논문 해외 국제전문학술지(SCI급) Degradation Properties of Refractory MoNbTaVW High‑Entropy Alloys with Simultaneous Si/Al PackCementation Coatings Under High‑Temperature FlameTests
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2021-07
- 저자명 Wonchul Yang1 · Kwangsu Choi1,2 · Chansik Choi1 · Joon Sik Park1
- 학술지명 Oxidation of Metals
- 발행처명 SPRINGER LINK
- 발행국가 해외
- 논문언어 외국어
홈페이지
논문 초록 (Abstract)
This paper aims to improve the oxidation resistance of MoNbTaVW (at%) refractory high-entropy alloys after flame tests at 1350 ℃ with Si/Al pack cementation coatings. After the Si/Al pack cementation coatings were applied, a coating layer of about 80 μm with a sequence of Si-rich layer (silicide)/interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer was formed. After the flame tests at 1350 °C for 20 min, the uncoated specimens formed composite oxides of Nb2O5 (s), Ta2O5 (s), and V2O5 (s) with porosity of MoO3 (g) and WO3 (g) with a weight gain. On the other hand, the Si/Al coated specimens were composed of Si-rich layer (silicide)/interdiffusion layer/Al-rich layer (aluminide)/Al diffusion layer. After the flame tests, SiO2 and Al2O3 ceramic protective layers were formed on the surface and prevented additional oxidation. The oxidation behaviors of MoNbTaVW alloys and the Si/Al pack cementation coated alloys were discussed with microstructures and phase development.