Abstract:With Al₂O₃ dispersion-strengthened copper (referred as “ODS copper”) powder prepared by internal oxidation method and atomized tin powder as raw materials, ODS copper-tin alloying powder was synthesized by diffusion alloying method, then pressed and sintered to prepare oil bearings. The effects of the diffusion temperature on the alloying degree of ODS copper-tin and the sintering temperature on performances of the oil bearings were investigated. The results indicate that tin is uniformly distributed in the ODS copper matrix after diffusion alloying at 700℃ for 1h and the as-prepared ODS-tin alloying powder has the apparent density of 2.40 g/cm³ as well as flowability of 39.6 s/(50 g). When the bearing compacts were sintered at temperatures no lower than 800 ℃, no significant metallurgical bonding occurs between the powder particles, which leading to poor performances. When increasing the sintering temperature to 850 ℃, metallurgical bonding is widely observed between powder particles, which remarkably improves the strength and slightly decreases the open porosity of the bearings. Once the sintering temperature exceeds 900 ℃, the bearings shrank significantly combined with sharply reducing of the open porosity. In this research, the ODS copper-tin oil bearings sintered at 850 ℃ have the best comprehensive properties with radial and axial shrinking ratio of about 1.0%, radical crushing strength of 160 MPa, microhardness of 166 HV_0.05 and open porosity of 26.0%.