Preparation of plasma sprayed nanostructured GdPO4 thermal barrier coating and its hot corrosion behavior in molten salts. Issue 10 (July 2017)

• Record Type: Journal Article
• Authors: Li, Mingzhu; Cheng, Yuxian; Guo, Lei; Zhang, Chenglong; Zhang, Yuchen; He, Sixian; Ye, Fuxing
• Is Part Of: Ceramics international. Volume 43:Issue 10(2017)
• Page Start: 7797
• Page End: 7803
• Publication Date: 2017-07
• Subjects: Thermal barrier coatings (TBCs) -- Air plasma spraying (APS) -- Nanostructure -- Hot corrosion -- Molten salts; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.03.092
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Nanostructured GdPO4 coatings, designed as the outer layer of double-ceramic-layer thermal barrier coatings (DCL-TBCs), were produced by air plasma spraying (APS). The coatings have close chemical composition to that of the agglomerated particles used for thermal spray. Nanozones with porous structure are embedded in the coating microstructure, having a percentage of ~30%. Hot corrosion tests of the coatings were carried out in V2 O5 and Na2 SO4 +V2 O5 salts at 900 °C for 4 h. Results indicate that dense reaction layers, consisting of GdVO4 and Gd4 (P2 O7 )3, form on the coating surfaces, which could suppress further penetration of the molten salts. In the V2 O5 molten salt, the reaction layer is thicker and less molten salt trace could be found beneath the layer.