科研之友
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摘要
The ion implanting method has been used for implanting metallic lanthanum into the surface of molybdenum wires to study the effect of chemical state of lanthanum on the emission properties of the filaments. The chemical reaction of La2O3 and Mo2C can take place during the operating of the La2O3-Mo filament, and the metallic lanthanum layer improves emission capabilities of the La2O3-Mo filament. During filament carbonizing and operating, to control the evaporation rate of lanthanum from the filament surface is very important. On the basis of experimental results, the optimum carbonizing and operating temperatures have been presented. On application of the new technique, the life of this filament has exceeded the minimum life for practical uses.
- 出版日期2003-1-13
- 单位北京工业大学
