摘要
利用 ＴＧＡ，ＸＲＤ，ＳＥＭ对铸造β－ＮｉＡｌ和ＮｉＡｌＹ合金以及溅射ＮｉＡｌ微晶涂层在１０００℃空气中的恒温及循环氧化行为进行了研究，三种材料的恒温氧化动力学均近似符合抛物线规律，氧化过程中都有相变发生，微晶化能够促使细小、紧密、单一完整的α－Ａｌ２Ｏ３氧化膜形成，同时微晶化与添加稀土元素Ｙ均明显提高循环氧化过程中氧化膜的粘附性。
The isothermal and cyclic oxidation behaviors of cast NiAl and NiAlY alloys and sputtered NiAl microcrystalline coating were investigated at 1000℃ in air by TGA, XRD and SEM. The isothermal oxidation kinetics of both NiAl and NiAlY alloys and NiAl microcrystalline coating follow the parabolic rate law. There also exists a phase transformation in the oxide scales from unstable θ-Al2O3 to α-Al2O3, which makes the stable oxidation rate decrease compared with that of the initial stage. The microcrystallization accelerated the phase transformation in the scales. Moreover, the microcrystallization, as well as the addition of Y significantly improved the scale adherence during cyclic oxidation.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第5期511-516,共6页
Acta Metallurgica Sinica
基金
国家杰出青年基金!59625103
国家863联合资助项目!715-011-012
关键词
Β-NIAL
氧化
微晶涂层
微晶化
稀土
β-NiAl,isothermal and cyclic oxidation, microcrystalline coating
