Experimental research of thermal processing phenomena by micro-arc

微弧热处理现象的实验研究

• 批准号: 10450271
• 负责人: HIRATA Yoshinori
• 金额: $ 5.89万
• 依托单位: Osaka 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 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10450271/
• 关键词: Micro-Arc; Electrical breakdown; Micro materials processing; Very small size welding; Tungsten cathode; Melting and evaporation process; グロー放電; 微細加工; アーク溶棲; 溶融・蒸発現象; アーク溶接

The phenomena associated with micro-arc, which is struck in argon gas atmosphere in the gap between thin tungsten cathode and stainless steel plate anode, were experimentally investigated. The experimental setup, which is consisted of a micro-arc torch, precise positioning mechanisms actuated by piezoelectric devices and pulse motors, and a power supply for discharge, was constructed. Time-resolution of micro-discharge appearance was observed through microscope with high-speed shutter CCD camera. The results obtained are summarized as follows :(1) Electrical breakdown voltage increases with increase of gap length beyond about 10μm. In the range of small gap length of a few micrometer, it requires almost constant voltage of 250-300 V independently of gap length. High intense luminous region of micro-arc is concentrated at the electrode tip in the early stage of the discharge and then expands with time.(2) The size and/or the form of melting spot at anode surface by micro-arc depend mainly on gap length. Melting spot with flat surface having diameter of 5-10μm can be obtained by adjusting gap length, current level and pulse width.

对在氩气气氛中薄钨阴极和不锈钢板阳极之间的间隙中产生的微弧现象进行了实验研究。该实验装置由微弧炬和驱动的精确定位机构组成。构建了由压电器件和脉冲电机组成的放电电源，并通过高速快门CCD相机的显微镜观察了微放电现象的时间分辨率，所得结果总结如下。 ：(1) 电气击穿电压随着间隙长度的增加而增加，超过约10μm时，在几微米的小间隙长度范围内，无论间隙长度如何，都需要250-300V的几乎恒定的电压。 -电弧在放电初期集中在电极尖端，然后随着时间的推移而扩展。(2)微电弧在阳极表面形成的熔点的大小和/或形式主要取决于间隙长度。通过调节间隙长度、电流大小和脉冲宽度可以获得直径为5-10μm的平坦表面。

项目成果

Hirata Y.: "Micro-Arc Discharge Phenomena"Vacuum. Vol.53(予定). (2000)

Hirata Y.：“微弧放电现象”真空。第 53 卷（计划）（2000 年）。