J. Mater. Sci. Technol. ›› 2020, Vol. 50: 13-20.DOI: 10.1016/j.jmst.2019.08.002
• Research Article • Previous Articles Next Articles
Bo Chen, Wen-Jiang Zou, Wen-Wen Li, Shi-Biao Wu, Hua-Ping Xiong*(), Xin Wu
Received:
2018-10-23
Revised:
2019-04-29
Accepted:
2019-06-03
Published:
2020-08-01
Online:
2020-08-10
Contact:
Hua-Ping Xiong
Bo Chen, Wen-Jiang Zou, Wen-Wen Li, Shi-Biao Wu, Hua-Ping Xiong, Xin Wu. Joining of SiO2f/SiO2 composite to Nb using Ag-Cu-In-Ti brazing alloys[J]. J. Mater. Sci. Technol., 2020, 50: 13-20.
Alloy code | Composition (wt%) | TS (K) | TL (K) | |||
---|---|---|---|---|---|---|
Ag | Cu | In | Ti | |||
1# | 61.2 | 23.8 | 10 | 5 | 921.8 | 1011.9 |
2# | 57.6 | 22.4 | 15 | 5 | 913.5 | 1014.0 |
3# | 61.9 | 24.1 | 10 | 4 | 932.7 | 1012.4 |
Table 1 Composition and melting temperature of the three Ag-Cu-In-Ti alloys.
Alloy code | Composition (wt%) | TS (K) | TL (K) | |||
---|---|---|---|---|---|---|
Ag | Cu | In | Ti | |||
1# | 61.2 | 23.8 | 10 | 5 | 921.8 | 1011.9 |
2# | 57.6 | 22.4 | 15 | 5 | 913.5 | 1014.0 |
3# | 61.9 | 24.1 | 10 | 4 | 932.7 | 1012.4 |
Fig. 4. Wetting morphologies of three brazing alloy samples on SiO2f/SiO2 composite (heating condition: 1073 K /30 min): (a) 1# alloy; (b) 2# alloy; (c) 3# alloy.
Fig. 5. Wetting kinetics of 1# alloy on SiO2f/SiO2 composite: (a) change of contact angle with temperature; (b) change of contact angle with holding time at 1073 K.
Fig. 6. Morphologies of 1# molten droplet on SiO2f/SiO2 composite at different heating stages: (a) heated to 1053 K; (b) heated to 1073 K; (c) at 1073 K for 10 min; (d) at 1073 K for 30 min.
Micro-zone | Composition (at%) | Possible phase | |||||||
---|---|---|---|---|---|---|---|---|---|
Ag | Cu | Ti | In | Nb | Si | O | Au | ||
1 | 0.60 | 27.03 | 39.73 | 0.10 | 0.07 | 7.37 | 24.54 | 0.56 | Cu-Ti-O and SiO2 |
2 | 0.33 | 4.26 | 28.13 | 0.03 | 0.05 | 16.52 | 50.37 | 0.31 | Ti-O, Ti-Si and SiO2 |
3 | 81.81 | 7.34 | 0.06 | 3.54 | 0.05 | 0.09 | 6.52 | 0.59 | Ag(s, s) |
4 | 1.05 | 74.03 | 21.27 | - | - | 0.02 | 2.68 | 0.95 | Cu-Ti compound |
5 | 1.17 | 51.77 | 40.81 | - | 0.98 | 0.02 | 4.44 | 0.81 | Cu-Ti compound |
Table 2 EDS analyzed results of micro-zones marked in Fig. 7(a).
Micro-zone | Composition (at%) | Possible phase | |||||||
---|---|---|---|---|---|---|---|---|---|
Ag | Cu | Ti | In | Nb | Si | O | Au | ||
1 | 0.60 | 27.03 | 39.73 | 0.10 | 0.07 | 7.37 | 24.54 | 0.56 | Cu-Ti-O and SiO2 |
2 | 0.33 | 4.26 | 28.13 | 0.03 | 0.05 | 16.52 | 50.37 | 0.31 | Ti-O, Ti-Si and SiO2 |
3 | 81.81 | 7.34 | 0.06 | 3.54 | 0.05 | 0.09 | 6.52 | 0.59 | Ag(s, s) |
4 | 1.05 | 74.03 | 21.27 | - | - | 0.02 | 2.68 | 0.95 | Cu-Ti compound |
5 | 1.17 | 51.77 | 40.81 | - | 0.98 | 0.02 | 4.44 | 0.81 | Cu-Ti compound |
Fig. 10. Microstructures of SiO2f/SiO2-Nb joint brazed with three Ag-Cu-In-Ti alloys at brazing temperature of 1073 K: (a) 1# alloy, 30 min; (b) 1# alloy, 60 min; (c) 2# alloy, 30 min; (d) 2# alloy, 60 min; (e) 3# alloy, 30 min; (f) 3# alloy, 60 min.
Fig. 13. Fracture morphologies of SiO2f/SiO2 -Nb joints brazed with 1# filler at brazing temperature of 1073 K for 10 min: (a) fracture photo; (b) fracture diagrammatic sketch.
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