Oxidation behaviour of the nickel-based superalloy DZ125 hot-dipped with Al coatings doped by Si

Oxidation behaviour of the nickel-based superalloy DZ125 hot-dipped with Al coatings doped by Si
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镍基高温合金DZ125热浸镀Si掺杂Al镀层的氧化行为

DOI:
10.1016/j.corsci.2016.07.020
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发表时间:
2016-11
期刊:
影响因子:
8.3
通讯作者:
Lu Jiansheng
Lu Jiansheng
中科院分区:
材料科学1区
文献类型:
--
作者:
Zang Junjie;Song Peng;Feng Jing;Xiong Xiping;Chen Rong;Liu Guangliang;Lu Jiansheng

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采用热浸镀法在DZ 125高温合金表面制备了纯Al涂层和Al-Si涂层。Al-Si涂层由于形成了更为致密的Al 2 O3层,因而比纯Al涂层具有更好的抗热氧化性能。Al-Si涂层经850 °C氩气热处理后,形成了以硅铝为基体的Ta 5Si 3和AlHfSi相。该层是循环氧化过程中氧和其他金属元素扩散的屏障,对致密Al 2 O3层的形成有重要影响。
A pure Al coating and Al-Si coating were prepared on the surface of the DZ125 superalloy by hot-dipping. The Al-Si coating provides better thermal oxidation resistance than that of the pure Al coating due to the formation of a more compact Al2O3layer. The microstructure of the Al-Si coating shows a silicon-aluminium-based layer with Ta5Si3and AlHfSi phase forms after heat treatment in argon at 850 °C. This layer is a barrier to the diffusion of oxygen and other metal elements during cyclic oxidation, which has a significant effect on the formation of the compact Al2O3layer.
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