李文生,王裕熙.NiCoCrAlY粘结层喷涂工艺对8YSZ热障涂层抗氧化性能的影响[J].表面技术,2019,48(8):263-271.
LI Wen-sheng,WANG Yu-xi.Influence of NiCoCrAlY Spraying Process on Oxidation Resistance of 8YSZ Thermal Barrier Coatings[J].Surface Technology,2019,48(8):263-271
NiCoCrAlY粘结层喷涂工艺对8YSZ热障涂层抗氧化性能的影响
Influence of NiCoCrAlY Spraying Process on Oxidation Resistance of 8YSZ Thermal Barrier Coatings
投稿时间:2018-12-19  修订日期:2019-08-20
DOI:10.16490/j.cnki.issn.1001-3660.2019.08.035
中文关键词:  热障涂层  爆炸喷涂  等离子喷涂  高温氧化  热生长氧化物
英文关键词:thermal barrier coatings  detonation spraying  plasma spraying  thermal growth oxide
基金项目:国家国际科技合作项目(2015DRF51090);国家自然科学基金(51674130)
作者单位
李文生 兰州理工大学 a.材料科学与工程学院 b.省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050 
王裕熙 兰州理工大学 a.材料科学与工程学院,兰州 730050 
AuthorInstitution
LI Wen-sheng a.School of Materials Science and Engineering, b.State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 
WANG Yu-xi a.School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China 
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中文摘要:
      目的 提高热障涂层粘结层的抗高温氧化性能。方法 分别采用爆炸喷涂和等离子喷涂工艺制备了不同结构的NiCoCrAlY粘结层,之后通过等离子喷涂制备8YSZ陶瓷层,分析了两种粘结层结构的热障涂层的抗高温氧化性能。利用XRD、SEM和EDS对涂层物相、微观结构和成分进行分析,并对其与基体结合状态、抗高温氧化性能进行研究。结果 爆炸喷涂粘结层内部组织致密,缺陷较少,与基体结合处孔隙少;而等离子喷涂粘结层内部的层状特征明显,孔隙较多,表面粗糙度较低。爆炸喷涂粘结层氧化5 h后,表面生成了一层富Al2O3的致密氧化物膜;而等离子喷涂粘结层表面形成了富NiO、CoO、Cr2O3和Ni(Cr,Al)2O4的氧化物层,并出现了许多微裂纹和片层状氧化物。爆炸喷涂制备的热障涂层试样在前5 h氧化增重速率高于等离子喷涂试样,随后变平缓,而等离子喷涂试样氧化速率依然较高。爆炸喷涂热障涂层的热生长氧化物层(Thermally grown oxide, TGO)经50 h氧化后,仍呈连续状,厚度均匀,粘结层内氧化物缺陷较少。结论 爆炸喷涂粘结层组织均匀、致密,喷涂时涂层的氧化以及热处理的内氧化较少,使得足够的Al较快速地在粘结层表面形成致密的氧化铝,表面一定厚度的氧化铝层抑制了氧和其他金属原子的相向扩散反应,提高了涂层的抗高温氧化性能。
英文摘要:
      The work aims to improve the high temperature oxidation resistance of thermal barrier coatings. NiCoCrAlY bond coats with different structures were prepared by detonation spraying (DS) and air plasma spraying (APS). Then, 8YSZ ceramic coatings was prepared by APS to analyze the high temperature oxidation resistance of thermal barrier coatings on bond coats with two different structures. The phase composition, microstructure and chemical composition of coatings were analyzed by X-ray diffraction, scanning electronic microscopy and energy disperse spectroscopy. The interfaces between the coatings and substrate and high temperature oxidation resistance of TBCs were investigated. DS-bond coat was dense and uniform and had less internal defects and interfacial pores with substrate, while the APS-bond coat presented more pores and low surface roughness and apparently exhibited a layered structure. A layer of Al2O3-rich oxide was formed on the surface of DS-bond coat after oxidation for 5 hours, while a layer of mix oxides (e.g. NiO, CoO, Cr2O3 and Ni(Cr,Al)2O4) was formed on the surface of APS-bond coat. Additionally, a number of micro cracks and layered oxides were found in the APS-bond coat. The weight gain of DS thermal barrier coating sample was faster than that of the APS sample in the first 5 hours oxidation and then became slowly, while the APS thermal barrier coating sample still showed high oxidation rate. Thermally grown oxide (TGO) of detonation sprayed coating still remained uniform oxide layer after 50 h oxidation. TGO layer closed to bond coat had less oxide defect. The bond coat of detonation sprayed coating has uniform and dense structure, thus preventing the oxidation during spraying and inner-oxidation during heat treatment, and promoting the formation of a dense Al2O3 layer. Finally, the diffusion between oxygen and metal atom is suppressed and the high temperature oxidation resistance of TBCs is improved dramatically.
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