Effect of molten V₂O₅ salt on the corrosion behavior of micro- and nano-structured thermal sprayed SYSZ and YSZ coatings

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• 作者：M.R. Loghman-Estarki ^{loghman57@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; R. Shoja Razavi ; ^{shoja_r@mut-es.ac.ir" class="auth_mail" title="E-mail the corresponding author} ; H. Jamali
• 关键词：Nano-structured thermal barrier coating ; Corrosion ; Atmospheric plasma spray ; SYSZ ; YSZ ; V2O5
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：42
• 期：11
• 页码：12825-12837
• 全文大小：9331 K

文摘

The corrosion resistance of micro-and nano-structured scandia and yttria codoped zirconia (nano-4 mol%SYSZ and micro-8.6SYSZ) and yttria doped zirconia (4YSZ) in the presence of molten vanadium oxide were investigated. To this end, duplex TBCs (thermal barrier coatings), composed of a bond coat (NiCrAlY) and a top coat (4SYSZ or 4YSZ), were deposited on the IN738LC Ni-based supper-alloy by atmospheric plasma spraying (APS). The corrosion studies of plasma sprayed TBCs were conducted in 25 mg V₂O₅ molten salt at 910 °C for different times. The nanostructured coating, as compared to its micro-structured counterpart, in spite of a further reaction with the V₂O₅ salt, showed a higher degradation resistance during the corrosion test due to increased compliance capabilities resulting from the presence of an extra source of porosity associated with the nano-zones. Finally, the corrosion resistance and degradation mechanism of SYSZ and YSZ coatings were compared with the presence of molten NaVO₃ and V₂O₅ salt, respectively.