摘要
研究了NiAl-30.9Cr-3Mo-0.1Dy合金在1300K^1500K空气中的恒温氧化行为。结果表明:NiAl-30.9Cr-3Mo-0.1Dy合金的抗氧化性远优于NiAl-31Cr-3Mo合金;1500K的氧化动力学曲线基本遵循抛物线关系,在1350K^1450K的氧化动力学曲线符合立方抛物线关系,1300K的氧化动力学曲线则符合5次方关系。氧化过程中,合金的表面生成了连续致密的Al2O3氧化膜;稀土元素的活性作用以及Al2O3与基体合金之间的富Cr层的形成,提高了Al2O3的粘附能力。Dy的添加也减少了NiAl相上Al2O3的生成量,延缓了θ-Al2O3向α-Al2O3相的转变时间。
The isothermal oxidation behavior of NiAl-30.9Cr-3Mo-0.1Dy alloy at temperature range of 1300 K-1500 K in air atmosphere has been investigated in this paper. The results reveal that the oxidation resistance is much better than that of NiA1-31Cr-3Mo alloy and the adherence of Al2O3 film can greatly improved due to the formation of continuous and dense layer of Al2O3 formed on the surface of NiAl-30.9Cr-3Mo-0.1Dy alloy and the formation of Cr layer between Al2O3 and substrate. The kinetics of isothermal oxidation of NiAl-30.9Cr-3Mo-0.1Dy alloy obeys a parabolic rule at 1500 K, and follows the quintic equation at 1300 K and the cubic relation at 1350 K-1450 K. The small amount of Dy doped in NiAl-31Cr-3Mo alloy retards the transformation of θ-Al2O3 phase into α-Al2O3 phase, and decreases the amount of Al2O3 on NiAl phase. The mechanism of oxidation has been also discussed.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期719-723,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金重大项目(59895152)
"863"高技术项目(863-715-005-0030)资助
