ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA
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Metal oxide ingots with fine grain size can be fabricated by growth from the melt. An oriented lamellar-type microstructure free of cracks is developed in the Al2O3ZrO2 eutectic system by controlled solidification with the gradient furnace. The colonies inherent in ingots grown by a modified Bridgman technique have been eliminated and also a lamellar-type rather than a rod-type microstructure is produced in ingots grown with the gradient furnace. Cracking does not occur at the eutectic grain boundaries as it does for polycrystalline aggregates of Al2O3, MgAl2O4, or Y3Al5O12 solidified from the melt.
- Ceramics, Refractories and Glass