October: Dr Pramod Koshy and Prof. Chris Sorrell, "Interfacial Reactions between BaAl2Si2O8 and Molten Al Alloy at 850°C"
High-temperature interfacial reactions between barium aluminosilicates and Al Alloys
Corrosion of refractory ceramics in aluminium casting furnaces is a major issue that affects efficiencies and productivities. Addition of Ba-compounds to refractories has shown promise in improving the corrosion resistance and this is attributed to the formation of barium aluminosilicates (BaAl2Si3O8 – celsian/hexacelsian) at the interface. The present work investigated the high temperature reactions between BaAl2Si3O8 and aluminium alloy 7075 over extended periods of time in order to understand the interfacial phenomena controlling the corrosion resistance. The work was able to show that the positive effect of BaAl2Si3O8 addition is linked to the formation of barium hexaaluminate through an interdiffusion reaction between alloy and refractory constituents.
Click here to view the full journal article, as published in The Journal of American Ceramics Society, Volume 98, Issue 10, 1 October 2015.