无坩埚熔炼气雾化技术制备Ti6Al4V粉末（英文）  

Preparation of Ti6Al4V Powder with High Yield of Fine Particle by Crucible-less Gas Atomization Technology

作　　者：宰雄飞 陈仕奇[1] 刘咏[1] 李瑞迪[1] 吴宏[1] Zai Xiongfei;Chen Shiqi;Liu Yong;Li Ruidi;Wu Hong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《稀有金属材料与工程》2019年第5期1461-1466,共6页Rare Metal Materials and Engineering

摘　　要：采用自主研发设计的无坩埚熔炼气雾化设备制备适用于金属增材制造的球形Ti6Al4V粉末。通过调节进料速度与雾化压力,45μm以下的粉末收得率可达35%(质量分数),高于旋转电极制粉的收得率(~10%)通过扫描电子显微镜(SEM)、X射线衍射(XRD)和金相显微镜(OM)表征粉末显微结构与组织。结果表明制备的Ti6A14V粉末具有良好的球形度和表面光滑,良好的流动性和较高的松装密度使其可用于金属增材制造与注射成型等。由于雾化过程中粉末的冷却速度为10^4~10^8K/s,粉末中的刀相在冷却过程中转变为针状α’相。This study aims at producing sphere Ti6A14V powders with tailed physical characteristics for additive manufacturing application. Ti6A14V powders were prepared by a novel electrode induction guiding gas atomization(EIGA)equipment designed independently. The yielding rate of fine powders could be improved by reasonably increasing feed rate and atomization gas pressure. Interestingly, the yield(35%) of powder particles below 45 μm by EIGA is significantly higher than the yield(~10%) by conventional plasma rotating electrode technology. The powder properties and microstructure were characterized by scanning electron microscope(SEM), X ray diffraction(XRD) and optical microscope(OM). The powders exhibited satisfactory flowability and high apparent density for good sphericity and smooth surface.The powders with tailed size ranges could be used for various additive manufacturing methods and injection moulding etc.The fi phase of Ti6A14V translates to needle-like α’ phase during atomization process because of the fast cooling rate calculated to be 10~4~10~8 K/s.

关 键 词：Ti6Al4V粉末 气雾化 显微结构 增材制造 冷却速度 

分 类 号：TF123.23[冶金工程—粉末冶金]