Cyclic oxidation behavior of Fe-Cr modified slurry silicide coated Nb-18.7Si alloyed with Ti and Zr
Source abstract
Abstract
Abstract The Nbss/Nb3Si-Nb5Si3 alloys exhibit good high-temperature strength and creep resistance, and are candidate high-temperature materials for hypersonic aerospace applications. However, their poor oxidation resistance necessitates the application of protective coatings.The present study examines the comparative cyclic oxidation behavior of uncoated and Fe-Cr modified slurry silicide coated Nb-18.7Si, Nb-18.7Si-5Ti and Nb-18.7Si-5Zr (in at.%) alloys in air at temperatures between 800–1400 °C. The uncoated samples showed extensive loose-scale formation from the initial stages of oxidation. On the other hand, the protective multi-phase oxide scale formed on the coating surface prevented dimensional degradation for at least 5–7 h at high temperatures of 1400 °C.
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Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · Advanced ceramic materials synthesis · MXene and MAX Phase Materials
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