Microstructure and mechanical properties of 17-4 PH stainless steel and Al2O30 ceramic joints brazed with graphene reinforced Ag-Cu-Ti brazing alloy

被引：18
作者：
Yang, Z. W. [1 ,2 ]
Yang, J. H. [1 ]
Han, Y. J. [3 ]
Wang, Y. [1 ,2 ]
Wang, D. P. [1 ,3 ]
机构：
[1] Tianjin Univ, Sch Mat Sci & Engn, Tianjin Key Lab Adv Joining Technol, Tianjin 300350, Peoples R China
[2] Minist Educ, Key Lab Adv Ceram & Machining Technol, Tianjin 300350, Peoples R China
[3] Tianjin Univ, Natl Expt Teaching Demonstrat Ctr Mat Sci & Engn, Tianjin 300350, Peoples R China
来源：
VACUUM | 2020年 / 181卷
基金：
中国国家自然科学基金;
关键词：
Microstructure; Al2O3; ceramic; Brazing; Graphene; Mechanical properties; INTERFACIAL MICROSTRUCTURE; COMPOSITE; FILLER; EVOLUTION; BEHAVIOR; TEMPERATURE; TI-6AL-4V; STRENGTH; ALUMINA; STRESS;
D O I：
10.1016/j.vacuum.2020.109604
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
17-4 PH stainless steel and Al2O3 ceramic were successfully vacuum brazed using graphene reinforced Ag-Cu-Ti brazing alloy. In this paper, the effects of operating parameter such as brazing temperature, holding time and graphene amount on the microstructure and mechanical properties of the brazed joints were systematically studied. The experiment revealed that with the elevation of brazing temperature and holding time, the shear strength of 17-4 PH stainless steel and Al2O3 ceramic joints brazed with Ag-Cu-Ti filler alloy increased first, getting the maximum 170 MPa at 880 C for 10 min and then declined. When the joint brazed with 0.1 wt % graphene reinforced Ag-Cu-Ti composite filler, the maximum shear strength reached 212 MPa that was 25% higher than the joint with single Ag-Cu-Ti filler metal. Moreover, fracture path of the 17-4 PH stainless steel and Al2O3 ceramic joint with 0.1 wt % graphene reinforced Ag-Cu-Ti was changed from the ceramic to the reaction layer that was closed to Al2O3 substrate. The improvement of the joint shear strength was chiefly benefited from the formation of TiC particle that reinforced brazing seam and the refinement of joint microstructure.
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页数：11
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