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Melting and Crystallization of Silicate Systems Relevant to Thermal Barrier Coating Damage
Author(s) -
Zaleski Elisa M.,
Ensslen Charlotte,
Levi Carlos G.
Publication year - 2015
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.13478
Subject(s) - crystallization , solidus , materials science , silicate , thermal barrier coating , metastability , ternary operation , chemical engineering , amorphous solid , phase (matter) , degradation (telecommunications) , mineralogy , metallurgy , ceramic , crystallography , chemistry , alloy , telecommunications , organic chemistry , computer science , engineering , programming language
The melting and crystallization behaviors of model calcium–magnesium–alumino‐silicate ( CMAS ) compositions relevant to the degradation of thermal barrier coatings ( TBC s) were investigated. A primary goal was to establish a baseline for studies on CMAS reactions with TBC materials, reported separately, and their potential to mitigate degradation. Ternary calcium alumino‐silicate (CAS) compositions investigated melt below their equilibrium solidus owing to their metastable phase constitution. Additions of MgO or FeO x have significant effects on the melting behavior, depending on the C:A:S proportions. Amorphization on cooling is commonplace, with MgO , AlO 1.5 , and especially FeO x promoting crystallization. The behaviors of amorphous and crystalline versions of the same CMAS are different and depend on heating/cooling rates, with attendant implications for their interaction with TBC s.