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Deposition of Oxide Coatings on Fiber Cloths by Electrostatic Attraction
Author(s) -
Cinibulk Michael K.
Publication year - 1997
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/j.1151-2916.1997.tb02851.x
Subject(s) - wetting , coating , materials science , composite material , fiber , mullite , bridging (networking) , aqueous solution , oxide , deposition (geology) , chemical engineering , chemistry , ceramic , metallurgy , computer network , paleontology , sediment , computer science , engineering , biology
Electrostatic attraction has been used to deposit alumina and mullite coatings onto woven cloths of Nicalon fiber. This approach produced uniformly coated cloths while minimizing the dependence on the wetting relationship between the fiber and the coating precursor. The use of low sol concentrations (#1 g/L) facilitated the removal of excess sol from the cloth. Water was used to further displace excess aqueous sol from the cloth to give minimal fiberfiber bridging while maintaining uniform fiber coatings. The use of a polyelectrolyte enabled multiple deposition of coatings onto the fibers in the cloth. Multiple coating steps resulted in completely coated fiber surfaces; coverage was limited to 50% with only a single coating step. Vacuum infiltration was necessary to remove entrapped air from the cloths during coating. A discussion of wetting and infiltration of fiber cloths has been presented, which highlights issues that are critical for obtaining uniformly coated fibers and minimal fiber bridging in a woven‐fiber cloth or preform.