2提高至11.2 A/cm2。改善鎢粉性能,優(yōu)化多孔鎢基體的微觀組織,可大幅度提高鋇鎢陰極的發(fā)射性能。"/>

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等離子體球化處理和放電等離子燒結(jié)制備鋇鎢陰極多孔鎢基體
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合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院

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國(guó)家自然科學(xué)基金資助(51504100)


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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    采用等離子體球化處理和放電等離子燒結(jié)(SPS)相結(jié)合的方法制備了鋇鎢陰極多孔鎢基體。研究了等離子體球化處理工藝參數(shù)對(duì)鎢粉的球化率和性能的影響規(guī)律,以及SPS制備的多孔鎢基體的微觀組織和相應(yīng)鋇鎢陰極的發(fā)射性能。結(jié)果表明：當(dāng)喂粉速率和載氣流量分別為2.4 g/min和4.0 L/min時(shí),可得到球化率大于98%,且表面光滑、球形度高的球形鎢粉；經(jīng)球化處理后,鎢粉的松裝密度和流動(dòng)性顯著提高。與原料鎢粉相比,采用球形鎢粉制備得到的多孔鎢基體的孔隙結(jié)構(gòu)和分布均得到顯著改善,且開孔率由18.3%提高至19.7%；相應(yīng)的鋇鎢陰極在1050 oC下的飽和脈沖發(fā)射電流密度由8.7 A/cm2提高至11.2 A/cm2。改善鎢粉性能,優(yōu)化多孔鎢基體的微觀組織,可大幅度提高鋇鎢陰極的發(fā)射性能。

    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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胡可,邱振濤,楊新宇,張久興.等離子體球化處理和放電等離子燒結(jié)制備鋇鎢陰極多孔鎢基體[J].稀有金屬材料與工程,2019,48(2):608~613.[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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  • 收稿日期:2017-05-26
  • 最后修改日期:2017-07-20
  • 錄用日期:2017-08-18
  • 在線發(fā)布日期: 2019-03-15
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