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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Preparation of nanocomposite thoriated
tungsten cathode by swaging technique
WANG Fa-zhan(王发展), ZHUGE Fei(诸葛飞),
ZHANG Hui(张  晖),DING Bing-jun(丁秉钧)

School of Materials Science and Engineering,
Xi′an Jiaotong University, Xi′an 710049, China

Abstract:By using the high energy ball milling method, the nanosized ThO2 powders were obtained. Through mixing powders, sintering and hot swaging processing, a nanocomposite thoriated tungsten cathode was fabricated. The relative density of the nanocomposite material is near 100%. The microstructure of nanocomposite cathode is quite different from that of conventional thoriated tungsten cathode. Most of thoria particles are less than 100nm in diameter, and distribute on t he boundaries of tungsten grains. The nanocomposite cathode shows a much lower arc starting field than that of conventional cathode, which will improve the performance of the cathode significantly.

 

Key words: W-ThO2 cathode; nanosized powders; nanocomposite; swaging

ISSN 1672-7029
CN 43-1423/U

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