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电子轰击加热的六硼化镧阴极实验测量
发表时间：2011-02-15 浏览量：1778 下载量：559
| 全部作者： | 王秩雄，张正齐，陈绳乾，黄建仁 |
| 作者单位： | 空军工程大学电讯工程学院 |
| 摘 要： | 研制出一种电子轰击加热的六硼化镧（LaB6）阴极。49.2 W的轰击功率就能把Φ 5.00 mm×1.00 mm LaB6圆片加热到1 559℃，轰击加热功率密度为251 W/cm2，LaB6中心与边缘的温差在10℃以内。1 551℃时测得发射的电流密度为3.5 A/cm2. 长的阴极寿命要求气压低于1.6×10-4 Pa. 电子束轰击热解石墨，无LaB6蒸镀钨丝现象，轰击功率稳定。在多次热冲击下，LaB6没有碎裂。该阴极可拆卸、长寿命，可用于大功率微波管。随着温度的升高，实验中观测到LaB6发射面变灰，而且这种变化是可逆的。 |
| 关 键 词： | 物理电子学；电子轰击加热LaB6阴极；LaB6电子枪；热解石墨加工 |
| Title： | Experiment measurement of electron bombardment heating lanthanum hexaboride cathode |
| Author： | WANG Zhixiong, ZHANG Zhengqi, CHEN Shengqian, HUANG Jianren |
| Organization： | Telecommunication Engineering Institute, Air Force Engineering University |
| Abstract： | A electron bombardment heating method capable of heating LaB6 cathode to 1 559℃ has been developed. A LaB6 disk of size Φ 5.00 mm×1.00 mm has been heated to 1 559℃, with 49.2 W and 251 W/cm2 of bombardment heating power. The temperature difference between center and edge is less than 10℃. At 1 551℃emissive current density is 3.5 A/cm2. 1.6×10-4 Pa even lower air pressure is requested for a long life of the cathode. The electron beam bombards pyrolytic graphite clamper, no tungsten filament is coated by evaporated LaB6 and as a result bombarding power is stable. LaB6 did not crack under repeated heat strike. The cathode is dismountable, longevity and can be applied to powerful microwave tube. A phenomenon that the LaB6 surface color becomes grey has been observed in the experiment as the temperature rises, and this change is reversible. |
| Key words： | physics electronics; electron bombardment heating LaB6 cathode; LaB6 electron gun; pyrolytic graphite machining |
| 发表期数： | 2011年2月第3期 |
| 引用格式： | 王秩雄，张正齐，陈绳乾，等. 电子轰击加热的六硼化镧阴极实验测量[J]. 中国科技论文在线精品论文，2011，4（3）：183-189. |
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