Properties of the joint of Si C ceramics brazed by Ag-Cu-Ti+W composite filler

ZHANG Chao; HOU Guixian; ZHONG Zhihong; WANG Zhi-quan

doi:10.7512/j.issn.1001-2303.2021.05.18

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Properties of the joint of Si C ceramics brazed by Ag-Cu-Ti+W composite filler
Vol. 51, Issue 5, Pages: 97-102(2021)
Published：2021
DOI： 10.7512/j.issn.1001-2303.2021.05.18
稿件说明：

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DOI：

ZHANG Chao, HOU Guixian, ZHONG Zhihong, et al. Properties of the joint of Si C ceramics brazed by Ag-Cu-Ti+W composite filler[J]. Eletric Welding Machine2021, 51(5): 97-102. DOI： 10.7512/j.issn.1001-2303.2021.05.18.

摘要

通过使用Ag-Cu-Ti钎料钎焊

可以实现Si C陶瓷的有效连接

但它与陶瓷母材热膨胀系数相差较大

钎焊降温过程中会产生较大的残余应力。通过向Ag-26.7Cu-4.5Ti钎料中复合不同体积分数的W颗粒

调节钎料的热膨胀系数

使之更接近于母材。通过改变钎焊温度和保温时间

研究工艺参数对焊缝的显微组织和力学性能的影响。结果表明

W颗粒均匀分布在基体中且未与其他元素反应。当添加合适的体积分数的W颗粒

并且在适当的钎焊温度和保温时间下

能够形成组织均匀、连接良好的复合接头。当添加的W的体积分数为10%

在钎焊温度为807 ℃、保温时间为10 min的条件下

可获得高剪切强度为95.05 MPa。

Abstract

The effective connection of Si C ceramics can be achieved through the brazing with Ag-Cu-Ti filler. A large residual stress is caused in the cooling process of brazing due to a big difference of thermal expansion coefficient between the filler and Si C ceramic. In this article

the thermal expansion coefficient of Ag-26.7 Cu-4.5 Ti filler is adjusted by adding W particles with different volume fraction to make it closer to Si C ceramics. The influence of brazing parameters on microstructure and mechanical properties of weld is studied by changing brazing temperature and holding time. The results show that W particles are uniformly distributed in the matrix and do not react with other elements. When adding a suitable volume fraction of W particles

a composite joint with uniform microstructure and good connection is formed under an appropriate brazing temperature and holding time. When the adding volume fraction of W is 10%

the maximum shear strength of 95.05 MPa is obtained at 807 ℃ for 10 min.