Abstract
We describe the results of our experiments with directional solidification of Al 2O 3/GdAlO 3 eutectic oxide fibers using the laser heated pedestal growth technique. Fibers with sizes ranging from 500 to 640 μm diameter and 60 mm length were obtained without pores. The molten zone temperature was approximately (2100±100)°C and the axial temperature gradient in the solid–liquid interface was determined as 6×10 3 °C/cm. The microstructural relation λ 2 v=constant=(6.3±0.1) μm 3/s applied very well to Al 2O 3/GdAlO 3 eutectic fibers, despite their microstructural complexity. We were able to control the eutectic microstructure by varying the pulling rate, making possible the production of fibers free of the complex-regular fibrous pattern.
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