• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2025, Vol. 61 ›› Issue (8): 98-106.doi: 10.3901/JME.2025.08.098

• 材料科学与工程 • 上一篇    

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基于非均质中间层的AlN-Cu钎焊接头残余应力优化研究

王达达1, 徐海涛1, 刘平2, 金霞2, 闾川阳1, 贺艳明1   

  1. 1. 浙江工业大学化工机械设计研究所 杭州 310014;
    2. 浙江亚通新材料股份有限公司 杭州 310030
  • 收稿日期:2024-04-02 修回日期:2024-10-15 发布日期:2025-05-10
  • 作者简介:王达达,男,1999年出生。主要研究方向为异质材料界面行为调控。E-mail:q1439660879@163.com;贺艳明(通信作者),男,1984年出生,博士,博士研究生导师。主要研究方向为能源装备绿色制造技术;极端条件下材料或焊接结构服役寿命评价;机器学习辅助固态电池电解质设计。E-mail:heyanming@zjut.edu.cn
  • 基金资助:
    浙江省重点研发计划(2021C01178)、国家磁约束核聚变能发展研究专项(2019YFE03100400)和国家自然科学基金(52175368,52105162)资助项目。

Optimization of Residual Stress in AlN-Cu Brazing Joint Based on Heterogeneous Interlayer

WANG Dada1, XU Haitao1, LIU Ping2, JIN Xia2, Lü Chuanyang1, HE Yanming1   

  1. 1. Institute of Process Equipment and Control Engineering, Zhejiang University of Technology, Hangzhou 310014;
    2. Zhejiang Ya Tong Advanced Materials Co., Ltd., Hangzhou 310030
  • Received:2024-04-02 Revised:2024-10-15 Published:2025-05-10

摘要: 绝缘栅双极型晶体管(Insulated gate bipolar transistor, IGBT)是能源变换与传输的核心器件。由于过大的残余应力,其基板的连接成为该器件应用的主要阻碍。该研究就器件常用AlN-Cu基板的残余应力缓解问题展开研究。通过交织的金属丝嵌入接头来缓解残余应力,以力学试验、有限元模拟与力学原理系统地分析了复合结构钎料对残余应力的影响。结果表明,金属丝与焊缝外沿的距离是结构优化的关键参数,而丝数影响不大。在此基础上,通过对嵌入金属丝应力缓解机理的分析,确认了一种预应力效应,它可以使原始钎焊结构应力分布用于确认较优的嵌丝布置位置。这种结构设计方法使AlN-Cu的接头抗剪强度提升至245 MPa,相比无丝结构提高了37.6%,为IGBT基板残余应力的控制提供了一种简单有效的解决方案。

关键词: AlN-Cu接头, 钎焊, 预应力, 结构优化

Abstract: Insulated Gate Bipolar Transistor (IGBT) is a core device for energy conversion and transmission. Due to excessive residual stress, the connection of the substrate becomes an urgent problem to the application of the device. Aiming at AlN-Cu substrates, this study used embedded interwoven metal wires in the joint to reduce residual stress. Such stress-relaxing effect was systematically studied with mechanical tests, finite element simulations and principle of mechanics. The results showed that the distance between the metal wire and the weld edge is the key parameter for structure optimization while the number of wires has little impact. Besides, a prestress effect was identified, which can be used to determine the optimal wire placement position from stress distribution of non-wire brazing structure. This wire-embedding structure has increased the shear strength of AlN-Cu joint up to 245 MPa, which is 37.6% higher than that of non-wire structures. Providing a simple and effective solution for the residual stress control of IGBT substrates.

Key words: AlN-Cu joint, brazing, prestress effect, optimization

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