Thermionic cathode with a mixed LaB6 and TaC emission layer
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摘要: 研究了一种LaB6与TaC混合涂层热阴极，其发射层通过均匀混合LaB6与TaC粉末得到。比较了该阴极在LaB6与TaC混合比例为1∶1, 2∶1和3∶1下的发射特性，发现混合型LaB6阴极的功函数与多晶LaB6阴极的非常接近，在3∶1的混合比例下，电极的发射电流稳定，得到的电流密度为30 A/cm2。该电极可被应用于需要大电流密度和超大面积阴极的真空电子器件及动态真空电子束设备中。Abstract: A thermionic cathode with a mixed LaB6 and TaC emission layer was investigated. Emission properties of cathodes with LaB6 to TaC weight ratios of 1∶1, 2∶1, and 3∶1 were studied and compared. The work function of the mixed LaB6 cathode was found to be similar to that of polycrystalline LaB6 cathodes. Stable electron emission with a current density of about 30 A/cm2 was achieved with cathode recipe of 3∶1. The cathode can be applied to vacuum electronic devices and dynamic vacuum electron-beam equipments where large electron current density and extremely large area cathodes are demanded.
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Key words:
- LaB6 /
- thermionic cathode /
- work function /
- electron emission
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