Joining of SiO2f/SiO2 composite to Ti-6Al-4V using Ag-Cu-In-Ti brazing fillers, the joint strengths, and microstructures
Joining of SiO2f/SiO2 composite to Ti-6Al-4V using Ag-Cu-In-Ti brazing fillers, the joint strengths, and microstructures
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DOI：
10.1007/s40194-017-0450-0
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发表时间：
2017-03
影响因子：
2.1
通讯作者：
Chen Bo;Zou Wen-Jiang;Liao Wen-wen;Wu Shi-biao;Xi Hua-Ping
中科院分区：
文献类型：
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作者：
Chen Bo;Zou Wen-Jiang;Liao Wen-wen;Wu Shi-biao;Xi Hua-Ping
设计了3种新型Ag-Cu-In-Ti钎料，用于SiO 2f/SiO2复合材料与Ti-6Al-4V的钎焊连接。采用座滴法研究了3种钎料在1073 K、30 min条件下对复合材料的润湿性。结果表明，三种钎料的接触角分别为27°、33°和35°。Ag-（22~26）Cu-（8~12）In-（4.5~6.0）Ti在1073 K保温10 min钎焊接头的平均剪切强度最高，为19.6 MPa，而Ag-（22~26）Cu-（8~12）In-（3.2~3.8）Ti钎焊接头的平均剪切强度仅为10.5 MPa。钎焊过程中，活性元素Ti从Ag-Cu-In-Ti合金中向SiO 2f/SiO2复合材料表面扩散，在SiO 2f/SiO2复合材料附近形成了一层薄的反应层。在Ti-6Al-4V侧也实现了良好的界面结合。通过X射线衍射分析，在SiO 2f/SiO2/Ag-（22~26）Cu-（8~12）In-（4.5~6.0）Ti/Ti-6Al-4V复合材料的断口上发现了Ag、Ni 3 Ti 3 O、Cu 4 Ti 3、Cu 3 Ti和TiSi 2相。Ag-（22~26）Cu-（8~12）In-（4.5~6.0）Ti合金钎焊接头的界面结构为：SiO 2f/SiO2→ Cu-Ti-O + Ti-Si相→ Ag基固溶体+ Cu-Ti + Ti-In相→ Ti-6Al-4V。
Three novel Ag-Cu-In-Ti brazing fillers were designed for joining of SiO2f/SiO2composite to Ti-6Al-4V. The wettability of the three brazing fillers on the composite was studied with the sessile drop method at 1073 K for 30 min. The results showed that the three brazing fillers exhibited contact angles of 27°, 33°, and 35°, respectively. The joints brazed with Ag-(22~26)Cu-(8~12)In-(4.5~6.0)Ti at 1073 K for 10 min presented the maximum average shear strength of 19.6 MPa, whereas the strength of the joints brazed with Ag-(22~26)Cu-(8~12)In-(3.2~3.8)Ti was only 10.5 MPa. During the brazing process, the active element Ti diffused significantly from the Ag-Cu-In-Ti alloy to the surface of the SiO2f/SiO2composite and a thin reaction layer was formed close to SiO2f/SiO2composite. Sound interfacial bonding was also achieved at the Ti-6Al-4V side. According to micro-analysis results, Ag, Ni3Ti3O, Cu4Ti3, Cu3Ti, and TiSi2phases were identified at the fracture surface of SiO2f/SiO2/Ag-(22~26)Cu-(8~12)In-(4.5~6.0)Ti/Ti-6Al-4V by the XRD method. The interface structure of the joint brazed with Ag-(22~26)Cu-(8~12)In-(4.5~6.0)Ti alloy can be described as the following sequence: SiO2f/SiO2→ Cu-Ti-O + Ti-Si phases → Ag-based solid solution + Cu-Ti + Ti-In phases → Ti-6Al-4V.