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Stability of the Y 2 O 3 –SiO 2 system in high‐temperature, high‐velocity water vapor
Author(s) -
Parker Cory G.,
Opila Elizabeth J.
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16915
Subject(s) - volatility (finance) , water vapor , materials science , analytical chemistry (journal) , porosity , mineralogy , kinetics , chemistry , composite material , physics , organic chemistry , chromatography , quantum mechanics , financial economics , economics
High‐temperature, high‐velocity water vapor (steam‐jet) exposures were conducted on Y 2 O 3 , Y 2 SiO 5 , Y 2 Si 2 O 7 , and SiO 2 for 60 hours at 1400°C. Volatility of Y 2 O 3 was not observed. Phase‐pure Y 2 SiO 5 exhibited SiO 2 loss forming Y 2 O 3 and porosity. A mixed porous and dense Y 2 SiO 5 layer formed on the surface of Y 2 Si 2 O 7 due to SiO 2 depletion. The mechanisms and kinetics of the reaction between SiO 2 and H 2 O(g) to form Si(OH) 4 (g) from Y 2 SiO 5 , Y 2 Si 2 O 7 , and SiO 2 are discussed.
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