015
  工艺技术 本期目录 | 过刊浏览 | 高级检索 |
料浆烧结法制备铌基Y2O3涂层的组织及抗热震性能
蔺仕琦, 袁铁锤, 王飞
中南大学 粉末冶金国家重点实验室,长沙 410083
Microstructure and thermal shock resistance of Nb/Y2O3 coating prepared by slurry sintering
LIN Shiqi, YUAN Tiechui, WANG Fei
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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摘要 为推动核工业乏燃料回收再利用,满足熔炼核金属用坩埚的多轮次有效服役的要求,本文采用料浆烧结工艺在Nb-5W-2Mo-1Zr(Nb521)合金表面制备一系列双层复合Y2O3涂层,添加微量Si、Mo作增强剂,表面均为纯Y2O3涂层。借助有限元模拟、X射线衍射仪、扫描电镜、能谱仪等手段分析涂层的组织及抗热震性能。结果表明:Nb/Y2O3涂层呈典型的层状结构,由不规则的粉末颗粒相互堆叠而成,基体区、扩散区、过渡层、纯Y2O3层结构分明;有限元模拟计算及实验结果均证明双层梯度涂层可改变应力分布并有效减缓热冲击时材料内部应力的产生,其中,70%Y2O3+22%Nb+6%Si+2%Mo(7022)涂层的最大主应力为163.2 MPa,相较单层Y2O3涂层(313.4 MPa)下降47.93%。60次热循环后,7022-Y2O3涂层显微组织致密,无明显缺陷产生,形貌受损最少。
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蔺仕琦
袁铁锤
王飞
关键词 氧化钇涂层Nb-5W-2Mo-1Zr合金料浆烧结法抗热震性能金属/陶瓷涂层    
Abstract:For the reuse of crucibles used to smelt nuclear metals and the recovery of spent fuel, a series of double-layer gradient composite Yttria-coatings were prepared on the surface of Niobium 521 alloy by slurry sintering process. Trace amounts of Si and Mo were added as reinforcing agents in the coating, the surface of the coating was pure Y2O3. With the help of finite element simulation, X-ray diffractometer, scanning electron microscopy, energy spectrometer and other means, the microstructure and thermal shock resistance of the coating were studied. The results show that the Nb/Y2O3 coating has a typical layered structure, which is composed of irregular powder particles stacked on top of each other, and the matrix area, diffusion area, transition layer and Y2O3 layer have distinct structures. The finite element simulation calculation and experimental results both prove that the double-layer gradient coating can change the stress distribution and effectively reduce the stress generated inside the material during thermal shock. Among them, the maximum principal stress of the 70%Y2O3+22% Nb+6%Si+2%Mo (7022) coating is 163.2 MPa, which decreases by 47.93% compared to the single-layer Y2O3 coating (313.4 MPa). After 60 thermal cycles, the microstructure of the 7022-Y2O3 coating is dense without obvious defects, and the morphology is the least damaged.
Key wordsyttrium oxide coating    Nb-5W-2Mo-1Zr alloy    slurry sintering    thermal shock resistance    metal/ceramic coating
收稿日期: 2023-03-09      出版日期: 2023-07-06
ZTFLH:  TG113.23+3  
通讯作者: 袁铁锤,教授,博士。电话:0731-88830142;E-mail: tiechuiyuan@csu.edu.cn   
引用本文:   
蔺仕琦, 袁铁锤, 王飞. 料浆烧结法制备铌基Y2O3涂层的组织及抗热震性能[J]. 粉末冶金材料科学与工程, 2023, 28(3): 244-253.
LIN Shiqi, YUAN Tiechui, WANG Fei. Microstructure and thermal shock resistance of Nb/Y2O3 coating prepared by slurry sintering. Materials Science and Engineering of Powder Metallurgy, 2023, 28(3): 244-253.
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http://pmbjb.csu.edu.cn/CN/10.19976/j.cnki.43-1448/TF.2023015     或     http://pmbjb.csu.edu.cn/CN/Y2023/V28/I3/244
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