Influence of Porosity of Paper-based Friction Materials on Compressure-resilience and Tribology Properties

Influence of porosity on the compression-resilience and tribology properties of a hybrid fiber reinforced paper-based friction material that consist of same composition and different porosity were investigated. The results show that when the porosity of sample was higher, compressure rate was higher and resilience rate was lower, however resilient rate of sample with higher porosity were increased notably when pressure was increased, and it tended to accord with of sample with lower porosity. The friction coefficient was higher when porosity of paper-based friction material was higher, and the friction coefficient tended to reduce and stabilize when braking pressure was increased. The friction coefficient of sample with high porosity tended to reduce and stabilize in continuous braking cycles. This is because the pore wall of paper-based material with high porosity collapsed in the condition of higher pressure and continuous braking cycles, which caused change of compression-resilience and tribology properties.