Thermal barrier coatings from sol-gel-derived spray-grade Y203-Zr02 microspheres
M. CHATTERJEE, J. RAY, A. CHATTERJEE, D. GANGULI
JOURNAL OF MATERIALS SCIENCE
abstract:For the development of ceramic thermal barrier coatings, spray-grade yttria-stabilized zirconia microspheres were prepared by the sol-gel technique. Oxide microspheres were obtained by calcination of the corresponding gel spheres at 1000 ~ Scanning electron microscopic and optical microscopic observations revealed the material thus obtained to have a predominantly spherical morphology and the requisite size distribution (5-50 gm). The dense, calcined microspheres showed good flowability. X-ray diffraction studies indicated the presence of the tetragonal polymorph of Zr02 as the major phase, in addition to about 14% monoclinic Zr02. The plasma-sprayed YSZ coatings made from the sol-gel-derived microspheres showed a further decrease in the monoclinic Zr02 content (6%). The coatings survived 40 50 thermal cycles (30 min at 1200~ followed by a water quench), indicating good thermal shock resistance.
keywords:Plasma spray;
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