烧结温度对铜基粉末冶金摩擦材料性能的影响

为了探究烧结温度对铜基粉末冶金摩擦材料性能的影响，通过四种温度(825、850、875、900 ℃)热压烧结，成功制备了铜基粉末冶金摩擦材料。研究了材料的微观组织、密度、硬度、抗压强度、摩擦性能，由此得到材料的较佳烧结温度。结果表明，在四种烧结温度下，材 料中的各元素能均匀地分布在Cu基体中。随着烧结温度的升高，密度、硬度、抗压强度和摩擦因数都先增大后减小，而孔隙率和磨损量先减小后增大。Cr能改善Cu与C之间的湿润性，提高金属基体与非金属组元之间的结合强度，从而使材料的密度增大；Ni、Mn能向Cu中扩散，形成固溶体，阻碍位错运动，提高材料的硬度。铜基粉末冶金摩擦材料较佳烧结温度为850 ℃，此时的密度为6.17 g/cm³，孔隙率为8.62%，维氏硬度为81.2，抗压强度为172.8 MPa，摩擦因数为0.37，磨损量为0.074 g。

Effect of sintering temperature on properties of Cu-based powder metallurgy friction materials

In order to investigate the effect of sintering temperature on the properties of Cu-based powder metallurgy friction materials, Cu-based powder metallurgy friction materials were successfully prepared by hot pressing sintering at four different temperatures (825, 850, 875, 900 °C). The microstructure, density, hardness, compressive strength, and friction properties of the materials were studied to obtain the better sintering temperature of the materials. The results show that the elements in the materials can be evenly distributed in the Cu matrix at four sintering temperatures. With the increase of sintering temperature, the density, hardness, compressive strength and friction coefficient first increase and then decrease, while the porosity and wear amount first decrease and then increase. Cr can improve the wettability between Cu and C, and enhance the bonding strength between metal matrix and non-metallic components, thereby increasing the density of the material. Ni and Mn can diffuse into Cu to form solid solution, hinder dislocation movement and improve the hardness of the material. The better sintering temperature of Cu-based powder metallurgy friction material is 850 °C, At this time, the density is 6.17 g/cm³, the porosity is 8.62%, the Vickers hardness is 81.2, the compressive strength is 172.8 MPa, the friction coefficient is 0.37, and the wear amount is 0.074 g.