河北师范大学学报—

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刊名：河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
主办：河北师范大学
ISSN： 1000-5854
CN： 13-1061/N
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强流脉冲电子束作用下CoCrAlY熔敷铝膜的表面微观形貌和元素分布

中国民航大学天津市民用航空器适航与维修重点实验室, 天津 300300
DOI： 10.13763/j.cnki.jhebnu.nse.2017.02.008

The Distribution of Element and Morphology of Aluminized CoCrAlY Coating Irradiated by HCPEB

HAN Zhiyong, HAN Jian

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摘要/Abstract

摘要：

采用大气等离子喷涂在镍基高温合金表层制备CoCrAlY涂层，采用物理气相技术在其表面沉积纳米级铝膜，再使用强流脉冲电子束对表层镀铝后的涂层进行辐照处理，获得表层富Al的涂层.并进行了表面化学元素能谱及形貌分析.形貌分析表明，粘结层表层铝膜熔敷可以消除原始涂层的未熔颗粒、空隙以及孔洞等缺陷，获得致密且连续的胞状凸起，使得涂层粗糙度适当增加；表面能谱分析表明，表层的凹区形成了Al₂O₃，凸起区域又存在含有氧化铝的CoAl相.表面处理后的表面形貌和表层元素有利于提高涂层抗氧化性能和热震寿命.

Abstract：

Abstract: A CoCrAlY coating is prepared on the substrate, which is Ni-based super alloy (GH4169), by air plasma spray. After deposition, a nano-scale Al film is deposited with EBVD above the coatings.Then, the composite coating is irradiated by high current pulsed electron beam. The coating is investigated by SEM and EDS. SEM results show that the original coating with defects, like non-melten particle, porosity and cavities, is replaced with a compact appearance of interconnected bulged nodules after HCPEB treatment. The coating roughness is also increased. The analysis of EDS reveals that the bulged region has CoAl phase containing alumina and Al₂O₃ formed between them. The changes of the morphology and distribution of element improve the coating oxidation resistance and increase the thermal shock life.

关键词

关键词： CoCrAlY涂层 ; 强流脉冲电子束 ; 微观形貌 ; 元素分布

Key words： CoCrAlY coating ; high current pulsed electron beam ; morphology ; distribution of element

参考文献 14

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