Mullite–gadolinium silicate environmental barrier coatings for melt infiltrated SiC/SiC composites
作者： Sivakumar Ramasamy , Surendra N. Tewari , Kang N. Lee , Ramakrishna T. Bhatt , Dennis S. Fox
DOI: 10.1016/J.SURFCOAT.2010.12.031
关键词: Mullite 、 Silicate 、 Coating 、 Temperature cycling 、 Layer (electronics) 、 Oxide 、 Materials science 、 Composite material 、 Sintering 、 Silicon carbide 、 Materials Chemistry 、 General chemistry 、 Surfaces, Coatings and Films 、 Surfaces and Interfaces 、 Condensed matter physics
摘要: Abstract Slurry based mullite/gadolinium silicate (Gd 2 SiO 5 ) environmental barrier coatings (EBCs) were developed for melt infiltrated (MI) SiC/SiC composites. The coating chemically adhered well on the substrates. Thermal cycling of uncoated MI-SiC/SiC composites conducted between 1350 °C and 90 °C (one hour hot 15 min cold) in a 96.5% H O–3.5% O environment caused severe oxidation damage after 100 cycles resulting formation dense silica layer about 25 μm maximum thickness. Mullite/Gd EBCs provided excellent protection to against moisture with significantly less substrate; only 2 μm thick oxide formed even 400 similar thermal cycles. hair-line cracks at coating/substrate interface causing partial de-lamination.
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