采用机械合金化及氢气氛烧结工艺制备了致密Mo-18%Cu合金;采用粒度分析仪、XRD和SEM等研究了球磨时间对复合粉体粒径、形貌以及烧结温度对烧结体力学性能和断口形貌的影响.结果表明:随着球磨时间的延长,粉体颗粒尺寸不断减小,形貌与相组成合理,球磨60 h效果最好;球磨60 h的混合粉体烧结时,随着烧结温度升高,烧结体密度与力学性能先升后降,在1 350℃烧结2 h性能最好,相对密度达到98.6%,抗弯强度达到581 MPa,硬度达到64 HRC.

The compact Mo-18%Cu alloy was prepared by mechanical alloying and H2 atmosphere sintering.The effect of milling time on particle size and morphology of the compound powders and sintering temperature on mechanical properties and fracture morphology of the sintering body were investigated by means of particle size analyzer,XRD and SEM.The results show that the particle size of the powders decreased with the prolongation of milling time,while the morphology and the phase composition were reasonable.The best milling effect could be obtained after milled for 60 h.The density and mechanical properties of the sintering body,prepared with the mixed powders milled for 60 h, increased first and then decreased with the increase of the sintering temperature.The best properties could be obtained after sintered at 1 350℃ for 2 h,that the relative density,bending strength and hardness of the sintering body were 98.6%,581 MPa and 64 HRC,respectively.