Corrosion behavior of plasma-sprayed Al2O3-Cr2O3 coatings in hot lithium molten salt
Corrosion behavior of plasma-sprayed Al2O3-Cr2O3 coatings in hot lithium molten salt
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DOI：
10.1016/j.jnucmat.2010.01.022
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
Soo-Haeng Cho;Sung Bin Park;D. Kang;M. Jeong;Heong Park;J. Hur;Hansoo Lee
中科院分区：
文献类型：
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作者：
Soo-Haeng Cho;Sung Bin Park;D. Kang;M. Jeong;Heong Park;J. Hur;Hansoo Lee
在这项研究中，在氧化气氛下暴露于熔融氯化锂环境在675°C下216小时后，对裸高温合金试样以及涂覆的高温合金试样进行热腐蚀研究。在IN 713 LC高温合金试样的基体上喷涂NiCrAlY渗铝粘结层，然后喷涂Al 2 O3-Cr2 O3面层。采用光学显微镜（OM）、扫描电子显微镜（SEM）/X射线能谱仪（EDS）和X射线衍射仪（XRD）分别对涂层和试验样品进行了分析。裸高温合金的失重明显，由于氧化皮的快速生长和热应力的作用，裸高温合金表面形成的氧化皮剥落。当LiCl-3wt%存在时，顶层涂层显示出更好的耐热腐蚀性Li 2 O熔盐与未涂覆的高温合金和渗铝粘结涂层相比。已发现这些涂层有益于提高用于处理高温锂熔融盐的结构材料的耐热腐蚀性。
In this study, hot corrosion studies were performed on bare as well as coated superalloy specimens after exposure to molten lithium chloride environment at 675°C for 216h under an oxidizing atmosphere. The substrates of the IN713LC superalloy specimens were sprayed with an aluminized NiCrAlY bond coat and then with an Al2O3–Cr2O3top coat. The as - coated and tested specimens were examined by optical microscopy (OM), scanning electron microscopy (SEM)/X-ray energy dispersive spectrometry (EDS) and X-ray diffraction (XRD), respectively. The bare superalloy reveals an obvious weight loss, and the scale formed on the surface of the bare superalloy was spalled due to the rapid scale growth and thermal stress. The top coatings showed a much better hot corrosion resistance in the presence of LiCl–3wt.% Li2O molten salt when compared with those of the uncoated superalloy and the aluminized bond coatings. These coatings have been found to be beneficial for increasing to the hot corrosion resistance of the structural materials for handling high temperature lithium molten salts.