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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。
Four kinds of WC-17Co powders with different grain sizes were sprayed by supersonic flame spraying technology to evaluate the influence of powder size on the mechanical properties and wear resistance of the coatings. The results show that the smaller the particle size of the powder, the higher the velocity and temperature obtained under the supersonic flame flow, the more dense the coating is and the higher the adhesion strength between the particles is and the more the microhardness of the coating is high. The smaller the particle size of the WC-17Co powder, the smaller the pore diameter of the obtained coating, and the smaller the adhesion defects between the particles, the better the abrasive wear resistance of the coating is. However, when the grain size of WC-17Co powder is too small, the fracture toughness of the coating will be affected. Among the four particle size distribution WC-17Co powders studied in the present study, the coatings with the intermediate particle size and the concentrated distribution range have both good mechanical properties and abrasive wear resistance.