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选用4种不同WC尺度的WC-12Co粉末作为初始喂料,通过超音速火焰喷涂系统(HVOF)制备了涂层。考察了不同粉末结构对涂层沉积过程的脱碳行为和涂层组织性能的影响。结果表明:WC颗粒尺寸减小加剧了涂层脱碳行为,涂层中W2C含量增加,粘结相非晶化现象明显,涂层硬度增加,但是当WC颗粒尺寸减小到纳米尺度时,韧性下降。双峰结构涂层表现出最好的韧性同时兼备较高的硬度。
Four WC WC-12Co powders with different WC dimensions were selected as the initial feedstock and coatings were prepared by a supersonic flame spray system (HVOF). The effects of different powder structures on the decarburization behavior and the microstructure and properties of the coatings were investigated. The results show that the decrease of WC particle size aggravates the decarburization of the coating, the content of W2C in the coating increases, the amorphization of the binder phase is obvious and the hardness of the coating increases. However, when the WC particle size decreases to nanoscale, the toughness decline. Bimodal coatings exhibit the highest toughness with high hardness.