| 引用本文: | 何箐,由晓明,邹晗,张雨生,姜在龙,张云杰.不同制备工艺参数对PS-PVD-8YSZ涂层微结构及性能的影响[J].中国表面工程,2024,37(4):192~205 |
| HE Qing,YOU Xiaoming,ZOU Han,ZHANG Yusheng,JIANG Zailong,ZHANG Yunjie.Effect of Different Thermal Spray Process Parameters on the Microstructure and Properties of PS-PVD 8YSZ Coatings[J].China Surface Engineering,2024,37(4):192~205 |
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| 摘要: |
| 作为新型热障涂层工艺制备技术，等离子物理气相沉积（PS-PVD）射流具有高能高速等特性，涂层沉积时存在扰流作用导致涂层微结构及性能的显著影响。为了减少圆柱体工装扰流作用，掌握工艺参数对涂层微结构的基本影响规律，采用平面工装系统研究不同 PS-PVD 工艺参数下，如喷涂电流、送粉量、喷枪摆动及样品旋转参数等对涂层微结构的影响规律。 研究结果表明：送粉量和喷枪-样品相对运动参数对涂层微结构影响较大，可快速实现涂层微结构的调控；喷涂电流的变化通过柱状晶尺寸和冷凝纳米颗粒含量等方面影响涂层微结构，涂层显微硬度随喷涂电流增大而降低；喷涂沉积距离的影响较小， 喷涂距离增大使沉积效率和柱状晶发散生长程度降低，冷凝纳米颗粒含量提高，同时涂层显微硬度呈现先降低后升高的趋势。 JL-11NP 粉末表现出宽幅工艺范围内准柱状结构的获得能力，进一步掌握低沉积电流工艺条件下基于气-固-液三相复合沉积的影响规律。开展了低电流工艺参数条件下 PS-PVD 涂层的微结构调控及沉积机制研究，研究成果可为兼顾隔热和寿命、抗冲蚀的涂层性能结构优化及调控奠定良好基础。 |
| 关键词: 8YSZ 涂层 等离子物理气相沉积 工艺参数 微结构 显微硬度 |
| DOI：10.11933/j.issn.1007-9289.20230908001 |
| 分类号:TQ174 |
| 基金项目: |
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| Effect of Different Thermal Spray Process Parameters on the Microstructure and Properties of PS-PVD 8YSZ Coatings |
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HE Qing1，2，YOU Xiaoming1，2，ZOU Han1，2，ZHANG Yusheng1，2，JIANG Zailong1，2，ZHANG Yunjie1
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1.Chinese Academy of Agricultural Mechanization Science Group Co., Ltd., Beijing 100083 , China ；2.Beijing Jinlunkuntian Special Machine Co.Ltd., Beijing 100083 , China
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| Abstract: |
| Plasma spray-physical vapor deposition (PS-PVD) technology, invented at the beginning of this century, has been widely studied because of its non-line-of-sight deposition and high efficiency in the preparation of columnar and quasi-columnar structure coatings. Coatings prepared using this technology show characteristics of high thermal insulation and long life cycles. A jet with high PS-PVD energy and speed causes coating deposition during turbulent effects, which significantly influence the microstructure and performance of the coating. The coating performance depends on the interface control and microstructural coating characteristics. To verify the influence of the spraying deposition process on the coating microstructure and reduce the influence of cylindrical tooling, different PS-PVD process parameters, such as the spraying current, powder feed rate, spray gun swing, and sample rotation parameters, were studied using a planar tooling system. Additionally, the influence of different process parameters on the microstructure and microhardness of the coating was verified, particularly for relatively small turbulence conditions during cylindrical tool rotations. By using the autonomous PS-PVD powder with a particle size range of 1-20 μm—at a low-deposition-current range of 1.6-2.1 kA and a wide deposition distance of 0.9-2.0 m—it was systematically verified that the powder had a wide process window, as well as the ability to obtain a quasi-columnar structure coating with different microstructures. The effects of the deposition parameters on the microstructure and microhardness of the coating were systematically analyzed, and the formation mechanism of the coating under the low-current deposition mode was revealed. The results showed that the powder-feed rate and relative movement parameters of the spray gun sample had a considerable influence on the coating microstructure, contributing to its rapid control. The increase in the spray gun swing rate may be due to jet dragging when producing a certain mass of particle filtering, thereby reducing the content of condensing particles in the coating. A change in the spraying current affects the microstructure of the coating through the dimensions of the columnar crystals and the content of condensing nanoparticles. The increased spray deposition current increased the vapor-phase concentration in the jet, which increased the deposition rate of the coating and reduced the content of condensing nanoparticles in the columnar gap. This refined the size of the columnar crystals and reduced the microhardness of the coating. With an increase in spraying distance, the deposition rate decreased significantly, whereas the coating microhardness first decreased and then increased. As the spraying distance increased, the deposition efficiency and divergent growth of the columnar crystals decreased, and the content of condensed nanoparticles increased. However, the microhardness of the coating initially decreased and then increased. JL-11NP powder shows the ability to acquire a quasi-columnar structure over a wide process range, which further reveals the deposition mechanism based on gas–solid–liquid, three-phase, low-deposition-current composites. The above influence laws and mechanisms lay the foundation for precise control of the microstructure and properties of PS-PVD coating deposition with a low current. Systematic evaluation of the thermal insulation, cycle life, and high-temperature erosion resistance of coatings with different microstructures is one of the key focus areas of future research. Comprehensive regulation of the gas-solid-liquid, three-phase ratio can be used to study the influence of microstructural coatings—such as dendrite crystals, continuous growth, condensed particle content, and columnar crystal density—on the coating properties, as well as further promote the development of technological applications for PS-PVD engineering. |
| Key words: 8YSZ coatings plasma spray-physical vapor deposition (PS PVD) process parameters microstructure microhardness |
