等离子喷涂工艺参数对GdPO_4热障涂层组织结构和结合强度的影响
Effects of air plasma spraying parameters on microstructure and bonding strength of GdPO_4 thermal barrier coatings
查看参考文献29篇
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文摘
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随着航空发动机涡轮进口温度提升,目前最广泛使用的Y_2O_3部分稳定ZrO_2(YSZ)热障涂层(TBCs)已难以满足需求,亟须发展新一代超高温TBCs。GdPO_4是一种极具应用前景的TBCs材料。本工作采用等离子喷涂方法制备GdPO_4/YSZ双陶瓷层结构TBCs,研究喷涂工艺参数特别是喷涂功率对GdPO_4陶瓷涂层相组成、表面形貌、微观结构以及结合强度的影响。结果表明:等离子喷涂GdPO_4过程中会有元素P损耗,得到的涂层除了GdPO_4外,还有一些Gd_3PO_7相;随着喷涂功率降低,Gd_3PO_7相含量减少;GdPO_4陶瓷涂层的主体结构由充分熔融的喷涂粒子堆垛构成,其中镶嵌有未熔化粒子构成的微区;随着喷涂功率降低,未熔化微区增多,涂层厚度降低; GdPO_4/YSZ TBCs的结合强度随喷涂功率降低而减小,主要是由于未熔化微区增多降低了涂层的内聚力;因此,低喷涂功率不利于涂层的结合强度。 |
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其他语种文摘
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With the increase of the turbine inlet temperature of gas engines, the widely used Y_2O_3 partially stabilized ZrO_2(YSZ) thermal barrier coatings (TBCs) have been unable to meet the requirements, and new generation TBCs that can survive ultra hightemperatures are urgently needed. Among many TBC candidates, GdPO_4 has a great application prospect. In this study, GdPO_4/YSZ TBCs were prepared by air plasma spraying, and the effects of preparation parameters, especially spraying power on the phase composition, surface morphology, microstructure and bond strength of GdPO_4 coatings were investigated. The results show that the P loss takes place during spraying, and both GdPO_4 and Gd_3PO_7 phases are detectable in the final topcoats, the content of the latter decreases by reducing the spraying power. The GdPO_4 coating microstructure is mainly composed of piles of fully melted spray particles, among which there is porous micro-zone consisting of unmelted particles. With the decrease of the spraying power, the content of the micro-zone increases, and the coating thickness significantly decreases. The bonding strength of GdPO_4/YSZ TBCs decreases with the decrease of spraying power, which is mainly because the cohesion of coating decreases with the increase of unmelted micro-zone. Therefore, low spraying power is not beneficial to the coating bonding strength. |
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来源
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航空材料学报
,2022,42(1):25-32 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2021.000162
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关键词
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热障涂层
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GdPO_4
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等离子喷涂
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相组成
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微观结构
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结合强度
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地址
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中国航发沈阳黎明航空发动机有限责任公司, 沈阳, 110043
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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航空 |
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基金
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国家重大科技专项
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辽宁省“兴辽英才计划”项目
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沈阳市中青年科技创新人才支持计划项目
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文献收藏号
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CSCD:7182249
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