논문 해외 국제전문학술지(SCI급) Oxidation behavior of Nb–Si–B alloys with the NbSi2 coating layer formed by a pack cementation technique
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2013-11
- 저자명 Jingchang Cheng a, Seonghoon Yi a,⁎, Joon Sik Park b
- 학술지명 Int. Journal of Refractory Metals and Hard Materials
- 발행처명 ELSEVIER
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 3
홈페이지
논문 초록 (Abstract)
The oxidation behavior of Nb–Si–B alloys with NbSi2 coating layers was investigated at 1100 °C under ambient atmosphere. Continuous NbSi2 layers with a thickness of 40–60 μm were coated by depositing Si on the alloy surfaces at 900 °C using a pack cementation technique. A sharp interface was observed between the NbSi2 layer and the pure Nb, while a (Nb5Si3 + T2) two-phase region formed between the NbSi2 layer and the alloy with the T2 phase composition. During oxidation, a glassy SiO2 layer formed significantly increasing the oxidation resistance of the coated alloys. However, evaporation of B occurred forming a porous SiO2 layer during the oxidation of the alloys with high B content. The oxidation behavior of the coated pure Nb and T2 phase alloys is discussed based on a microstructural analysis of the oxidized samples.