期刊
CERAMICS INTERNATIONAL
卷 36, 期 3, 页码 961-968出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2009.10.020
关键词
Thermal properties; ZrO(2); Thermal applications; Plasma spraying
Thick plasma sprayed thermal barrier coatings are suitable for thermal and hot corrosion protection of metal components in land-based turbine and diesel engines. In this work, ceria yttria co-stabilized zirconia coatings were deposited by atmospheric plasma spraying in a mixture of non-transformable tetragonal t' and cubic c zirconia phases. Free-standing coatings were isothermally annealed at 1315 degrees C for different times and their crystal structure was studied by XRD. No phase decomposition occurred. Columnar grains grew in the molten splats with increasing annealing time according to a preferential direction and, after 50 h of heat treatment, they were partially replaced by equiaxed grains. Both in-plane and out-of-plane thermal expansion coefficients (CTEs) were measured from coating expansion during heating. The CTE was slightly sensitive to thermal exposure in out-of-plane direction, whereas it kept almost constant in plane direction. The specific heat capacity Cp of annealed coatings, measured by differential scanning calorimetry (DSC), decreased in comparison with as-sprayed coating, due to high-temperature sintering. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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