一种用于热阴极的高可靠热子  

Novel Type of Highly Reliable Electric Heater for Thermal Cathode of Microwave Vacuum Electron Device

作　　者：刘燕文[1] 孟鸣凤[1] 朱虹[1] 邯娇[1] 扬丹[1] 谷兵[1] 陆玉新[1] 方荣[1] 

机构地区：[1]中国科学院电子学研究所,100190

出　　处：《真空科学与技术学报》2015年第1期79-83,共5页Chinese Journal of Vacuum Science and Technology

基　　金：国家自然科学基金项目(批准号:61072025);国家863计划资助的(合同号:2013AA8035040C)

摘　　要：微波真空电子器件广泛应用于雷达、卫星通信、电子加速器等方面,热子又是微波真空电子器件中最为核心的部件之一,其性能好坏将直接影响微波源的可靠性和寿命。为了克服传统热子制备工艺的缺点,避免螺旋腿部分的钨或钨合金丝出现损伤,提供一种高可靠热子制备方法,采用高温焊料焊接技术将螺旋丝与插腿焊接在一起,从而制备出具有螺旋腿与插腿之间接触电阻小、耐震动性能好、抗热冲击性能好和可靠性高等优点的热阴极用热子。采用新方法制备的热子在1100℃高温下寿命已超过3000 h,没有出现断路现象,目前在各种微波管上使用了新方法制备的热子,没有出现一只断路。A novel type of electric heater, widely used in the thermal cathode of a variety of microwave vacuum elec- tron devices, was developed. In the newly-developed heater, the tungsten or tungstenrheniumalloy（W-Re） spiral filament was welded onto the insert-legs with high temperature solder. In contrast, in a conventional heater, the filament ends were spiral-wrapped the insert-legs;and its weaknesses, including the loose contact; small contact area, and filament with frac- tures, often resulted in low vibration and thermal shock resistances, poor reliability, and short lifetime. The new heater pro- vides a total solution to the problems of the conventional one. Tested at 1100℃, the new heater had a lifetime over 3000 h because of its many advantages over the old one, such as lower contact resistance, higher vibration and thermal shock re- sistances, and better reliability. So far, no one has been found broken, among all the prototyped heaters installed in a series of microwave vacuum electron devices.

关 键 词：微波真空电子器件 热阴极 热子 焊接 焊料 

分 类 号：TN103[电子电信—物理电子学]