| ZHANG Wen-zhan,XIAO He,QIU Cheng,QIU Xiao-lin,QUAN Cai-bing,LIAO Dan,ZHOU Dong-lan,LIU Ding-rong,CHEN Qiu-xiang.Structural Design and Bonding Strength Variation of 8YSZ Thermal Barrier Coating[J],52(9):469-477 |
| Structural Design and Bonding Strength Variation of 8YSZ Thermal Barrier Coating |
| Received:August 02, 2022 Revised:February 06, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.09.043 |
| KeyWord:APS thermal barrier coatings 8YSZ microstructure bonding strength fracture location |
| Author | Institution |
| ZHANG Wen-zhan |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| XIAO He |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| QIU Cheng |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| QIU Xiao-lin |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| QUAN Cai-bing |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| LIAO Dan |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| ZHOU Dong-lan |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| LIU Ding-rong |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
| CHEN Qiu-xiang |
Graphene and Advanced Materials Laboratory,Key Laboratory of Jiangxi for Solar Photoelectric Materials Photovoltaic Cell Research Institute School of Electrical and Mechanical Engineering School of Aeronautics and Astronautics, Nanchang Institute of Technology, Nanchang , China |
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| Abstract: |
| The work aims to explore the effect of different thicknesses of bonding layer and ceramic layer on the bonding strength of 8YSZ thermal barrier coating by designing the structures of bonding layer and ceramic layer. With NiCoCrAlY heat-resistant alloy powder as the metal bonding layer raw material, and nano-agglomerated 8YSZ powder as the ceramic layer raw material, six kinds of double-layer structural coatings with NiCoCrAlY bonding layer thickness of 150 μm and 225 μm, and 8YSZ ceramic layer thickness of 200 μm, 400 μm and 600 μm were prepared on the surface of the Ti-6Al-4V alloy substrate by atmospheric plasma spraying technology. Before the experiments, the Taguchi method was used to find out the optimum process parameters for the coating of the metal bonding layer and the ceramic layer after several experiments. The phase composition, microstructure and chemical composition of sprayed powders and coatings were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM) and X-ray fluorescence analyzer (XRF). The bonding strength of six coatings with different thicknesses was measured and evaluated with a universal material testing machine. The 8YSZ ceramic powders with different thickness mainly transformed from the monoclinic phase (M) to the tetragonal phase (T) during the spraying process. The chemical composition of the NiCoCrAlY alloy powders and 8YSZ ceramic powders hardly changed before and after spraying process basically. It indicated that the ceramic powder was melted well during the spraying process. Meanwhile, the chemical composition of NiCoCrAlY alloy powder and 8YSZ ceramic powder remained basically unchanged before and after plasma spraying. In addition, thermal barrier coatings with different thickness showed typical layered structures, which included three kinds of complex states:completely molten state, semi-molten state and unmelted state. All these states had cracks and pores to various extents. The bonding strength was positively related to thickness of the bonding layer, and negatively related to thickness of the ceramic layer. Furthermore, as the thickness of the ceramic layer increases, the bonding strength decreases more slowly. Among all the coating samples, when the bonding layer was the thickest and the ceramic layer was the thinnest, the bonding strength of the coating was the largest, over 29.7 MPa. Otherwise, when the bonding layer was the thinnest and the ceramic layer was the thickest, the bonding strength of the coating was the lowest. From the analysis of the morphology and fracture location of the coating after fracture, it was clear that the location of the coating fracture was not related to the thickness of the bonding layer but to the thickness of the ceramic layer. When the thickness of the bonding layer was certain, the location of the coating fracture gradually shifted from between the bonding layer and the fixture to between the ceramic layer and the ceramic layer as the thickness of the ceramic layer increased. All results indicate that the thickness variation of bonding layer and ceramic layer of 8YSZ thermal barrier coatings has no obvious effect on the phase compositions and chemical compositions of the coatings, but have a significant effect on the bonding strength and fracture mode of the coatings. |
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