Effect of braking pressure on friction of copper-based powder metallurgy brake materials
ZENG Xin1， LI Feng2
1.?Wuhan Vocational College of Software and Engineering， Wuhan 430205， China 2.?College of Mechanical Engineering， Taiyuan University of Technology， Taiyuan 030024， China
Abstract：The tribological properties of copper-based powder metallurgy train brake materials at different brake condition were tested on MM-2000II friction tester. The results show that， the grains have obvious stacking fault stripes when annealed at 900 ℃ for 2 h， which form into a barrier to hinder the dislocation movement and lead to dislocation annihilation difficulty， and make the sub-grain boundaries or grain boundaries increase， grain refinement and materials hardness enhancement. With the increasing of the braking pressure， the friction coefficient increases firstly and then decreases， and has a good stability generally， the wear mass loss increases and turns to be stable gradually.
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2016, Vol. 26 
