激光重熔火焰喷涂PEEK涂层微观组织及力学性能研究

Microstructure and Mechanical Properties of Flame-Sprayed PEEK Coating Remelted by Laser Process

聚醚醚酮(PEEK)是一种高性能塑料,它卓越的性能使其在工业设施上的应用日益增多。本文中使用了火焰喷涂设备在304L不锈钢基材上沉积PEEK涂层,随后对喷涂的聚合物涂层进行CO2及Nd:YAG激光处理,使得涂层重熔从而变得更加致密。文中使用了SEM和XRD检测手段来表征喷涂涂层和重熔后涂层,结果表明CO2及Nd:YAG激光处理均适用于不锈钢基材表面PEEK涂层的致密化。然而,不同的激光加工参数所处理的涂层,重熔后具有不同的晶体结构。通过硬度测试、摩擦实验和划痕实验得到了重熔后涂层的力学性能特征,涂层的力学性能与其结构相关。

Poly-ether-ether-ketone （PEEK） is one of high-performance thermoplastics. It is being increasingly used for many industrial applications due to its excellent properties. In this paper, a flame spraying technique was used to deposit PEEK coating on 304L stainless substrates. CO2 and Nd：YAG laser treatments were chosen to remelt the as-sprayed polymer coating to get a dense coating. The microstructures of the as sprayed and remelted coatings were characterized by SEM and XRD. The results show that both CO2 and Nd：YAG lasers are suitable for densifying the PEEK coating on stainless substrate. However, the remelted coatings present different crystalline structure due to their laser processing parameters. Hardness measurements, tribological and scratch tests were conducted characterize the mechanical properties of remelted coating. The coatings’ mechanical properties were correlated with their structures.