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Title: | Secondary Phase Interaction at Interfaces of High-Strength Brazed Joints made using Liquid Phase Sintered Alumina Ceramics and Ag-Cu-Ti Braze Alloys |
Authors: | Kassam, TA Hari Babu, N. Ludford, N Yan, S Howkins, A |
Keywords: | alumina joints;joint strength;alloys;brazing |
Issue Date: | 20-Feb-2018 |
Publisher: | Nature Publishing Group |
Citation: | Kassam, T.A., Hari Babu, N. and Howkins, A. (2018) 'Secondary Phase Interaction at Interfaces of High-Strength Brazed Joints made using Liquid Phase Sintered Alumina Ceramics and Ag-Cu-Ti Braze Alloys', Scientific Reports, 8, 3352, pp. 1 - 11. doi: 10.1038/s41598-018-20674-w. |
Abstract: | © The Author(s) 2018. Alumina-to-alumina brazed joints were formed using 96.0 and 99.7 wt.% Al_2 O_3 ceramics using 150 µm thick Ticusil® (68.8Ag-26.7Cu-4.7 wt.% Ti) braze preforms. Brazing was conducted in a vacuum of 1 x 10-5 mbar at 850 °C for 10 minutes. Joint strengths were evaluated using four-point bend testing and were compared to the monolithic flexural strengths of standard alumina test bars according to ASTM C1161-13. Brazed joints made using 96.0 wt.% Al_2 O_3 consistently outperformed brazed joints made using 99.7 wt.% Al_2 O_3, despite similarities in both the flexural strengths of the standard alumina test bars and the microstructures of brazed joints. Secondary phase interaction led to the formation of Ti_5 Si_3 reaction products at locations where the triple pocket grain boundaries of the 96.0 wt.% Al_2 O_3 surface intersected the Ti-rich reaction layers. It is proposed that due to this interaction, brazed joints made using 96.0 wt.% Al_2 O_3, which were relatively cost-effective to produce, achieved higher strengths than brazed joints made using 99.7 wt.% Al_2 O_3. |
URI: | https://bura.brunel.ac.uk/handle/2438/15726 |
DOI: | https://doi.org/10.1038/s41598-018-20674-w |
Other Identifiers: | 3352 |
Appears in Collections: | The Experimental Techniques Centre Brunel Centre for Advanced Solidification Technology (BCAST) |
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