Role of Magnesia Stabilized Zirconia Dispersion on the Hot Corrosion Behaviour of NiCrAlY Plasma-Sprayed Coatings in Na2SO4 + 50 wt% V2O5 and Na2SO4 + 10 wt% NaCl Melts at 800 °C

In order to understand the possible role of magnesia stabilised zirconia (MSZ) on hot corrosion in graded thermal barrier coatings, plain and 25 and 50 wt% MSZ dispersed NiCrAlY coatings, developed using air plasma spray technique was examined by exposing them to Na 2 SO 4  + 50 wt% V 2 O 5 and Na 2...

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Bibliographic Details
Published in:Transactions of the Indian Institute of Metals 2016-05, Vol.69 (4), p.869-879
Main Authors: Sreedhar, Gosipathala, Raja, V. S.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Corrosion and Coatings
Materials Science
Metallic Materials
Technical Paper
Tribology
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Summary:In order to understand the possible role of magnesia stabilised zirconia (MSZ) on hot corrosion in graded thermal barrier coatings, plain and 25 and 50 wt% MSZ dispersed NiCrAlY coatings, developed using air plasma spray technique was examined by exposing them to Na 2 SO 4  + 50 wt% V 2 O 5 and Na 2 SO 4  + 10 wt% NaCl environments at 800 °C. The study shows that MSZ dispersion significantly increases the hot corrosion tendency of NiCrAlY coatings in both the environments and that the MSZ phase suffers destabilization into monoclinic ZrO 2 in both the environments suggesting that it cannot be used for producing graded bond coats. Mg ions leach out from MSZ phase forming Mg 3 V 2 O 8 and MgCl 2 on exposure to vanadates and chlorides respectively. The study further demonstrates that chloride is more detrimental to the coatings than vanadate.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-015-0569-x