摘要
The temperature and density of plasma jets were estimated with a Boltzmann plot and Stark broadening of Ar I(696.54 nm) lines by optical emission spectroscopy(OES) in the process of plasma plastic, and the morphology and microstructure of tungsten(W) powders were investigated by scanning electron microscope(SEM) and x-ray Diffraction(XRD), respectively.The results show that the assumption of local thermodynamic equilibrium(LTE) was invalid at the end of the plasma jets, and earlier than this after the injection of tungsten powder. The temperature and electron density of the plasma jets were up to about T?=?6797 K with Qc?=?50 slpm and ne?=?1.05?×?1016 cm-3 with Qs?=?115 slpm at Z?=?60 mm, respectively, and both dropped rapidly with the injected tungsten powders of 20 μm. After the plasma plastic process,the spherical tungsten powders were prepared and there were some satellite particles on the surface of the spherical products. The tungsten powders were both composed of a single equilibrium α-W phase with a body centered cubic(bbc) crystal structure before and after plasma treatment.
The temperature and density of plasma jets were estimated with a Boltzmann plot and Stark broadening of Ar I（696.54 nm） lines by optical emission spectroscopy（OES） in the process of plasma plastic, and the morphology and microstructure of tungsten（W） powders were investigated by scanning electron microscope（SEM） and x-ray Diffraction（XRD）, respectively.The results show that the assumption of local thermodynamic equilibrium（LTE） was invalid at the end of the plasma jets, and earlier than this after the injection of tungsten powder. The temperature and electron density of the plasma jets were up to about T?=?6797 K with Qc?=?50 slpm and ne?=?1.05?×?1016 cm-3 with Qs?=?115 slpm at Z?=?60 mm, respectively, and both dropped rapidly with the injected tungsten powders of 20 μm. After the plasma plastic process,the spherical tungsten powders were prepared and there were some satellite particles on the surface of the spherical products. The tungsten powders were both composed of a single equilibrium α-W phase with a body centered cubic（bbc） crystal structure before and after plasma treatment.
作者
Lunjiang CHEN
Wenbo CHEN
Chuandong LIU
Honghui TONG
Qing ZHAO
陈伦江;陈文波;刘川东;童洪辉;赵青(University of Electronic Science and Technology of China,Chengdu 610054,People’s Republic of China;Southwestern Institute of Physics,Chengdu 610041,People’s Republic of China;University of South China,Hengyang 421001,People’s Republic of China)
基金
supported by National Natural Science Foundation of China (Nos. 11805058, 11535003)
Sichuan Science and Technology Program (No. 19ZDYF0012)
