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  4. Wet chemical deposition of BN, SiC and Si3N4 interphases on SiC fibers
 
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2021
Journal Article
Title

Wet chemical deposition of BN, SiC and Si3N4 interphases on SiC fibers

Abstract
Fiber coatings based on BN, BN/SiC and BN/Si3N4 were deposited on Hi Nicalon type S SiC fibers. The coating parameters were optimized using a design of experiments study. With optimized parameter sets, the coatings exhibited a high degree of coverage on the fibers and almost no fiber bridging could be observed. The coated fiber bundles are flexible and can be processed further by techniques such as filament winding. In comparison to a non-processed reference sample, the maximum tensile load of the fiber bundles with BN, BN/SiC and BN/Si3N4 coatings was reduced by only 5 %, 13 % and 10 %, respectively. The coated fiber bundles retained their tensile strength after thermal annealing up to 1650 °C in a nitrogen atmosphere for 0.5 h. SiCf/SiC samples with BN/SiC fiber coatings exhibited higher values of bending strength and strain-to-failure as a reference sample without fiber coating indicating the functionality of the fiber coatings.
Author(s)
Nöth, Andreas  
Fraunhofer-Institut für Silicatforschung ISC  
Maier, Jonathan  
Fraunhofer-Institut für Silicatforschung ISC  
Schönfeld, Katrin  
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Klemm, Hagen
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Journal
Journal of the European Ceramic Society  
Funder
Bayerisches Staatsministerium für Wirtschaft, Landesentwicklung und Energie StMWi  
DOI
10.1016/j.jeurceramsoc.2020.06.013
Language
English
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS  
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • SiC

  • ceramic matrix composites

  • interface

  • coating

  • solid electrolyte interphase

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