Review of solid lubrication technologies for friction pendulum system
Li Xiangjie1 Pan Peng2 Cao Yingri1
1. School of Civil Engineering, Tsinghua University, Beijing100084, China;2. Key Laboratory of Civil Engineering
Safety and Durability of the Ministry of Education, Tsinghua University, Beijing100084, China
Abstract：Friction pendulum system (FPS) or friction pendulum bearing (FPB), has attracted wide attention owing to its unique properties, including the isolation period unrelated to superstructure mass and the re-centering capability. In its practical applications, however, consistent and low friction solid lubricant layer of ensuring stable friction surface is still a crucial challenge for FPS. The commercialized FPS products in the US have adopted aerospace-based bearing materials for sliding interface, but these bearing materials have not been thoroughly studied in China. As the FPS research in China is still at the starting stage and systematic review on the topics of solid lubricants is absent, the contact and transfer mechanisms of solid lubricants at the sliding frictional interface are introduced. The solid lubricant materials are summarized into three major categories: metal and metallic oxides, transition metal disulphide and engineering plastics. Furthermore, the advantages and disadvantages of these materials are discussed. The testing methods on friction coefficient are summarized, and the influences of velocity, pressure, temperature, surface roughness and other parameters on test results are discussed. The ideal working limits of the solid lubricant layer are compared to those in the Chinese standards. Finally, the suggestions on future research directions and research contents of the solid lubrication technologies are proposed.
