Joining and testing of alumina fibre reinforced YAG-ZrO2 matrix composites |
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| Authors: | Muhammad Yasir Akram Monica Ferraris Valentina Casalegno Milena Salvo Georg Puchas Stefan Knohl Walter Krenkel |
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| Affiliation: | 1. Department of Applied Science and Technology, Politecnico di Torino, Italy;2. Department of Ceramic Materials Engineering, University of Bayreuth, Bayreuth, Germany |
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| Abstract: | Alumina (Nextel? 610) fibre reinforced YAG-ZrO2 matrix composites were successfully joined by using different brazing alloys, metallic interlayers and a glass-ceramic. All joints were mechanically stable and free of cracks. Three commercial brazing alloys and a new alloy based on Ti/Cu/Al interlayers were selected to join these composites for applications in a non-oxidizing environment. A glass-ceramic based on SiO2-Al2O3-CaO-MgO was developed in case the joined component needs to be oxidation resistant. To evaluate the thermal stability, all joined composites were aged up to 100 h in air at 550 °C for brazing joints or 850 °C and 930 °C for glass-ceramic joints. The mechanical strength was measured using single lap and four point bending tests before and after ageing. Four point bending tests on glass-ceramic joined samples showed an average joint strength of about 70 MPa which is 35% of as-received composites. |
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| Keywords: | Oxide/oxide composites Joining Alumina fibres Glass-ceramics |
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