混粉工艺对纳米Al2O3弥散强化铜基复合材料摩擦学特性的影响

以纳米A l2O3为增强相,用粉末冶金法制备了弥散强化铜基复合材料,研究了混粉工艺对复合材料滑动摩擦学特性的影响。结果表明:添加纳米A l2O3的复合材料其摩擦因数均有不同程度的减小,但以纳米A l2O3质量分数为5%及采用表面活性剂对粉体处理后得到的复合材料的摩擦学性能最好,平均摩擦因数下降近50%,平均磨痕深度下降了40%。对纳米粉体进行分散,可有效解决纳米粉体的软团聚现象,继而得到组织均匀的弥散强化铜基复合材料,特别是在较大复合量的情况下,采用表面活性剂是获得良好摩擦学性能的必由之路。

Study on the Tribology Characteristics of Nano-Al2O3 Reinforced Copper Based Composite

Using nano-Al_2O_3 as reinforced phase,dispersing strengthening copper based composite materials was fabricated by powder metallurgy method.Effects of mixed processing on the tribology characteristics were studied.Results show that the friction coefficient is reduced when nano-Al_2O_3 powder was added in the copper matrix.The copper matrix containing 5% nano-Al_2O_3 and treated with surfactant shows the best properties,for which the average friction coefficient decreases almost 50% and worn depth reduces about 40%.Dispersing the nano-powder resolves the soft reuniting problem effectively,and the uniform structure and dispersing strengthening copper based composite materials is obtained.Treated with surfactant is the better way to obtain good tribology properties,especially under the condition of high Al_2O_3 content.