Joining of SiO_2f/SiO₂ composite to Al₂O₃ ceramic using AgCu-Ti brazing filler metal

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• 作者：Shi-Biao Wu ; Hua-Ping Xiong ; Bo Chen ; Yao-Yong Cheng
• 关键词：(IIW Thesaurus)Brazing ; Dissimilar materials ; Ceramics ; Composite materials ; Microstructure ; Shear strength ; Process parameters
• 刊名：Welding in the World
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：61
• 期：1
• 页码：181-186
• 全文大小：
• 刊物主题：Metallic Materials; Continuum Mechanics and Mechanics of Materials; Theoretical and Applied Mechanics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1878-6669
• 卷排序：61

文摘

SiO_2f/SiO₂ composite was joined to Al₂O₃ ceramic using AgCu-Ti active filler at brazing temperature of 1153 K for 10 and 60 min, respectively, and sound joints were achieved. It was found that a thin reaction layer had been formed close to each of the joined materials, and the brazing seam matrix was composed of homogeneous Ag-Cu eutectic alloy. The joint interface was analyzed by SEM, EDS, and XRD. The typical interface structure of joint brazed at 1153 K for 10 min could be described as the following sequence: SiO_2f/SiO₂ → TiO₂ + Ti₅Si₄ → TiO₂ + Cu₃Ti₃O → Ag-Cu eutectic alloy → (Ti-O) + (Ti-Cu-O) → Al₂O₃. However, Cu₂Ti₄O but not Cu₃Ti₃O was detected in the joints brazed at 1153 K for 60 min. Besides, the reaction layers of joint brazed at 1153 K for 60 min were much thicker than those for 10 min. The SiO_2f/SiO₂-Al₂O₃ joints brazed at 1153 K for 10 min showed an average shear strength of 38.6 MPa, evidently higher than that (26.0MPa) brazed at 1153 K for 60 min.