Preparation of nanocomposite thoriated tungsten cathode by swaging technique

• 作 者: 王发展\\r\\r\\r\\r\\r\\r\\r\\r\\r\\n 诸葛飞\\r\\r\\r\\r\\r\\r\\r\\r\\r\\n 张晖\\r\\r\\r\\r\\r\\r\\r\\r\\r\\n 丁秉钧
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2002年02期
• 关键词: tungsten cathode

By using the high energy ball milling method, the nanosized ThO 2 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 100?nm in diameter, and distribute on the 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.

By using the high energy ball milling method, the nanosized ThO 2 powders were obtained. The relative density of the nanocomposite material is near 100%. The microstructure of Most of thoria particles are less than 100 nm in diameter, and distribute on the 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.