Al2O3陶瓷与GH3536真空钎焊接头界面组织与力学性能

杨斯媛; 王颖; 王纪来; 杨振文; 王东坡

doi:10.7527/S1000-6893.2021.25806

航空学报 >

2022 , Vol. 43 >Issue 4: 525806 - 525806

DOI: https://doi.org/10.7527/S1000-6893.2021.25806

论文

Al₂O₃陶瓷与GH3536真空钎焊接头界面组织与力学性能

杨斯媛 ,
王颖 ,
王纪来 ,
杨振文 ,
王东坡

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天津大学天津市现代连接技术重点实验室, 天津 300354

收稿日期: 2021-05-13

修回日期: 2021-05-20

网络出版日期: 2021-06-01

基金资助

国家自然科学基金（51875400）；天津市科技计划（19ZXJRGX00100）

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Interfacial microstructure and mechanical properties of vacuum-brazed Al₂O₃ ceramic and GH3536 joint

YANG Siyuan ,
WANG Ying ,
WANG Jilai ,
YANG Zhenwen ,
WANG Dongpo

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Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin 300354, China

Received date: 2021-05-13

Revised date: 2021-05-20

Online published: 2021-06-01

Supported by

National Natural Science Foundation of China (51875400); Science and Technology Program of Tianjin (19ZXJRGX00100)

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摘要

采用Ag-5.0Cu-1.0Al-1.25Ti银基钎料通过真空钎焊的方法实现了Al₂O₃陶瓷与镍基高温合金GH3536的连接。为明确钎焊接头的界面形成机理，通过扫描电子显微镜和X射线衍射分析的测试方法研究了接头的界面组织结构与物相组成。同时探究了钎焊温度与保温时间对接头微观组织与力学性能的影响规律，从而实现工艺参数的优化。研究表明：在钎焊温度为970℃，保温时间为10 min的条件下，Al₂O₃/GH3536钎焊接头的典型界面组织为Al₂O₃/Ti₃（Cu，Al）₃O/Ag （s，s）+AlCu₂Ti/TiNi₃+TiFe₂/GH3536，其接头的抗剪强度最高可达到194±10 MPa。随着钎焊温度的升高和保温时间的延长，Ti₃（Cu，Al）₃O反应层的厚度增加，钎缝中的富Cu相减少，AlCu₂Ti化合物的数量增加且发生聚集长大现象。当钎焊温度过高或保温时间过长时，钎缝中的银基固溶体被大量的AlCu₂Ti化合物所替代，化合物的聚集和长大导致接头的力学性能显著降低。最后，分析了接头的失效机制，在剪切力的作用下，接头的断裂主要发生在Al₂O₃陶瓷与Ti₃（Cu，Al）₃O反应层的界面处以及Al₂O₃陶瓷基体上。

关键词： 真空活性钎焊; 镍基高温合金; AgCuAlTi钎料; 氧化铝陶瓷; 抗剪强度

本文引用格式

杨斯媛 , 王颖 , 王纪来 , 杨振文 , 王东坡 . Al₂O₃陶瓷与GH3536真空钎焊接头界面组织与力学性能[J]. 航空学报, 2022 , 43(4) : 525806 -525806 . DOI: 10.7527/S1000-6893.2021.25806

Abstract

A silver-based active brazing filler alloy Ag-5.0Cu-1.0Al-1.25Ti was used to join Al₂O₃ ceramic and nickel-based superalloy (GH3536) by vacuum brazing. To clarify the formation mechanism of the interface of the brazed joint, the interfacial microstructure and phases composition of the joint were studied by scanning electron microscopy and X-ray diffraction analysis. Meanwhile, the effect of brazing temperature and holding time on the microstructure and mechanical properties of the joint was also analyzed, so as to optimize the brazing parameters. The results showed that the typical microstructure of the Al₂O₃/GH3536 joint obtained at 970℃ for 10 min was Al₂O₃/Ti₃(Cu,Al)₃O/Ag(s,s)+AlCu₂Ti/TiNi₃+TiFe₂/GH3536, and the maximum shear strength of the joint could reach 194 ±10 MPa. With the increase of brazing temperature and holding time, the thickness of Ti₃(Cu,Al)₃O reaction layer increased, the Cu-rich phase gradually decreased, and AlCu₂Ti compounds aggregated. However, the brazing temperature was too high or the holding time was too long, the silver matrix in the brazing seam was replaced by a large amount of AlCu₂Ti compound, which resulted in a significant decrease in the mechanical properties of the joint. Finally, the failure mechanism of the joint was analyzed. Under the action of shear force, the fracture of the joint occurred mainly at the interface of Al₂O₃ ceramic and Ti₃(Cu,Al)₃O reaction layer and the Al₂O₃ ceramic substrate.

Key words： vacuum active brazing; nickel-based superalloy; AgCuAlTi brazing; alumina ceramic; shear strength

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