Study on intelligent properties of arc cathode spot and their applications to surface cleaning of metals

电弧阴极点智能特性研究及其在金属表面清洗中的应用

• 批准号: 14350390
• 负责人: TAKEDA Koichi
• 金额: $ 8.96万
• 依托单位: Akita Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14350390/
• 关键词: arc; cathode spot; vacuum; work function; oxide removal; surface roughness; 雰囲気圧力; 電極間距離; クリーニング

Cathode spots of a vacuum arc are preferably produced on the metallic oxide. They remove the oxide selectively by evaporation and clean the metal surface. In this work investigators have studied the characteristic features of the cathode spots and understand physical background of the unique properties. Main results are summarized below.(1)The analysis of surface using a Kelvin probe reveals that the preferable formation of cathode spots on the metallic oxide results from the lower work function of the oxide compared with pure metal.(2)There exist two different modes of cathode spots produced on the metallic oxide. One has higher energy density than the other. The cathode spots with higher energy density contribute the high rate of oxide removal. The surface treated by high energy cathode spots becomes smoother than that by low energy cathode spots.(3)Two different modes can appear on the same surface at the same time. The ratio of high energy spots to low energy ones depends on the surface condition. The application of NaOH or KOH to the cathode surface of the metal results in the increase of the ratio, which means the increase of the rate oxide removal. The addition of polyethylene glycol also contributes the increase of the removal rate.(4)The hardness of the surface treated by the cathode spots increases because of the rapid solidification of the thin molten layer formed during the removal of oxide.(5)Reduction of gap width between an anode and a cathode results in the increase of the energy efficiency of the oxide removal. The anode potential drop disappears in a gap width shorter than a critical value. In such condition, a major part of the input energy is consumed for the removal of oxide on the cathode.

优选在金属氧化物上产生真空电弧的阴极斑点。它们通过蒸发选择性地去除氧化物并清洁金属表面。在这项工作中，研究人员研究了阴极斑点的特征，并了解独特性质的物理背景。主要结果总结如下。（1）Kelvin探针表面分析表明，金属氧化物的功函数比纯金属的功函数低，因此在金属氧化物上形成阴极斑点的效果较好。（2）在金属氧化物上产生的阴极斑有两种不同的模式。一个比另一个具有更高的能量密度。具有较高能量密度的阴极斑点有助于高的氧化物去除速率。高能阴极斑处理的表面比低能阴极斑处理的表面光滑。（3）两种不同的模式可以同时出现在同一表面上。高能点与低能点的比例取决于表面条件。在阴极表面添加氢氧化钠或氢氧化钾可提高氧化物的去除率。聚乙二醇的加入也有助于提高去除率。（4）阴极斑点处理的表面硬度增加，这是因为在去除氧化物过程中形成的薄熔融层快速凝固。（5）阳极和阴极之间的间隙宽度的减小导致氧化物去除的能量效率的增加。当间隙宽度小于临界值时，阳极电位降消失。在这种情况下，输入能量的主要部分被消耗用于去除阴极上的氧化物。

项目成果

Effect of Pressure on the Behavior of Cathode Spots in Oxide Removal by Arc Discharge

压力对电弧放电去除氧化物中阴极斑点行为的影响

• 发表时间: 2006
• 期刊: ISIJ International Vol.46・No.2
• 作者: Hajime Mitsui;Shinsuke Kurihana;K.Arai;K.Arai;K.Arai;荒井健太郎;粟倉泰弘;N.Katagiri;片桐 誠之;N.Katagiri;N.Katagiri;N.Katagiri;杉本 尚哉;杉本 尚哉;武田 紘一
• 通讯作者: 武田 紘一

Cleaning characteristics of for organic contaminant on metal surface

金属表面有机污染物的清洗特性

• 发表时间: 2005
• 期刊: JSME International Journal,B 48・3
• 作者: H.Takahashi;K.Takeda;M.Sugimoto;M.Sugimoto
• 通讯作者: M.Sugimoto

Effect of pressure on cathode spots behavior in oxide removal by arc discharge

压力对电弧放电去除氧化物阴极斑点行为的影响

• 发表时间: 2004
• 期刊: Proc.21st International Symposium on Discharge 2
• 作者: H.Takahashi;K.Takeda;M.Sugimoto
• 通讯作者: M.Sugimoto

久保裕也, 武田紘一, 稲葉次紀, 岩尾徹: "真空アークによるステンレス表面酸化物の除去特性"電気学会論文誌A. 122A. 65-71 (2002)

Yuya Kubo、Koichi Takeda、Tsukinori Inaba、Toru Iwao：“真空电弧去除不锈钢表面氧化物的特性”日本电气工程师学会会刊 A. 65-71 (2002)。

S.L.Pozharov, A.M.Mirkarimov, K.Takeda: "The stability of group cathode spot on the surface of hot rolled steels"Technical Physics (American Institute of Physics). 47,9. 140-142 (2002)

S.L.Pozharov、A.M.Mirkarimov、K.Takeda：“热轧钢表面基团阴极点的稳定性”技术物理（美国物理研究所）。