Effects of Cr addition on the microstructures and oxidation of Nb-Si-Al-Ti-W alloys

3rd International Conference on New Material and Chemical Industry

材料科学;化学工业

Long, W.Y.^1 ; Jia, H.M.^1

College of Aeronautical Manufacuring Engineering, Nanchang Hangkong University, Nanchang

330063, China^1

关键词: Compact structures;    Cr addition;    Oxidation kinetics;    Oxide scale;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/479/1/012072/pdf
DOI  :  10.1088/1757-899X/479/1/012072

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The effects of Cr addition on the microstructures and oxidation kinetics of the Nb-20Si-5Al-15Ti-5W alloys have been investigated in this study. The alloys were prepared by Spark Plasma Sintering (SPS) technology. The results show that the microstructure of the alloys consists of (Nb, Ti, W)ss, α-Nb5Si3, γ-Nb5Si3 and (Nb, Ti)5Si3 phase. The addition of 3at% Cr improves the oxidation resistance of the composite at 800°C and 1100°C dramatically. The AlNb11O29, Ti2Nb10O29, TiO2, Nb2O5, Cr2Ti6O15, and Nb4W3O47 are present in the scales formed at 800°C. The phases present in the oxide scales formed at 1100°C consisted of AlNb11O29, Ti2Nb10O29, TiO2, Cr2WO6, and Nb2O5. The oxidation resistance of the composite at 1100°C is better than at 800°C because the oxide scale is more compact structure.