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Improved oxidation resistance of high emissivity coatings on fibrous ceramic for reusable space system

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arxiv 1902.03943 v2 pith:V2L5L3HU submitted 2019-02-11 physics.app-ph cond-mat.mtrl-sci

classification physics.app-phcond-mat.mtrl-sci
keywords coatingsemissivityfibroushighimprovedthermalceramicglass
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To develop high emissivity coatings on fibrous ceramic substrates with improved thermal resistance for reusable space systems, WSi2-MoSi2-Si-SiB6-borosilicate glass coatings were prepared on fibrous ZrO2 by slurry dipping and subsequent high temperature rapid sintering. A coating with 50 wt% WSi2 and 50 wt% MoSi2 presents optimal thermal stability with only 10.06 mg/cm2 mass loss and 4.0 % emissivity decrease in the wavelength regime of 1.27 to 1.73 microns after 50 h oxidation at 1773 K. The advantages of double phase metal silicide coatings combining WSi2 and MoSi2 include improved thermal compatibility with the substrate and an enhanced glass mediated self healing ability.

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