In situ Y 2 Si 2 O 7 coatings on Hi‐Nicalon‐S SiC fibers: Phase formation and fiber strength

Y 2 Si 2 O 7 coatings were formed on Hi‐Nicalon‐S SiC fibers by reaction of solution‐derived YPO 4 coatings with glass SiO 2 scales formed by fiber oxidation. Two oxidation methods were used: pre‐oxidation, where fibers were oxidized prior to YPO 4 coating, or post‐oxidation, where fibers were first...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2019-10, Vol.102 (10), p.5725-5737
Main Authors: Boakye, Emmanuel E., Mogilevsky, Pavel, Key, Thomas S., Parthasarathy, Triplicane A., Keller, Kristin A., Opeka, Samuel J., Hay, Randall S., Cinibulk, Michael K., Corns, Randall
Format: Article
Language:English
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Summary:Y 2 Si 2 O 7 coatings were formed on Hi‐Nicalon‐S SiC fibers by reaction of solution‐derived YPO 4 coatings with glass SiO 2 scales formed by fiber oxidation. Two oxidation methods were used: pre‐oxidation, where fibers were oxidized prior to YPO 4 coating, or post‐oxidation, where fibers were first coated with YPO 4 and then oxidized. Fibers with YPO 4 /SiO 2 films were heat‐treated in argon at 1200°C for 20 hours to react YPO 4 and SiO 2 to Y 2 Si 2 O 7 . The effects of SiO 2 to YPO 4 film thicknesses on fiber strength and on the Y 2 Si 2 O 7 formation kinetics were investigated. An optimized process to obtain single‐phase continuous Y 2 Si 2 O 7 coatings on Hi‐Nicalon‐S fibers with low loss in fiber strength is suggested.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.16428