Effect of interconnected metal skeletons on the tribological properties of polyurethane elastomers

Abstract

Electrostatic cumulative discharges from the surfaces of polyurethane elastomers are often the primary cause of accidents and disasters, such as equipment failures, fires, and explosions, in industries. In this study, in order to improve the electrostatic protection performance of PU as well as to enhance the wear resistance of the PU matrix, copper foam was embedded in polyurethane to form a copper foam-based polyurethane composite with a three-dimensional connected metal skeleton. The mechanical properties, wear resistance, and antistatic capability of the composite were experimentally investigated. The results indicated that the connected metal skeleton structure forms a good conductive network and reduces the static electricity on the polyurethane composite surface to less than 1/10 of that on polyurethane. Moreover, owing to the mechanical support offered by metal skeletons with pore densities greater than 50 pores per inch, the wear resistance of the polyurethane composite is also enhanced, and consequently, its degree of wear is reduced to ∼1/5 of that of polyurethane under the same conditions.

Failure Analysis of Abnormal Cracking of the Track Circuit Reader Antenna Baffle for High-Speed Trains

“…The results show that the hardness plays an important role in the fracture sensitivity of PUR material, and in a certain hardness range, PUR with higher hardness has higher toughness, wear resistance, and fatigue resistance. Wen et al [ 10 ] found that electrostatic cumulative discharges on the surfaces of PU elastomers could lead to accidents and disasters, such as equipment failures, fires, and explosions, in industries. In order to solve this problem, they adopted the method of embedding copper foam in PU to form a copper foam-based PU composite, which greatly improved the electrostatic protection performance and wear resistance of PU.…”