Stability of the Y2O3–SiO2 system in high‐temperature, high‐velocity water vapor. Issue 4 (2nd December 2019)

• Record Type: Journal Article
• Authors: Parker, Cory G.; Opila, Elizabeth J.
• Is Part Of: Journal of the American Ceramic Society. Volume 103:Issue 4(2020)
• Page Start: 2715
• Page End: 2726
• Publication Date: 2019-12-02
• Subjects: EBC -- steam volatility -- yttrium silicates; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16915
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: High‐temperature, high‐velocity water vapor (steam‐jet) exposures were conducted on Y2 O3, Y2 SiO5, Y2 Si2 O7, and SiO2 for 60 hours at 1400°C. Volatility of Y2 O3 was not observed. Phase‐pure Y2 SiO5 exhibited SiO2 loss forming Y2 O3 and porosity. A mixed porous and dense Y2 SiO5 layer formed on the surface of Y2 Si2 O7 due to SiO2 depletion. The mechanisms and kinetics of the reaction between SiO2 and H2 O(g) to form Si(OH)4 (g) from Y2 SiO5, Y2 Si2 O7, and SiO2 are discussed.