微波管柵發(fā)射問題的研究
Study on grid emission of microwave power tubes
-
摘要: 利用離子束輔助沉積技術(shù)在 Mo柵極上鍍上并注入一層 Hf膜,對鍍后的樣品進(jìn)行了形貌、結(jié)構(gòu)、成份、膜厚及 Mo、Hf界面分析。將樣品進(jìn)行電子管模擬柵發(fā)射試驗(yàn),柵極溫度為 650℃,試驗(yàn) 1000h以上基本無柵發(fā)射電流,可以提高柵控管的可靠性和壽命。實(shí)驗(yàn)結(jié)果表明,陰極中的活性物質(zhì)Ba蒸發(fā)到鍍Hf的 Mo柵極表面,Ba,Hf和O2能形成化合物,從而有效抑制柵極發(fā)射電流。
-
關(guān)鍵詞:
- 柵發(fā)射; 離子束輔助沉積; 化合物
Abstract: Hf film is coated on the surface of Mo-grids by vacuum ion beam aided deposition technology. The SEM, XRD and RBS analyses are performed on modified Mo-grids. Life-span tests of this modified Mo-grid are carried out by diode experiment. When the temperature of the modified Mo-grids is kept at 650 ℃, the modified Mo-grids electron emission can not be detected with microammeter after 1000h life-span. The experimental results show that after the grid is contaminated by electron emission substance Ba of the cathode Hf formed compounds restrain effectively electron emission of grid. -
劉學(xué)愨,陰極電子學(xué),北京,科學(xué)出版社,1980,第一章.[2]國外行波管長壽命氧化物陰極概述,四機(jī)部電真空專業(yè)技術(shù)組,第三部分,1975,20.[3]S. Narita, Research on the Work Function of Thermionic Cathode, J. Phys. Soc. Japan., 1954,Part9, 23. ［4］Metals Handbook, Eighth Edition, Metals Park, Ohio, USA, 537.[4]官沖,張濟(jì)忠,廖顯恒,抗電子發(fā)射鉬柵極的性能分析,功能材料,1999,30(3),268-270. -
計(jì)量
- 文章訪問數(shù): 2222
- HTML全文瀏覽量: 108
- PDF下載量: 409
- 被引次數(shù): 0
下載:
