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In situ Y 2 Si 2 O 7 coatings on SiC fibers: Thermodynamic analysis and processing
Author(s) -
Mogilevsky Pavel,
Boakye Emmanuel E.,
Key Thomas S.,
Parthasarathy Triplicane A.,
Hay Randall S.,
Cinibulk Michael K.
Publication year - 2019
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.15905
Subject(s) - materials science , composite material , composite number , coating , fiber , deposition (geology) , in situ , degradation (telecommunications) , paleontology , telecommunications , physics , sediment , meteorology , computer science , biology
It is shown using thermodynamic analysis and kinetic modeling that a processing window exists for the formation of Y 2 Si 2 O 7 coatings on SiC. The proposed method is validated using an experimental procedure in which the in situ formation of Y 2 Si 2 O 7 on a commercial SiC‐based fiber is demonstrated. The method involves the deposition of YPO 4 on preoxidized fine diameter SiC‐based fibers, and heat treating the coated fibers within a calculated processing window of oxygen partial pressure, temperature, degree of preoxidation, and coating thickness. The results are promising for the development of environmentally resistant interfacial coatings for SiC‐fiber reinforced SiC‐based matrix composites. The proposed and validated approach allows a low‐cost method to obtain continuous hermetic coatings on SiC fibers with interfacial properties adequate for tough composite behavior that resists degradation under turbine engine conditions.