为了提高热障涂层的高温抗氧化性, 采用爆炸喷涂技术在M22合金上制备 了Ni-25Cr-5Al-0.5Y/Ni-50Al/ZrO2-8Y2O3 (质量分数, %)体系的热障涂层. 喷涂 态Ni-50Al(NiAl)扩散阻挡层由δ-Ni2Al3, β-NiAl和NiAl3组成. 对该涂层进行1050, 1100 和1150 ℃下的等温氧化, 研究了NiAl层对氧化膜生长机制的影响. 结果表明, NiCrAlY/NiAl/YSZ体系的氧化增重明显小于双层结构热障涂层的, 其氧化动力学 在1050和1100 ℃下符合四次方规律, 在1150 ℃下符合抛物线规律, NiAl层有 阻碍粘结层元素向外扩散、促进以Al2O3为主的氧化膜形成的作用.
In order to improve the oxidation resistance of thermal barrier coatings (TBCs), Ni-25Cr-5Al-0.5Y/Ni-50Al/ZrO2-8Y2O3 (mass fraction, %) system was deposited on the alloy M22 by detonation spray. Detonation sprayed Ni-50Al (NiAl) layer, as a diffusion barrier layer, is composed of δ-Ni2Al3, β-NiAl and NiAl3. Isothermal oxidation tests were carried at 1050, 1100 and 1150 ℃, in order to study the effect of NiAl layer on the growth mechanism of oxidation film. The results indicate that the mass gains of the triplex TBCs are obviously less than those of duplex TBCs at the above temperatures. The oxidation kinetics of triplex TBCs obeys the fourth power law at 1050 and 1100 ℃, and the parabolic law at 1150 ℃. NiAl layer can hinder the outward diffusion of elements in the bond coat and promote the formation of TGO consisted of Al2O3.
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