Influence of Ni Particle Size on Friction and Wear Properties of Cu-based Powder Met-allurgy Materials
Cu-based friction materials with different particle sizes of Ni powders(425 μm,150 μm,75 μm,38 μm)were fabricated by powder metallurgy.The microstructure,density,hardness,porosity,friction and wear properties of materials were investigated.The results indicate that the Ni particles with small size can increase the contact area with Cu matrix,enhancing the solid solution strengthening effect during sintering.The smaller the size of Ni particles,the better the sintering effect,and the higher hardness enhancement.With the particle size of Ni reducing from 425 μm to 38 μm,the density of material is increased by 0.37 g/cm3,the porosity is reduced to 5.3%,and the hardness is increased by 7.96 HB.However,the friction coefficient curve reaches the maximum value at 75 μm,where the wear amount is the minimum value.With the further reducion of particle size,the friction coefficient is decreased since clamping force of materials to hard particle becomes stronger.During the braking process,the shedding of hard particle become difficult due to the excessive hardness during the friction process,reducing the friction coefficient.
Cu-based Powder MetallurgyFriction MaterialNi Particle SizeFriction and Wear
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