Tuning the sapphire EFG process to the growth of Al 2 O 3 /YAG/ZrO 2 :Y eutectic

Growth rate effect on colony formation in directional solidification of Al2O3/YAG/ZrO2

“…Edge‐defined Film‐fed Growth technique was used to grow Al 2 O 3 /YAG/ZrO 2 ribbons of 3 cm in width and 0.3 cm in thickness (see Figure ). Numerical modeling is applied to compute the shape of the solid‐liquid interface as function of the growth rate.…”

“…Flow computations including buoyancy and Marangoni convection are performed only in the local model. The meniscus height () was estimated by applying the analytical model described in a previous work …”

“…Eutectic ceramic ribbons of 0.3 mm thickness and 3 cm wide were grown by the Edge‐defined Film‐fed Growth method . In this technique, the molten charge contained in a crucible rises through a capillary channel and forms a meniscus at the top of a shaper (die).…”

“…Eutectic ceramic oxides grown by directional solidification are of interest for structural applications at high temperatures. Promising materials in this respect are Al 2 O 3 /Y 3 Al 5 O 12 (Al 2 O 3 /YAG), Al 2 O 3 /Er 3 Al 5 O 12 , Al 2 O 3 /GdAlO 3 and Al 2 O 3 /YAG/ZrO 2 . For example, the ternary eutectic composite Al 2 O 3 /YAG/ZrO 2 displays excellent mechanical properties at high temperatures .…”

“…According to Lakiza, two parameters show a significant impact on defect formation in directionally solidified eutectic ceramics: the growth rate and the temperature gradient at the solidification front. Various crystallization methods are used to investigate these composites: Bridgman, laser‐heated floating zone, micro‐pulling down, Edge‐defined Film‐fed Growth (EFG), and Czochralski method (Cz) …”