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Title: | The effect of post-grinding heat treatment of alumina and Ag-Cu-Ti braze preform thickness on the microstructure and mechanical properties of alumina-to-alumina brazed joints |
Authors: | Kassam, TA Nadendla, HB Ludford, N Buisman, I |
Keywords: | advanced ceramics;alumina;brazing;heat treatment;joining;joint strength;preform thickness;TICUSIL |
Issue Date: | 24-May-2016 |
Publisher: | Springer Verlag (Germany) |
Citation: | Kassam, T.A., Nadendla, H., Ludford, N. and Buisman, I. (2016) 'The effect of post-grinding heat treatment of alumina and Ag-Cu-Ti braze preform thickness on the microstructure and mechanical properties of alumina-to-alumina brazed joints', Journal of Materials Engineering and Performance, 25(8), pp. 3218 - 3230. doi: 10.1007/s11665-016-2070-z. |
Abstract: | Copyright © The Author(s). Alumina-to-alumina-brazed joints were formed using 96.0 and 99.7 wt.% Al2O3 and TICUSIL (68.8Ag-26.7Cu-4.5Ti wt.%) preforms of different thicknesses. Brazing was conducted in a vacuum of 131025 mbar at 850 C for 10 minutes. Joint strengths were evaluated using four-point bend testing and were compared to flexural strengths of standard test bars. Post-grinding heat treatment, performed at 1550 C for 1 hour, did not affect the average surface roughness or grain size of either grades of alumina but affected their average flexural strengths with a small increase for 96.0 wt.% Al2O3 and a small decrease for 99.7 wt.% Al2O3. As the TICUSIL preform thickness was increased from 50 to 100 lm, the average strengths of both 96.0 and 99.7 wt.% Al2O3 brazed joints improved. Joints made using 100-lm-thick TICUSIL preforms predominantly consisted of Cu-Ti phases which formed due to excess Ti in the interlayers and non-uniform Ag-rich outflow. Brazed joints of 96.0 wt.% Al2O3 made using 100-lm-thick TICUSIL preforms achieved an average joint strength of 238 MPa with consistent failure in the ceramic. |
URI: | https://bura.brunel.ac.uk/handle/2438/12680 |
DOI: | https://doi.org/10.1007/s11665-016-2070-z |
ISSN: | 1059-9495 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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