Joining of SiO2f/SiO2 composite to Nb using Ag-Cu-In-Ti brazing alloys
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第15期
论文作者：Bo Chen Wen-Jiang Zou Wen-Wen Li Shi-Biao Wu Hua-Ping Xiong Xin Wu
文章页码：13 - 20
摘 要：Three compositions of Ag-Cu-In-Ti system brazing alloys were designed for joining SiO2 f/SiO2 ceramic composite to Nb metal.The wettability of the three alloys on the composite was studied with the sessile drop method.The results showed that after heating at 1073 K for 30 min,they exhibited contact angles of 74°,83° and 86°,respectively.The brazing alloys were fabricated into foils by rapid solidification technique.Among the three brazing filler alloys the joints brazed with AgCu-10 In-5 Ti at 1073 K for 10 min presented the maximum average shear strength of 30.9 MPa.During the brazing process the active element Ti diffused strongly from the filler alloy to the composite surface and a reaction layer with a thickness of 2-3 μm was formed.Sound metallurgical bonding was also achieved at the Nb side.The interface structure of the joint brazed with the AgCu-10 In-5 Ti alloy can be described as the following sequence:SiO2 f/SiO2→SiO2+Cu3 Ti3 O→SiO2+TiO+Ti5 Si4→Ag（s,s）+（Cu-Ti）→Nb.However,for the filler alloy with 4.0 wt% Ti content the joint strength was only 15.8 MPa.
Bo Chen，Wen-Jiang Zou，Wen-Wen Li，Shi-Biao Wu，Hua-Ping Xiong，Xin Wu
Welding and Plastic Forming Division, Beijing Institute of Aeronautical Materials
摘 要：Three compositions of Ag-Cu-In-Ti system brazing alloys were designed for joining SiO2 f/SiO2 ceramic composite to Nb metal.The wettability of the three alloys on the composite was studied with the sessile drop method.The results showed that after heating at 1073 K for 30 min,they exhibited contact angles of 74°,83° and 86°,respectively.The brazing alloys were fabricated into foils by rapid solidification technique.Among the three brazing filler alloys the joints brazed with AgCu-10 In-5 Ti at 1073 K for 10 min presented the maximum average shear strength of 30.9 MPa.During the brazing process the active element Ti diffused strongly from the filler alloy to the composite surface and a reaction layer with a thickness of 2-3 μm was formed.Sound metallurgical bonding was also achieved at the Nb side.The interface structure of the joint brazed with the AgCu-10 In-5 Ti alloy can be described as the following sequence:SiO2 f/SiO2→SiO2+Cu3 Ti3 O→SiO2+TiO+Ti5 Si4→Ag（s,s）+（Cu-Ti）→Nb.However,for the filler alloy with 4.0 wt% Ti content the joint strength was only 15.8 MPa.
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