微纳米陶瓷粉末对粒子行为及复合涂层性能的影响

Effect of nanostructured ceramic powder on particles characteristics and coatings properties

关键词:  电弧喷涂  微纳米陶瓷  金属陶瓷复合涂层  粒子特性  涂层性能

Key words:  arc spraying  micron/nanostructured ceramic  ceramic composite coating  partides characteristics  properties of coatings

摘要:

将微纳米材料应用于热喷涂制备高耐磨、耐蚀的涂层是近年来的研究热点。作者测量了微纳米陶瓷粉末对电弧喷涂中飞行粒子熔化程度、飞行速度及雾化粒子尺寸的影响,观察了喷涂铁基TiB₂/Cr₃C₂/Al₂O₃粒子的变形过程,分析微纳米陶瓷粉末对粒子行为的影响规律,并对涂层性能进行了测试,发现微纳米粒子增加了金属陶瓷复合涂层的结合强度,改善涂层的韧性,对涂层的耐磨粒磨损性能影响不大,但明显提高涂层的耐冲蚀性能。最后对微纳米陶瓷粉末在喷涂过程中的作用、对粒子行为及涂层性能的影响机理进行了探讨。

Abstract:

It has already been got attention that excellent wear resistance and corrosion resistance nanostructured coatings can be prepared by thermal spraying nanostructured powders. The velocity, temperature and size of particles of arc spraying different contents micron/nanostructured powder were measured by spraying watch and scan electron microscope. And the deformation of different particles was observed by optical microscope and 3D surface profile, the effect of micron-and nanostructured powder on the flight characteristics and deformation of the particles was analyzed. Mechanical properties of coating were tested. The results show that micron/nanostructured powder can improve bonding strength and toughness of the coating, and non-direct relationships exist between the powder size and the particle wearing resistance of coating, however, the erosion resistance of the coatings intensively depends on the powders size. The influence mechanism of micro/nanosturctured powder on the particles characteristics and coating proerties were investigated.