Interior-collapsing mechanism by hydrothermal process of the MgAl2O4/MgO porous ceramic

Abstract Ceramic core is a critical component in the super-alloy turbine blade casting. In our previous work, novel multi-phase MgAl 2 O 4 /MgO porous ceramic was prepared for this purpose. The most important property that it crumbled completely after hydrothermal treatment just pure water, due to hydration of MgO. process MgO embedded inert matrix investigated detail. collapse behaved as an interior destruction without any bulk expansion sample. percentage only factor related water-collapsibility. morphology product indicated reaction advanced particular direction. Based on finite element analysis effect structure, interior-collapsing mechanism proposed. During process, grains exerted pressure surrounding and induced adjacent structure. This took place throughout matrix. Finally, sample powders. No dilatation detected before powdering, indicating would not exert outward. Thus alloy be damaged during removal core. It also predicted decrease grain size beneficial