SiC陶瓷在钎焊过程中的6H到3C多型相变

人工晶体学报 ›› 2023, Vol. 52 ›› Issue (8): 1516-1522.

SiC陶瓷在钎焊过程中的6H到3C多型相变

石浩江¹, 张瑞谦¹, 李鸣¹, 颜家振², 刘自豪², 白冬²

1.中国核动力研究设计院,反应堆燃料及材料国家重点实验室,成都 610213;
2.四川大学机械工程学院,成都 610065

收稿日期:2023-01-03 出版日期:2023-08-15 发布日期:2023-08-21

6H to 3C Polytypic Transformation in SiC Ceramics During Brazing Process

SHI Haojiang¹, ZHANG Ruiqian¹, LI Ming¹, YAN Jiazhen², LIU Zihao², BAI Dong²

1. State Key Laboratory of Reactor Fuel and Materials, Nuclear Power Institute of China, Chengdu 610213, China;
2. School of Mechanical Engineering, Sichuan University, Chengdu 610065, China

Received:2023-01-03 Online:2023-08-15 Published:2023-08-21
Contact: YAN Jiazhen, doctor, associate professor. E-mail: yanjiazhen@scu.edu.cn
About author:SHI Haojiang(1994—), male, from Sichuan province, doctor, assistant research fellow. E-mail: myzxshj@126.com
Supported by:
Research on Accident Tderant Fuel Technology for Nuclear Power (Phase Ⅱ)

摘要/Abstract

摘要： 为探究钎焊过程对SiC陶瓷晶体结构的影响,为钎焊工艺设计提供理论及试验数据支撑,本研究采用纯Ni箔作为中间层在1 100~1 245 ℃下实现了6H-SiC的钎焊连接,并研究了焊缝以及6H-SiC基体与焊缝界面处的微观形貌。研究结果表明,少量Ni原子在钎焊过程中会扩散进入6H-SiC陶瓷,并以固溶形式存在,降低了6H-SiC层错能。随着钎焊温度升高,6H-SiC/焊缝界面处的焊后残余应力增大,当钎焊温度达到1 245 ℃时,界面处的6H-SiC的(0001)面沿1/3 <1100>方向产生滑移, 6H-SiC切变形成3C-SiC。因此,SiC陶瓷在钎焊过程中受应力和钎料组成元素的作用发生相变,针对特殊环境使用的SiC陶瓷需要斟酌钎焊工艺对其晶体结构及性能的影响。

关键词: 6H-SiC, 3C-SiC, 相变, 钎焊, 残余应力

Abstract: In this paper, pure Ni foil was used as an intermediate layer to achieve brazing connection of 6H-SiC at 1 100~1 245 ℃. The microstructure of the brazed joint and the interface between the brazed joint and the 6H-SiC substrate were studied to investigate the effect of brazing process on the crystal structure of SiC ceramics and provide theoretical and experimental data supports for brazing process design. The results show that a small amount of Ni atoms diffuse into the 6H-SiC ceramics during the brazing process and exist in solid solution form, which reduces the dislocation energy of 6H-SiC. The residual stress at the 6H-SiC/brazed joint interface increases with the increase of brazing temperature, and when the brazing temperature reaches 1 245 ℃, the (0001) plane of 6H-SiC at the interface slips along the 1/3 <1100> direction, and the 6H-SiC is sheared to form 3C-SiC. Therefore, SiC ceramics can undergo phase transformation under the influence of stress and brazing material composition during the brazing process, and the effect of brazing process on their crystal structure and properties should be considered for SiC ceramics used in special environments.

Key words: 6H-SiC, 3C-SiC, phase transformation, brazing, residual stress

中图分类号:

O469

石浩江, 张瑞谦, 李鸣, 颜家振, 刘自豪, 白冬. SiC陶瓷在钎焊过程中的6H到3C多型相变[J]. 人工晶体学报, 2023, 52(8): 1516-1522.

SHI Haojiang, ZHANG Ruiqian, LI Ming, YAN Jiazhen, LIU Zihao, BAI Dong. 6H to 3C Polytypic Transformation in SiC Ceramics During Brazing Process[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2023, 52(8): 1516-1522.

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