利用超音速火焰喷涂技术喷涂4种不同粒径的WC-17Co粉末,评价粉末粒径对涂层机械性能和抗磨粒磨损性能的影响.结果表明,粉末的粒径越小,在超音速焰流作用下获得的速度和温度越高,形成的涂层越致密,颗粒间的粘接强度越高,同时涂层的显微硬度也越高.WC-17Co粉末的粒径越小,获得涂层的孔隙直径越小,颗粒间的粘接缺陷越少,因此涂层的抗磨粒磨损性能越好.但是当WC-17Co粉末的粒径过于微小时,涂层的断裂韧性将受到影响.在本研究的4种粒径分布的WC-17Co粉末中,中间粒径且分布范围集中的粉末制得的涂层兼具良好的机械性能和抗磨粒磨损性能.
High velocity oxy-fuel (HVOF) spray technique has been employed to fabricate WC-17Co coatings.To achieve a high performance of mechanical properties and abrasive wear resistance,four types of WC-17Co powders with different feedstock particle sizes were investigated.The results show that the feedstock powder with finer particle size has higher velocity and temperature during the spraying process,resulting in a denser coating and a stronger splat-splat bonding.The micro-hardness of WC-17Co coating increases with the decreasing of feedstock size.The coating deposited by fimer feedstock powder has superior abrasive wear resistance,due to the smaller porosity and boundary flaws on coating surface.However,coating fracture toughness could be affected by feedstock size if it is too small.Among all those investigated coatings,the one with medium particle size and narrow size distribution exhibits both excellent mechanical properties and wear resistance.
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