Initial study on the compositional and phase change of BaO/C/Mo under high temperature

Yuehui Lu; Xuemei Wu; Lanjian Zhuge; Xianghuai Liu

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Initial study on the compositional and phase change of BaO/C/Mo under high temperature

机译：高温下BaO / C / Mo的组成和相变的初步研究

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In pulsed-controlled grid traveling wave tubes, electrons are emitted from the Mo grid heated by the hot cathode and contaminated by the evaporation material (i.e. BaO or Ba) from the cathode, which may cause the tubes to be unavailable. Some studies show that carbon film coated on a Mo grid can effectively suppress the grid emission. The reasons for it, however, have not been well understood. To study the effect of carbon film on the Mo grid contaminated with BaO or Ba under high temperature, carbon films were prepared on the Mo substrates at room temperature by dual ion beam sputtering deposition system and post-annealing was conducted to know their status under high temperature, and BaO layer was coated on the Mo and carbon-coated Mo substrates by the chemical method in, our experiments. The compositional and phase change of BaO/C/Mo is investigated at two different temperatures of 973 and 1223 K. The results show that the BaO/C/Mo system changes into the C/Mo after the exhaustion of BaO in the case of 1223 K owing to the reaction of carbon with BaO, however, the BaO/C/Mo is almost invariable at 973 K. The mechanism that the addition of carbon film can effectively suppress the grid emission under its working conditions is discussed according to the experimental results and the calculation of the reaction free energy.

机译：在脉冲控制的栅行波管中，电子从被热阴极加热的Mo栅中发射出并被来自阴极的蒸发材料（即BaO或Ba）污染，这可能导致电子管无法使用。一些研究表明，涂在Mo网格上的碳膜可以有效地抑制网格发射。然而，其原因尚未被很好地理解。为了研究碳膜对高温下被BaO或Ba污染的Mo晶格的影响，采用双离子束溅射沉积系统在室温下在Mo衬底上制备了碳膜，并进行了后退火处理以了解其在高温下的状态。在我们的实验中，通过化学方法将BaO层涂覆在Mo和碳涂覆的Mo衬底上。研究了在973和1223 K这两个不同温度下BaO / C / Mo的组成和相变。结果表明，在1223的情况下，BaO耗尽后BaO / C / Mo系统变为C / Mo。由于碳与BaO的反应，BaO / C / Mo在973 K时几乎不变。根据实验结果讨论了添加碳膜可有效抑制其工作条件下的网格发射的机理。以及反应自由能的计算

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来源
《Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms》 |2004年第4期|p.555-560|共6页
作者
Yuehui Lu; Xuemei Wu; Lanjian Zhuge; Xianghuai Liu;
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作者单位

Department of Physics, Suzhou University, 1 Shizhi street, Suzhou 215006, China;

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正文语种 eng
中图分类原子核物理学、高能物理学;原子能技术;
关键词
BaO; carbon film; mo grid; dual ion beam sputtering; traveling wave tube; grid emission;

机译：BaO;碳膜;mo栅;双离子束溅射;行波管;栅网发射;

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Initial study on the compositional and phase change of BaO/C/Mo under high temperature

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