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采用等离子喷焊技术在不同基体上制备耐磨高铝青铜喷焊涂层,研究喷焊层与基体之间元素扩散对喷焊层组织的影响,并在室温条件下采用销-盘式摩擦磨损试验机考察喷焊层的摩擦磨损性能,进而分析喷焊层的磨损机理.结果表明:三种基体喷焊层在干摩擦条件下摩擦磨损机理存在明显差异,45钢基体喷焊层中团聚状k相易与对摩件发生黏着,脱落成为磨粒,导致严重的磨粒磨损,摩擦系数大;ZQAl9-4铝青铜基体喷焊层中脆性共晶组织(α+γ2)呈网状分布,断裂韧性对材料的磨损起支配作用,主要磨损机制为疲劳磨损与磨粒磨损;T3紫铜基体喷焊层中k相呈细小梅花状,均匀分布在固溶度较大的β’相中,涂层抵抗弹性变形能力提高,疲劳磨损机制得到抑制,摩擦系数小.
The plasma spray welding technology was used to prepare wear-resisting high-aluminum bronze spray coating on different substrates. The influence of element diffusion between spray coating and matrix on the structure of spray coating was studied. The pin-disk friction and wear The friction and wear properties of the sprayed coating were investigated by the testing machine, and the wear mechanism of the sprayed coating was analyzed.The results showed that the friction and wear mechanisms of the three coatings were obviously different under the dry friction condition, k phase easily with the friction pieces of adhesive, off into abrasive particles, resulting in severe abrasive wear, friction coefficient; ZQAl9-4 aluminum bronze matrix spray brittle eutectic (α + γ2) were reticular distribution, Fracture toughness plays a dominant role in the wear of the material, the main wear mechanism fatigue wear and abrasive wear; k3 copper matrix spray coating was small plum-shaped, uniformly distributed in the solid phase β ’phase larger, coated Layer resistance to elastic deformation increased, fatigue wear mechanism is suppressed, the friction coefficient is small.