6T51高频加热电子管用碳化La2O3—Mo阴极的研究

Carbonized La2O3- Mo Cathode for 6T51 High Frequency Tube

摘要:

研究了应用于6T51发射管中的碳化La2O3-Mo阴极的制作工艺及电子发射性能，在碳化钍钨阴极的实践基础上，实现了La2O3-Mo阴极的碳化以及碳化La2O3-Mo阴极6T51管的去气和阴极激活。对比碳化钍钨阴极，分析了碳化La2O3-Mo阴极6T51管的发射能力，认为目前碳化La2O3-Mo阴极研究的发射量最高水平只达到钝钨阴极的下限值，还不具备取代碳化Th-W阴极的条件，由于碳化Th-W阴极6T51管设计时所选取的阴极发射能力富余量相当大，经过严格的去气，老练处理，碳化La2O3-Mo阴极基本上满足6T51测试的要求，但其发射稳定性不好，发射寿命也不容易掌握，论述了La元素消耗或碳化层消耗是两个影响碳化La2O3-Mo阴极发射稳定性的因素。

Abstract:

The manufacture of carbonized La 2 O 3 -Mo cathodes for use in the 6T51tube,and their emission property were stu died.The study was based on current practice in the manufacturing of carbonized ThO 2 -W cathodes.Using similar techniqu es,carbonization of the La 2 O 3 -Mo cathode,evacuation of the carboniz ed La 2 O 3 -Mo cathode 6T51tube,and activatio n of the cathode were carried out.Mea surements taken on the6T51tube showed that the emission ab ility of the carbonized La 2 O 3 -Mo barely attained the lower limit o f clean W,let alone Th-W.Fur-thermore the emission is unstable an d the emission life can not be easily c ontrolled,possibly due to the consu mption of La and /or carbonized layer.