Nb对Zr基钎料及钎焊连接SiC陶瓷的影响

doi:10.11896/cldb.20090283

材料导报

2022, Vol. 36

Issue (3): 20090283-5 https://doi.org/10.11896/cldb.20090283

无机非金属及其复合材料

Nb对Zr基钎料及钎焊连接SiC陶瓷的影响

蔡雨晨¹, 冯可芹¹, 周博芳^1,2, 陈思潭¹

1 四川大学机械工程学院,成都 610065
2 湖北汽车工业学院材料科学与工程学院,湖北十堰 442002

Effect of Nb on Zr-based Filler and Brazing SiC Ceramics

CAI Yuchen¹, FENG Keqin¹, ZHOU Bofang^1,2, CHEN Sitan¹

1 School of Mechanical Engineering, Sichuan University, Chengdu 610065, China
2 School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002,Hubei,China

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摘要研究在Zr-20Cu钎料基础上添加元素Nb对钎料及SiC陶瓷钎焊接头微观结构和力学性能的影响。结果表明:添加Nb后钎料的相组成物主要是α-Zr、β-Zr、β-Nb和CuZr₂,且随着Nb含量增加,晶界处的大尺寸第二相CuZr₂不断减少,从而提高了钎料的耐腐蚀性;添加Nb钎料可有效地填充SiC陶瓷之间的间隙,且钎焊接头中无孔隙和裂缝;钎焊接头处形成了一定厚度的界面反应层,生成物质主要有ZrC、Zr₂Si、Nb₂C和Nb₅Si₃;Nb₂C和Nb₅Si₃可降低钎焊接头的脆性,其与Nb的固溶强化共同作用,提高了接头的剪切强度。当Nb含量较低时,SiC陶瓷接头的剪切强度随Nb含量(0%~10%,质量分数,下同)的增加而提高,其中Nb含量为10%时,接头断口处存在大量韧窝,接头强度达到最大值(86 MPa);但当Nb含量继续增加到15%时,由于Nb过量导致钎料熔点升高,使得接头剪切强度有所降低。

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	蔡雨晨
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关键词: 碳化硅陶瓷锆铜铌钎料钎焊微观结构剪切强度

Abstract: The effect of Nb addition in Zr-20Cu filler metal on the microstructure and properties of the filler metal and SiC ceramic brazing joints was studied. The results show that adding Nb to the brazing filler metal can obtain a good joint. The filler metal is composed of α-Zr, β-Zr, β-Nb, and CuZr₂. Among them, CuZr₂ decreases as Nb increases, thereby improving the corrosion resistance of the filler metal. Moreover, the filler metal can fill the gap between SiC ceramics without pores and cracks. After brazing, an interface reaction layer forms at the joint which mainly contains ZrC, Zr₂Si, Nb₂C and Nb₅Si₃. In addition, Nb₂C and Nb₅Si₃ can reduce the brittleness of joints which work together with the solid solution strengthening of Nb to improve the shear strength of the joint. When the Nb content is between 0% and 10%, the shear strength heightens with the increase of Nb content. And it reaches the maximum when the Nb content is 10%, which is approximately 86 MPa. At the same time, a large number of dimples generate at the fracture. However, when the Nb content is added to 15%, the melting point of the filler metal increases, which makes the shear strength decline.

Key words: sillicon carbide ceramic zirconium-copper-niobium filler metal brazing microstructure shear strength

发布日期: 2022-02-10

ZTFLH:

TG454

基金资助: 四川省科技计划项目(2019YFG0225)

通讯作者: kqfeng@scu.edu.cn

作者简介: 蔡雨晨,四川大学,硕士研究生。目前主要研究方向为碳化硅陶瓷的钎焊连接。
冯可芹,四川大学,教授,博士研究生导师。主要从事金属-陶瓷复合材料、钒钛资源综合利用、外场辅助材料的合成与制备、材料制备和冶金过程的物理化学等方面的研究。先后在国内外核心学术期刊上发表学术论文140余篇,其中SCI收录53篇,EI收录82篇。

引用本文:

蔡雨晨, 冯可芹, 周博芳, 陈思潭. Nb对Zr基钎料及钎焊连接SiC陶瓷的影响[J]. 材料导报, 2022, 36(3): 20090283-5.
CAI Yuchen, FENG Keqin, ZHOU Bofang, CHEN Sitan. Effect of Nb on Zr-based Filler and Brazing SiC Ceramics. Materials Reports, 2022, 36(3): 20090283-5.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.20090283 或 http://www.mater-rep.com/CN/Y2022/V36/I3/20090283

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