Adhesive and corrosive wear at microscales in different vapor environments  

作　　者：Sihan SHEN Yonggang MENG 

机构地区：[1]State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China

出　　处：《Friction》2013年第1期72-80,共9页摩擦（英文版）

基　　金：the National Natural Science Foundation of China(NSFC,Nos.91123033 and 51021064).

摘　　要：Adhesive and corrosive wear at microscales are quantitatively distinguished in lifetime tests of resonant bulk-fabricated silicon microelectromechanical systems(MEMS).By analyzing the oscillation decay characteristics in different vapor environments,we find that wear is dominated by asperity adhesion during the initial stages of rubbing in dry N2 or O2/N2 mixtures;in these situations the transient wear rate is inversely proportional to the wear depth.But in water or ethanol vapors,chemical reactions between the corrosive adsorbed layer and the silicon substrate limit the wear rate to a constant.These observations are consistent with atomic explanations.The differences between adhesive and corrosive wear explain the advantages offered by lubricating with alcohol vapors rather than using dry environments for tribo-MEMS devices.Compared to ethanol,the relatively poor anti-wear effect of water vapor is explained by aggressive and rapid tribo-reactions.

关 键 词：adhesive wear corrosive wear microelectromechanical systems(MEMS) 

分 类 号：TG1[金属学及工艺—金属学]