丝电爆法制备球形W-25%Re合金粉末的组织和性能研究  

Microstructures and Properties of Spherical W-25%Re Alloy Powders Produced by Wire Electrical Explosion Method

作　　者：张莹莹 王学兵[2] 熊宁[2] 柳学全 赵虹淳 Zhang Yingying;Wang Xuebing;Xiong Ning;Liu Xuequan;Zhao Hongchun(Central Iron&Steel Research Institute Company Limited,Beijing 100081,China;Advanced Technology&Materials Co.,Ltd.,Beijing 100081,China)

机构地区：[1]钢铁研究总院有限公司,北京100081 [2]安泰科技股份有限公司,北京100081

出　　处：《稀有金属》2024年第10期1367-1377,共11页Chinese Journal of Rare Metals

基　　金：国家重点研发计划项目(2022YFB3705400)资助。

摘　　要：丝电爆法常用于金属纳米粉的制备,以直径为0.3 mm的W-25%Re(质量分数)合金丝为原料,采用丝电爆法制备微米级球形W-25%Re合金粉末,对获得的粉末进行组织和性能表征。结果表明:丝电爆法制备的粒径5~35,35~60,60~165和>165μm球形W-25%Re合金粉末球形度高,球化率几乎可达100%。粒径为5~35,35~60和60~165μm球形W-25%Re合金粉末的流动性良好,松装密度和振实密度较高。粒径<5μm球形W-25%Re合金粉末的物相为四方晶系W0.4Re0.6相、立方晶系W_(0.8)Re_(0.2)和W_(3)Re相,粒径为5~35,35~60,60~165和>165μm球形W-25%Re合金粉末物相均为立方晶系W_(13)Re_(7)相。W-25%Re合金粉末粒径从8.945μm增大到217.98μm,粉末颗粒表面组织从无明显晶态、胞状晶逐渐转变为树枝晶,粉末粒径d与二次枝晶间距λ的关系为:λ=0.727+5.59×10^(-3)d。球形W-25%Re合金粉末颗粒内部较为密实,无明显孔洞缺陷。丝电爆法制备的微米级球形W-25%Re合金粉末综合性能良好,其中粒径5~35μm球形W-25%Re合金粉末球形度好、粒度分布集中、氧含量低、流动性好、松装密度和振实密度高,可以很好地满足选区激光熔化(SLM)技术对粉末性能的要求。Wire electric explosion method involves introducing a large pulse current into metal wire to create an electric explosion process,resulting in the production of metal powders.This method is commonly used to produce nano-scale spherical powders and offers advantages such as small size,low energy consumption,and high performance of the resulting spherical metal powders.This study utilized W-25%Re(mass fraction,the same below)alloy wire with a diameter of 0.3 mm as the raw material and employed the wire electric explosion method to produce micron-sized spherical W-25%Re alloy powders.The findings offered valuable insights for the efficient production of high-quality micron-sized spherical refractory alloy powder for selective laser melting(SLM)applications.The spherical W-25%Re alloy powder prepared in the experiment was categorized into five kinds particle size ranges:<5,5~35,35~60,60~165 and>165μm.These particle sizes were chosen for analysis to investigate the microstructures and properties of spherical W-25%Re alloy powders.The powders morphology,laser particle size,flowability,apparent density,tap density,oxygen content and phase were measured using scanning electron microscope,laser particle size analyzer,flowability and apparent density tester,multi-functional powder physical property tester,oxygen and nitrogen analyzer,and X-ray diffraction(XRD).The particle size 5~35,35~60,60~165 and>165μm exhibited excellent sphericity,a high spheroidization rate.The particle size<5μm featured small particle size and large specific surface area,leading to strong van der Waals forces among particles and potential agglomeration.Additionally,the particle size 5~35,35~60,60~165 and>165μm demonstrated nearly 100%spheroidization rate.Except for the powder with particle size<5μm,which had a wide distribution range due to severe agglomeration,the particle size distribution of the other four powders were narrow and relatively concentrated.The powders with a particle size of<5μm were smaller and more active.The oxygen content

关 键 词：丝电爆法 球形W-25%Re合金粉末 二次枝晶间距 选区激光熔化(SLM) 

分 类 号：TG456.3[金属学及工艺—焊接]