功率参数对超音速等离子制备高铝铜合金涂层组织的影响

以高铝铜合金Cu-14％Al-X粉体为研究材料,采用DH-2080型超音速等离子设备将粒度-150～+280目的合金粉体喷涂到45#钢基体表面制备涂层,研究不同功率参数对制备的涂层组织结构的影响.结果发现:较低的功率不能使粉体完全软化熔流,制备的涂层组织疏松,较高的功率(52.50 kW)能使喷涂粒子获得足够的能量,在撞击工件表面时完全达到熔流状态,各流延扩展的粒子间搭接、混流充分,形成致密的网状结构涂层表面,纵向组织层流结构明显,层流片之间结合紧密.涂层微观缺陷分析表明,致密的涂层大大降低了涂层的微观缺陷.EMPA分析表明,涂层主要发生Al元素的氧化,但整体上能够基本保持材料的原有相结构特征.

Influence of power parameter on coating organization of high-aluminium copper alloy with supersonic plasma spraying

The high-aluminium copper alloy powder with particle size from-150 to +280 meshes was taken as investigation material,the coating was prefabricated on the substrate of 45# steel with supersonic plasma spraying system DH-2080,and the influence of different power parameters on the organization and structure of the coating was investigated.The result indicated that lower power could not make the powders softening completely to become melt flow,so that the coating organization was loose and in contrast,using higher power,for example 52.50 kW,the spray particle could gain enough energy and reach complete melt flow state at the time of impacting the workpiece surface,and the flow expansion particles overlaped and mixed fully.Therefore a coating with dense mesh structure was fomed and its longitudinal organization also exhibited remarkable laminar structure with compact combination between laminar slices.The microscopic defect analysis of the coating showed that the dense coating greatly reduced its microscopic defect.EMPA analysis showed that the oxidation of Al element took place principally in coating.On the whole,nevertheless,the phase-structural characteristics could basically keep in accordance with that of the original material.