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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 55  1996
Formation of Yttria (10 mol o/o) Doped Zirconia Coating on Zircaloy Substrate by Sol-Gel Technique and its Characterisation
S. RAMANATHAN, S. K. Rov, R. BHAT AND D. D. UPADHYAYA
Pages : 119-123
DOI : 10.1080/0371750X.1996.10804768
Abstract
Formation of zirconia-tO mol% yttria coating on zircaloy by the dip coating technique using sol-gel method was studied. A hydrosol of zirconia was prepared by the thermal hydrolysis of aqueous zirconium oxychloride followed by coagulation-peptisation in water. The zircaloy substrate was cleaned using S%HF-45%HN03-SO%H20 solution and coated with the zirconia sol containing required amount of ·yttrium nitrate. Characterisation by XRD and IR spectra studies of the dried gel and that heated to 250°C showed the presence of capillary water and monoclinic phase. Heating to 600°C results in formation of solid solution of cubic zirconia-yttria. Morphological characterisation by· SEM showed that crack free, fine grained and smooth films of thickness about one micron can be prepared by repeated coating with a sol of 0.1 M zirconia (1.2 wt%) and a rate of withdrawal of 0.5 em per minute.
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