Evaluation of Normal and Nanolayer Composite Thermal Barrier Coatings in Fused Vanadate-Sulfate Salts at 1000°C

Mohammadreza Daroonparvar; Muhamad Azizi Mat Yajid; Noordin Mohd. Yusof; Hamid Reza Bakhsheshi-Rad; Mohammad Sakhawat Hussain; Esah Hamzah

doi:10.1155/2013/790318

Advances in Materials Science and Engineering (Jan 2013)

Evaluation of Normal and Nanolayer Composite Thermal Barrier Coatings in Fused Vanadate-Sulfate Salts at 1000°C

Mohammadreza Daroonparvar,
Muhamad Azizi Mat Yajid,
Noordin Mohd. Yusof,
Hamid Reza Bakhsheshi-Rad,
Mohammad Sakhawat Hussain,
Esah Hamzah

Affiliations

Mohammadreza Daroonparvar: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Muhamad Azizi Mat Yajid: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Noordin Mohd. Yusof: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Hamid Reza Bakhsheshi-Rad: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Mohammad Sakhawat Hussain: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia
Esah Hamzah: Department of Materials, Manufacturing and Industrial Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor, Malaysia

DOI: https://doi.org/10.1155/2013/790318
Journal volume & issue: Vol. 2013

Abstract

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Hot corrosion behavior of yttria stabilized zirconia (YSZ), YSZ/normal Al2O3, and YSZ/nano-Al2O3 coatings was investigated in the presence of molten mixture of Na2SO4 + V2O5 at 1000°C. Microstructural characterization showed that the creation of hot corrosion products containing YVO4 crystals and monoclinic ZrO2 is primarily related to the reaction between NaVO3 and Y2O3 during hot corrosion. The lowest amount of hot corrosion products was observed in YSZ as an inner layer of YSZ/nano-Al2O3 coating. Hence, it can be concluded that the presence of nanostructured Al2O3 layer over the conventional YSZ coating can considerably reduce the infiltration of molten corrosive salts into the YSZ layer during hot corrosion which is mainly related to the compactness of nanostructured alumina layer (including nanoregions) in comparison with normal alumina layer.

Published in Advances in Materials Science and Engineering

ISSN: 1687-8434 (Print); 1687-8442 (Online)
Publisher: Wiley
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://onlinelibrary.wiley.com/journal/5928

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