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Atomic Behavior of Oxygen Adsorption and Its Effect on the Mitigation of Metallic Adhesion

氧吸附的原子行为及其对减轻金属粘附的影响

基本信息

批准号：
60550107
负责人：
OHMAE Nobuo
金额：
$ 0.9万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60550107/
关键词：
Metallic Adhesion Oxygen Adsorption Coverage Field Ion Microscopy スペーストライボロジ

项目摘要

A field ion microscope (FIM) has been used to investigate the behavior of oxygen adsorption on W-tip, and extended to the study of the effect of oxygen adsorption on adhesion of W to Au. The adsorption of oxygen on the central (011) was found to be less than those on the other planes with lower work functions. Owing to the highest work function of the [110], the adsorption occurred as the last site. Field emission current measurement and Auger electron spectroscopy on the adsorption of oxygen on tungsten showed that the coverage is unity at an exposure of 200 Langmuirs (L). An adhesion contact in ultrahigh vacuum of the FIM was carried out using a W-tip either with or without oxygen adsorption. It was found that adhesion force decreased with increasing oxygen exposures up to 60 L. With an oxygen exposure of 16 L, an intermediate adhesion resulted. Adhesion is thus dependent upon the coverage of oxygen. The depth of adhesion-induced lattice defects was studied using the field evaporation technique. Over 200 L, adhesion force was not detectable, nor was distortion of W atoms. The results obtained in this study could be extended to the problems involved in space tribology, especially to the mitigation of friction and wear of machine elements which function at an altitude of 500 km where oxygen exists.

用场离子显微镜研究了氧在钨针尖上的吸附行为，并将其推广到氧吸附对钨与Au结合的影响的研究。发现中心（011）上的氧吸附量小于功函数较低的其他平面上的氧吸附量。由于[110]的功函数最高，吸附发生在最后一个位点。场发射电流测量和俄歇电子能谱研究表明，在200朗缪尔（L）的曝光量下，钨上的氧吸附覆盖率是一致的。使用W-尖端在具有或不具有氧吸附的情况下进行在真空中的粘附接触。结果发现，粘附力随着氧气暴露量的增加而降低，直至60 L。在16 L的氧暴露下，产生中间粘附。因此，粘附力取决于氧的覆盖。利用场蒸发技术研究了粘附诱导晶格缺陷的深度。超过200 L，没有检测到粘附力，也没有W原子的变形。这项研究所获得的结果可推广到空间摩擦学所涉及的问题，特别是减轻在500公里高空有氧气存在的机器元件的摩擦和磨损。