Oxidation behavior and mechanism of porous nickel-based alloy between 850 and 1000 °C  

一种多孔镍基合金在850~1000°C下的氧化行为和机理（英文）

作　　者：Yan WANG Yong LIU Hui-ping TANG Wei-jie LI Chao HAN 王岩;刘咏;汤慧萍;李维杰;韩朝(中南大学航空航天学院,长沙410083;中南大学粉末冶金国家重点实验室,长沙410083;西北有色金属研究院金属多孔材料国家重点实验室,西安710016;Institute for Superconducting and Electronic Materials,University of Wollongong,Wollongong,NSW 2522,Australia)

机构地区：[1]School of Aeronautics and Astronautics, Central South University, Changsha 410083, China [2]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China [3]State Key Laboratory of Porous Metals Materials,Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China [4]Institute for Superconducting and Electronic Materials,University of Wollongong, Wollongong, NSW 2522, Australia

出　　处：《Transactions of Nonferrous Metals Society of China》2017年第7期1558-1568,共11页中国有色金属学报（英文版）

基　　金：Project(51134003)supported by the National Natural Science Foundation of China

摘　　要：The oxidation behavior and mechanism of a porous Ni?Cr?Al?Fe alloy in the temperature range from850to1000°Cwere investigated by optical microscopy,scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS),X-raydiffraction(XRD)analyses and X-ray photoelectron spectroscopy(XPS).The results show that the oxidation kinetics at950and1000°C of this porous alloy is pseudo-parabolic type.Complex layers composed of external Cr2O3/NiCr2O4and internalα-Al2O3areformed on the surface of the oxidized porous alloys.γ?phases favor the formation of NiO/Cr2O3/NiCr2O4during the initial oxidation.Many fast diffusion paths contribute to the development of the oxide layers.The decrease of the open porosity and the permeabilitywith exposure time extending and temperature increasing can be controlled within a certain range.以一种多孔Ni-Cr-Al-Fe合金为研究对象,分别利用金相显微镜、扫描电子显微镜(SEM)及能谱仪(EDS)、X射线衍射(XRD)、X射线光电子能谱仪(XPS)等分析手段,研究其在850~1000°C温度范围内的氧化行为及机理。研究表明,该多孔合金在950°C和1000°C时呈伪抛物线型的氧化动力学曲线特征,其表面形成由外层Cr_2O_3/NiCr_2O_4和内层α-Al_2O_3构成的复杂氧化物结构。γ相的存在能促进氧化初期NiO/Cr_2O_3/NiCr_2O_4复合氧化物的形成,而多孔合金中众多快速扩散的通道有利于其氧化膜的发展。随着氧化时间的延长和氧化温度的升高,多孔合金的开孔率和渗透率均有所减小,但可控制在一定的范围内。

关 键 词：porous alloy high temperature oxidation KINETICS oxide layer DIFFUSION 

分 类 号：TB383.4[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—金属材料]