摘要
研究了等离子喷涂制备的MCrAlY(M=Ni、Co)涂层试样在1100℃高温条件下的氧化过程。结果表明涂层在1100℃条件下的恒温氧化动力学曲线基本符合抛物线规律,氧化速率常数kp=1.401×10-6mg-2.cm-4.s-1;氧化过程可分为3个阶段:初期的快速氧化阶段,此时形成物主要为θ-Al2O3;随着氧化时间延长,θ-Al2O3不断转变为α-Al2O3,形成连续的α-Al2O3薄膜,氧化反应进入相对稳定阶段;贫Al现象出现后,氧化产物相对来说比较复杂,甚至连性质相当稳定的Ni也被氧化生成NiO。
The high-temperature oxidation process of MCrAlY（M=Ni,Co）coatings by plasma spraying have been studied under 1100℃.The experimental results show that the oxidation kinetic curves of MCrAlY（M=Ni,Co）coatings by plasma spraying under 1100 ℃ obeyed the parabolic law,and the oxidation rate constant kp=1.401 ×10-6 mg-2·cm-4·s-1.Oxidation process can be thought three step： first stage,the oxidation rate was very fast,and main oxidate was θ-Al2O3;with time expanding,θ-Al2O3 changed into α-Al2O3 and the uninterrupted α-Al2O3 film formed,then,the oxidation rate become stable;the oxidate become comples when the phenomenon of poor Al appeared,even the element whit stable property-Ni have been oxidized into NiO.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第B11期947-949,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(50575220)
