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Lifetime determining factors during thermal cycling of zirconia based thermal barrier coatings
1995 (English)In: Surface Engineering, ISSN 0267-0844, E-ISSN 1743-2944, Vol. 11, no 3, 233-239 p.Article in journal (Refereed) Published
Abstract [en]

Plasma sprayed yttria stabilised zirconia (YSZ) coatings were investigated to assess the factors influencing their durability during thermal cycling. For any given powder, the best performance was found to be achieved at an optimum plasma arc current, all other spray parameters being held constant. The YSZ overlayer thickness was found to be an important lifetime determining factor. Use of a NiCoCrAlY bond coat instead of Ni–Cr led to a substantial improvement in coating lifetime, with the enhancement provided by NiCoCr AlY becoming more pronounced with increasing porosity level of the ceramic overlayer. A post-coating heat treatment was also found to be beneficial to coating longevity. The relative ranking of magnesium zirconate and YSZ coatings was found to depend upon the thermal cycle adopted during testing, which has important implications in designing accelerated tests to evaluate coating performance.

Place, publisher, year, edition, pages
1995. Vol. 11, no 3, 233-239 p.
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-8558DOI: 10.1179/sur.1995.11.3.233OAI: oai:DiVA.org:hv-8558DiVA: diva2:861163
Available from: 2015-10-15 Created: 2015-10-15 Last updated: 2016-02-11Bibliographically approved

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Joshi, Shrikant V.
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