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The tungsten powder study of the dispenser cathode

机译:分配器阴极的钨粉研究

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The intercorrelation of tungsten powder properties, such as grain size, distribution and morphology, and porous matrix parameters with electron emission capability and longevity of Ba dispenser cathodes has been investigated for the different grain morphologies. It is shown that a fully cleaning step of the tungsten powder is so necessary that the tungsten powder will be reduction of oxide in hydrogen atmosphere above 700 degrees C. The porosity of the tungsten matrix distributes more even and the closed pore is fewer, the average granule size of the tungsten powder distributes more convergent. The porosity of the tungsten matrix and the evaporation of the activator are bigger and the pulse of the cathode is smaller when the granularity is bigger by the analysis of the electronic microscope and diode experiment. (c) 2005 Elsevier B.V. All rights reserved.
机译:针对不同的晶粒形貌,研究了钨粉性能(例如晶粒大小,分布和形态,以及多孔基质参数)与Ba分配器阴极的电子发射能力和寿命之间的相互关系。结果表明,必须对钨粉进行充分的清洁步骤,以使钨粉能够在高于700摄氏度的氢气氛中被氧化物还原。钨基体的孔隙分布更均匀,闭孔更少,平均钨粉的粒度分布较集中。通过电子显微镜和二极管实验的分析,当粒度较大时,钨基体的孔隙率和活化剂的蒸发量较大,阴极的脉冲较小。 (c)2005 Elsevier B.V.保留所有权利。

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