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

Gaofeng Shao (1, 2) , Yucao Lu (1) , Dorian A.H. Hanaor (2) , Sheng Cui (1) , Jian Jiao (3) , Xiaodong Shen (1)

1 State Key Laboratory of Materials-Oriented Chemical Engineering
2 TU - Technical University of Berlin / Technische Universität Berlin
3 Institute of Aeronautical Materials [Beijing]

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 20 wt% WSi2 and 50 wt% MoSi2 presents optimal thermal stability with only 10.06 mg/cm 2 mass loss and 4.0% emissivity decrease in the wavelength regime 1.27-1.73 μm 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.

Mots clés: glass; emissivity; XPS; Oxidation; Oxide coatings; heat shield; WSi2; MoSi2

Domaines: Physique de l'espace [physics.space-ph]; Science des matériaux [cond-mat.mtrl-sci]; Sciences de l'ingénieur [physics]; Matériaux

Gaofeng Shao, Yucao Lu, Dorian A.H. Hanaor, Sheng Cui, Jian Jiao, et al.. Improved oxidation resistance of high emissivity coatings on fibrous ceramic for reusable space systems Improved oxidation resistance of high emissivity coatings on fibrous ceramic for reusable space systems. Corrosion Science, 2019, 146, pp.233-246. ⟨10.1016/j.corsci.2018.11.006⟩. ⟨hal-02308467⟩