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Research on Electrical Breakdown Characteristics of Ozonized Water Treated Oxygen-free Copper in Vacuum

真空臭氧水处理无氧铜电击穿特性研究

基本信息

批准号：
10555086
负责人：
KOBAYASHI Shinichi
金额：
$ 5.25万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10555086/
关键词：
Ozonized water treatment Eelctrical breakdown in vacuum Conditioning effect Surface condition Oxydized layer 電界電子放出

项目摘要

It has been reported that to obtain higher conditioning effect of a vacuum gap requires in situ pre-cleaning of electrode surfaces. On a practical point of view, however, it is preferable to achieve higher conditioning effect without any in situ pre-cleaning procedure. Recently developed ozonized water treatment has advantages that clean surfaces are ontained and the cleaned surface can be kept even in air. In this project electrical breakdown characteristics of ozonized water treated oxygen-free copper electrodes in vacuum were investigated.From the measurements of the electrodes tereated after 3 days it was found that higher conditioning effect was obtained without any in situ pre-cleaning. The breakdown field (Breakdown voltage/gap length) after conditioning procedure achived about 250 MV/m. This value almost conincide with the value obtained for the electrodes with in situ pre-cleaning. Such higher conditioning effect after ozonized water treatment can be attributed to the advantage that the cleaned surface can be kept even in air, since after the conditioning procedure the oxydized layer created by the ozonized water treatment was completely removed. Surface analysis revealed that oxydized surface was conposed of three layers, that is, thin contaminat layer at the top most of the surface, CuO layer and Cu2O layer. It is useful for tdeveloping electrode surface processing technique that after the ozonized water treatment the surface condition can be characterized. In addition, electrodes exposed to air for 3 months after the ozonized water treatment has an competitive conditioning effect to that of electrodes treated after 3 days.From these results it has been confirmed that ozonized water treatment has a practical advantage that electrodes after machining and the treatment can be stored in air for long time even for 3 months.

据报道，为了获得更高的真空间隙调节效果，需要对电极表面进行原位预清洁。然而，从实用角度来看，最好在不进行任何原位预清洁程序的情况下实现更高的调理效果。最近开发的臭氧水处理的优点是可以保持清洁的表面并且即使在空气中也可以保持清洁的表面。本项目对真空中臭氧水处理的无氧铜电极的电击穿特性进行了研究。对电极处理3天后的测量发现，无需任何原位预清洗即可获得较高的调理效果。调节程序后的击穿场（击穿电压/间隙长度）达到约 250 MV/m。该值与原位预清洗电极获得的值几乎一致。臭氧水处理后如此高的调理效果可归因于清洁表面即使在空气中也能保持的优点，因为在调理程序之后，由臭氧水处理产生的氧化层被完全去除。表面分析表明，氧化表面由三层组成，即表面最顶部的薄污染层、CuO层和Cu2O层。臭氧水处理后的表面状况的表征对于开发电极表面处理技术是有用的。此外，臭氧水处理后暴露在空气中3个月的电极与处理3天后的电极相比，具有竞争性的调理效果。从这些结果证实，臭氧水处理具有实际优点，加工和处理后的电极可以在空气中长期保存，甚至可以保存3个月。