Wettability of transparent YAG (Y3Al5O12) by molten Ag–Cu–Ti alloys. Issue 10 (September 2015)

• Record Type: Journal Article
• Authors: Gambaro, S.; Muolo, M.L.; Valenza, F.; Cacciamani, G.; Esposito, L.; Passerone, A.
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 10(2015:Oct.)
• Page Start: 2895
• Page End: 2906
• Publication Date: 2015-09
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.03.036
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">The wetting of transparent YAG (Y₃Al₅O₁₂) by alloys of the AgCuTi system has been studied for the first time. The role of the activity of Ti in determining the interactions between the brazing alloys and the YAG substrate has been analyzed by CALPHAD method. The low contact angle values ensure very good (at 950 °C) and fair (at 850 °C and 820 °C) wettability conditions. A significant reactivity occurred at the solid–liquid interfaces, with the formation of new phases. TiY₂O₅ was found at Ag–Ti/YAG interfaces, while a second layer, identified as "M₄X", associated to the significant wettability improvement, was specifically found only in the AgCuTi/YAG samples tested at 950 °C. All these phases were identified by the newly calculated Ag–Cu–Ti phase diagram and were confirmed by SEM and EDS analyses. The obtained good wettability and the maintained transparency of the YAG are promising for the production of brazed optical windows to be used under extreme conditions.</p> </sec> </abstract>