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Porous Tungsten Matrix for Ba-W cathode Prepared by Plasma Spheroidization Process and Spark Plasma Sintering
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School of Materials Science and Engineering,Hefei University of Technology

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    Abstract:

    Porous tungsten matrix for Ba-W cathode was prepared by plasma spheroidization process combined with spark plasma sintering (SPS). The effect of plasma spheroidization process parameters on the spheroidization efficiency and properties of the W powders, microstructure of the porous W matrix sintered by SPS as well as the emission performance of the corresponding Ba-W cathode were investigated. The results show that spherical W powders with smooth surfaces and good sphericity can be obtained when the powder feed rate and carrier gas flow rate is 2.4 g/min and 4.0 L/min, respectively. The spheroidization efficiency is above 98%. The apparent density and flowability of the spherical W powders are enhanced greatly after plasma spheroidization. In contrast to the raw W powders, the structure and distribution of pores within the porous W matrix prepared by the spherical W powders are improved significantly after SPS, and the open porosity increases from 18.3% to 19.7%. The saturation pulse current density of the Ba-W cathode prepared with spherical W powders is 11.2 A/cm2, which is higher than that of 8.7 A/cm2 for the Ba-W cathode prepared by the raw W powders. The emission performance of Ba-W cathode can be highly improved by modifying the properties of W powders and microstructure of the porous W matrix.

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[Hu Ke, Qiu Zhentao, Yang Xinyu, Zhang Jiuxing. Porous Tungsten Matrix for Ba-W cathode Prepared by Plasma Spheroidization Process and Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2019,48(2):608~613.]
DOI:10.12442/j. issn.1002-185X.20170448

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History
  • Received:May 26,2017
  • Revised:July 20,2017
  • Adopted:August 18,2017
  • Online: March 15,2019
  • Published: