Abstract

The tribological performance of compacted and noncompacted polydopamine (PDA)+polytetrafluoroethylene (PTFE) nanocomposite coatings on stainless steel (SS) substrates was investigated. The compaction was accomplished using a combination of heat and pressure. The noncompacted PDA + PTFE coating had an average of 11 times longer durability compared to the pure PTFE coatings. The compaction increased the coating durability by 2.6 times while reducing the coefficient of friction (COF). Furthermore, the compaction helped to reduce the porosity of the PDA + PTFE coating by 63 times compared to the noncompacted PDA + PTFE coating. The higher durability and lower COF of the compacted PDA + PTFE coating can be attributed to the reduced coating roughness and porosity, the enhanced adhesion strength to substrates, and the higher load-carrying capacity.

摘要

研究了压实和非压实聚多巴胺 (PDA)+聚四氟乙烯 (PTFE) 纳米复合涂层在不锈钢 (SS) 基材上的摩擦学性能。使用热和压力的组合来完成压实。与纯 PTFE 涂层相比，未压实的 PDA + PTFE 涂层的耐久性平均长 11 倍。压实使涂层耐久性提高了 2.6 倍，同时降低了摩擦系数 (COF)。此外，与未压实的 PDA + PTFE 涂层相比，压实有助于将 PDA + PTFE 涂层的孔隙率降低 63 倍。压实的 PDA + PTFE 涂层具有更高的耐久性和更低的 COF，这可归因于涂层粗糙度和孔隙率的降低、对基材的粘附强度增强以及更高的承载能力。