Comparison of hot corrosion resistance of Sm2Zr2O7 and (Sm0.5Sc0.5)2Zr2O7 ceramics in Na2SO4+V2O5 molten salt. Issue 12 (September 2016)

• Record Type: Journal Article
• Authors: Guo, Lei; Li, Mingzhu; Ye, Fuxing
• Is Part Of: Ceramics international. Volume 42:Issue 12(2016)
• Page Start: 13849
• Page End: 13854
• Publication Date: 2016-09
• Subjects: Thermal barrier coating -- Sm2zr2o7 -- Sc2o3 -- Hot-corrosion -- Molten salt; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.05.190
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Sm2 Zr2 O7 and (Sm0.5 Sc0.5 )2 Zr2 O7 ceramics were fabricated by a chemical co-precipitation and calcination method, and their hot corrosion behaviors in Na2 SO4 +V2 O5 molten salt were investigated. Hot corrosion tests were carried at 700 °C, 800 °C and 900 °C for 4 h, and corroded surfaces were investigated using X-ray diffractometer and scanning electron microscopy. The corrosion products of Sm2 Zr2 O7 ceramics were composed of SmVO4 and monoclinic-ZrO2, while those of (Sm0.5 Sc0.5 )2 Zr2 O7 ceramic consisted of SmVO4 and Zr5 Sc2 O13 . Considering the fact that Zr5 Sc2 O13 is more desirable than monoclinic-ZrO2 for thermal barrier coating applications, (Sm0.5 Sc0.5 )2 Zr2 O7 showed better corrosion resistance to Na2 SO4 +V2 O5 salt than Sm2 Zr2 O7 . The hot corrosion mechanisms of Sm2 Zr2 O7 and (Sm0.5 Sc0.5 )2 Zr2 O7 in Na2 SO4 + V2 O5 salt were discussed in detail.