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- Title
Calcia-doped yttria-stabilized zirconia for thermal barrier coatings: synthesis and characterization.
- Authors
Bhattacharya, Anup k.; Reinhard, Patrick; Steurer, Walter; Shklover, Valery
- Abstract
Doping with other oxides has been a stabilization method of ZrO for thermal barrier coating applications. Such a stabilized system is 7-8 mol% YO-doped zirconia (7YSZ), which has been in use for around 20 years. In this study, calcia (CaO) and yttria (YO) have been used for doping ZrO to produce a stable single-phase cubic calcia-doped yttria-stabilized zirconia (CaYSZ). This has been synthesized using wet chemical synthesis as well as by solid-state synthesis. Unlike partially stabilized zirconia where 5 mol% CaO is doped into ZrO, CaYSZ has been found to be stable up to 1600 °C. Detailed CaYSZ synthesis steps and phase characterization are presented. Wet chemical synthesis resulted in a stable single-phase CaYSZ just after 4 h treatment at 1400 °C, whereas a 36 h annealing at 1600 °C is required for CaYSZ synthesis during solid-state processing. The CaYSZ has been found stable even for 600 h at 1250 °C. Coefficient of thermal expansion and sintering temperature of CaYSZ was found to be 11 × 10 K and 1220 °C, respectively, which are comparable to 7YSZ. An increase in sintering rate with increasing dopant concentration has also been observed.
- Subjects
OXIDES; THERMAL barrier coatings; ZIRCONIUM oxide; LIME (Minerals); THERMAL expansion
- Publication
Journal of Materials Science, 2011, Vol 46, Issue 17, p5709
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-011-5524-6