不同制备工艺参数对PS-PVD-8YSZ涂层微结构及性能的影响  

Effect of Different Thermal Spray Process Parameters on the Microstructure and Properties of PS-PVD 8YSZ Coatings

作　　者：何箐[1,2] 由晓明[1,2] 邹晗 张雨生[1,2] 姜在龙 张云杰 HE Qing;YOU Xiaoming;ZOU Han;ZHANG Yusheng;JIANG Zailong;ZHANG Yunjie(Chinese Academy of Agricultural Mechanization Science Group Co.,Ltd.,Beijing 100083,China;Beijing Jinlunkuntian Special Machine Co.Ltd.,Beijing 100083,China)

机构地区：[1]中国农业机械化科学研究院集团有限公司,北京100083 [2]北京金轮坤天特种机械有限公司,北京100083

出　　处：《中国表面工程》2024年第4期192-205,共14页China Surface Engineering

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。Plasma spray-physical vapor deposition(PSPVD)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 PSPVD 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 PSPVD 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 1-20μm-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 reduci

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 

分 类 号：TQ174[化学工程—陶瓷工业]