Abstract
Abstract In the current work, yttria stabilized zirconia splats and coatings were deposited onto superalloy substrates at different temperatures using axial suspension plasma spraying (ASPS). The splats were characterized by scanning and transmission electron microscopy. As the substrates were heated from room temperature to 300 °C, splat morphology changed rapidly. Examination of the morphological and crystallographic features of splats revealed that cooling rate during impacting and spreading might be lower than that of splats deposited by conventional atmospheric plasma spraying. Based on these observations, a possible mechanism is proposed to explain the cauliflower microstructure.
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