Investigation on Oxidation Resistance of NiCoCrAlY Coating Irradiated by High Current Pulsed Electron Beam
Investigation on Oxidation Resistance of NiCoCrAlY Coating Irradiated by High Current Pulsed Electron Beam
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DOI：
10.4028/www.scientific.net/msf.654-656.1936
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
X. Mei;Cunshan Wang;W. Qu;Ying Qin;C. Dong;You-nian Wang
中科院分区：
文献类型：
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作者：
X. Mei;Cunshan Wang;W. Qu;Ying Qin;C. Dong;You-nian Wang
本文采用低压等离子喷涂(LPPS)技术在DZ4镍基高温合金表面沉积了NiCoCrAlY粘结层，并用强流脉冲电子束(HCPEB)对涂层进行了辐照处理。用扫描电子显微镜、X射线衍射仪和能谱仪分析了经HCPEB处理的NiCoCrAlY涂层的相结构和微观结构。结果表明，经HCPEB处理后，涂层表面重新熔化，变得光滑，有凹坑喷发，涂层没有产生明显的残余应力。900℃静态空气中的等温氧化实验结果表明，经HCPEB处理后，涂层的抗氧化性明显提高，其氧化物主要为铝氧化物，但未经HCPEB处理的涂层的氧化物也有镍的氧化物。
In this paper, the NiCoCrAlY bond-coats was deposited onto the DZ4 nickel-based superalloy substrate by using low-pressure Plasma Spraying (LPPS) process, and then the coats were irradiated by high-current pulsed electron beam (HCPEB). Phase structures and microstructure of the HCPEB-treated NiCoCrAlY coating were analyzed by SEM, XRD and EDAX. The present results showed that the coating surface was remelted after HCPEB treatments, became smooth, had crater eruption, and the coating hadn’t produced distinct residual stresses. The results of the isothermal oxidations experiment performed in 900°C static air revealed that the oxidation resistance of the coating was enhanced obviously after HCPEB-treated and the oxides were mainly Aluminum-oxides, but without HCPEB-treated, the oxides of coating also had Nickel-oxides.