| Alumina joining using magnesium- or calcium-aluminosilicate glass-ceramic filler comprising Si3N4 |
| Muhammad Salman1, Sung-Soo Ryu2, Dang-Hyok Yoon1 |
1School of Materials Science and Engineering, Yeungnam University, Gyeongsan 38541, South Korea
2Engineering Ceramic Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, South Korea |
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Received: August 28, 2022; Revised: January 4, 2023 Accepted: January 7, 2023. Published online: January 26, 2023. |
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| ABSTRACT |
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Magnesium- and calcium-aluminosilicate (MAS and CAS, respectively) glass-ceramics containing different amounts of Si3N4 (0, 20, 40, and 60 wt.%) were examined as fillers for alumina joining. After applying filler paste onto the alumina base plate via screen-printing, joining was performed at 1500 °C for 1 h at 12 MPa pressure in a N2 atmosphere. The phase and microstructural evolution in the joint interlayer and the resulting joint strength were analyzed as a function of the Si3N4 content. Both MAS and CAS fillers with up to 40 wt.% Si3N4 wetted the alumina surface after melting, while those with 60 wt.% Si3N4 exhibited incomplete melting. The variation in joint strength was explained by the evolution of phases at the interface and the thermal expansion coefficient mismatch between the filler and alumina base plate. The highest joint strength of 317 ± 39 MPa was obtained for the MAS filler with 40 wt.% Si3N4. |
| Key words:
Joining · Alumina · Glass-ceramic · SiAlON · Joint strength |
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