【摘要】 采用自主研发的机械蓄能式高速压机成形纯钛粉,研究纯钛粉高速压制成形行为及烧结坯的组织和性能。结果表明:经高速压制工艺成形的生坯密度随着冲击能量增加而增加。冲击能量为1805 J时获得的最高压坯密度为4.37 g/cm~3,相对密度达到96.9%。生坯的径向弹性后效随着冲击能量的增加而增加。在1200℃真空烧结后发现,随着冲击能量的增加和烧结时间的延长,烧结密度增加。烧结2.5 h后,获得的最高密度达到4.50 g/cm~3,相对密度为99.8%,最大硬度达到298 HV。当冲击能量为1805J烧结时间为1.5 h时,最高的抗拉强度达到638 MPa。径向烧结收缩率随着冲击能量增加而减少,而轴向烧结收缩率与冲击能量的关系不存在明显的规律。更多还原

【Abstract】 Pure Ti powder compacts were formed by a self-developed high velocity compaction machine,followed by vacuum sintering. The effect of impact energy on density and mechanical properties was investigated. The results show that the green density increases with impact energy,the maximum green density reaches up to 4. 37 g / cm~3( a relative density of 96. 9 %) at an impact energy of 1805 J. The radial spring back effect increases with increasing impact energy. After vacuum sintering at 1200 ℃,the sintered density increases with increasing impact energy and prolonging sintering time. After sintered for 2. 5 h,the sintered density reaches a maximum of 4. 50 g / cm~3( a relative density of 99. 8 %) with a highest hardness of 298 HV. The compacts formed with 1805 J obtain the maximum tensile strength of 638 MPa after sintered for 1. 5 h. With the increase in impact energy,the radial shrinkage decreases,while there is no obvious relationship between the axial shrinkage and impact energy.更多还原