Authors: M O Jarligo D E Mack G Mauer R Vaßen D Stöver
Publish Date: 2009/08/25
Volume: 19, Issue: 1-2, Pages: 303-310
Abstract
High melting materials have always been very attractive candidates for materials development in thermal barrier coating TBC applications Among these materials complex perovskites with BaMg1/3Ta2/3O3 and LaAl1/4Mg1/2T1/4O3 compositions have been developed and deposited in TBC systems by atmospheric plasma spraying Spray parameters were optimized and inflight particle temperatures were recorded using Accurasprayg3 and DPV 2000 Plasma sprayed coatings were found to undergo nonstoichiometric decomposition of components which could have contributed to early failure of the coatings Particle temperature diagnostics suggest that gun power of ~15 kW or lower where majority of the particles have already solidified upon impact to the substrate could probably prevent the decomposition of phases Additionally it has been found that the morphology of the powder feedstock plays a critical role during atmospheric plasma spraying of complex perovskitesThis article is an invited paper selected from presentations at the 2009 International Thermal Spray Conference and has been expanded from the original presentation It is simultaneously published in Expanding Thermal Spray Performance to New Markets and Applications Proceedings of the 2009 International Thermal Spray Conference Las Vegas Nevada USA May 47 2009 Basil R Marple Margaret M Hyland YukChiu Lau ChangJiu Li Rogerio S Lima and Ghislain Montavon Ed ASM International Materials Park OH 2009The authors are grateful to Mr KH Rauwald Ms M Andreas Dr D Sebold Dr W Fischer Mrs S SchwartzLückge and Mr M Kappertz of IEF1 Forschungszentrum Jülich GmbH for their assistance in coating preparation and characterization and to Mr J Colmenares of Stony Brook University for valuable discussions on data analysis
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