电极感应气雾化法制备Y2O3增强Ti-6Al-4V复合粉末的性能  

Characterization of Y2O3 reinforced Ti-6Al-4V composite powder prepared by electrode induced gas atomization

作　　者：刘联平 陈仕奇[1] LIU Lianping;CHEN Shiqi(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,长沙410083

出　　处：《粉末冶金材料科学与工程》2020年第6期449-457,共9页Materials Science and Engineering of Powder Metallurgy

摘　　要：采用电极感应气雾化法(electrode induced gas atomization,EIGA)制备Y2O3增强Ti-6Al-4V(TC4合金)复合粉末。测定粉末的流动性和松装密度,并通过光学显微镜和扫描电镜观察Y2O3的形态与分布,利用X射线衍射仪和等离子体发射光谱仪分析Y2O3/TC4复合粉末的物相及元素组成。结果表明,采用EIGA法制备的Y2O3/TC4复合粉末球形度良好,存在少量非球形粉,表面黏附有卫星粉和Y2O3颗粒。复合粉末的流动性较差,为33.9~45.6 s/50 g,受Y2O3的原始粒度影响较大;粉末的松装密度主要受Y2O3含量(w(Y2O3),下同)影响,随Y2O3含量增加而增大。Y2O3均匀分布于TC4基体中,与基体的结合界面光滑、平整,基本保持原有形态和尺寸。Y2O3易团聚,其微观形态主要受原始粒度影响。大尺寸的Y2O3/TC4复合粉末中Y2O3呈环状分布,小尺寸粉末中Y2O3颗粒较少,分布均匀。Y2O3 reinforced Ti-6Al-4V(TC4 alloy)composite powders were prepared by electrode induced gas atomization(EIGA).The flowability and apparent density of the powders were measured.The morphology and distribution of Y2O3 were observed by optical microscope(OM)and scanning election microscope(SEM).The phase and element composition of Y2O3/TC4 composite powders were analyzed using X-ray diffraction(XRD)and plasma emission spectrometer(PES).The results show that the Y2O3/TC4 composite powders prepared by EIGA have good sphericity with a small amount of non-spherical powders.Satellite powders and Y2O3 particles are adhered on the surface.The flowability of the composite powders is poor,ranging from 33.9−45.6 s/50 g,which is greatly affected by Y2O3 original particle size.The apparent density is mainly affected by the Y2O3 content(w(Y2O3)),which increases with the increase of Y2O3 content.Y2O3 particles maintain the original shape and size,which are distributed in TC4 matrix uniformly.The interface with matrix is smooth and flat.Y2O3 particles are easy to agglomerate,and the micromorphology is mainly influenced by the original particle size.Y2O3 with ring distribution are found in large-size composite powders.The Y2O3 content in small-sized composite powders is less,and the distribution is uniform.

关 键 词：电极感应 气雾化 复合粉末 Y2O3 TC4 分布形态 

分 类 号：TG146.23[一般工业技术—材料科学与工程]