飞秒激光诱导纳米金刚石薄膜表面周期性结构的摩擦学性能研究  

Investigation on tribological performance of LIPSS-structured nano-crystalline diamond films

作　　者：崔雨潇 马家豪 阎兵[1] 戚厚军[1] 蔡玉俊[1] CUI Yuxiao;MA Jiahao;YAN Bing;QI Houjun;CAI Yujun(School of Mechanical Engineering,Tianjin University of Technology and Education,Tianjin 300222,China)

机构地区：[1]天津职业技术师范大学机械工程学院,天津300222

出　　处：《金刚石与磨料磨具工程》2022年第4期433-441,共9页Diamond & Abrasives Engineering

基　　金：国家自然科学基金(51705359)。

摘　　要：研究基于飞秒激光辐照方法在纳米金刚石(nano-crystalline diamond,NCD)薄膜表面制备的激光诱导周期性结构(laser-induced periodic surface structures,LIPSS)的摩擦学行为。在空气环境下采用脉冲宽度为200 fs,中心波长为1040 nm的掺镱光子晶体光纤飞秒激光辐照NCD薄膜表面产生LIPSS。基于不同的扫描间隔制备2种LIPSS表面,即连续分布的LIPSS表面(continuously distributed LIPSS,CDL)和均匀间隔的LIPSS带状表面(evenly spaced LIPSS stripes,ESLS)。通过球盘式摩擦磨损试验机进行往复式干摩擦试验来对上述2种LIPSS表面的摩擦学性能进行表征,其中的对磨球为ZrO_(2)陶瓷材质。往复式摩擦试验采用了平行和垂直于LIPSS纹理的2种摩擦方向。研究结果表明:施加LIPSS后的NCD薄膜表面容屑能力得到改善,同时摩擦接触面积降低,因而相比于原始NCD薄膜,其摩擦系数明显降低;对于CDL表面,摩擦方向与LIPSS纹理垂直时的摩擦系数比纹理平行时的更高;ESLS表面的LIPSS纹理方向对摩擦系数无影响。The aim of present work was to investigate the tribological behavior of CVD nano-crystalline diamond(NCD)films with laser-induced periodic surface structures(LIPSS).The LIPSS textures were fabricated in ambient air using a Yb-doped photonic crystal fiber amplifier femtosecond(fs)laser with pulse duration of 200 fs and central wavelength of 1040 nm.Two types of LIPSS texture,namely continuously distributed LIPSS(CDL)texture and a complex texture formed of evenly spaced LIPSS stripes(ESLS),were obtained with the above processing conditions.The tribological behavior of as-fabricated LIPSS textures was evaluated via ball-on-disc tests in dry reciprocating sliding motion,and ZrO_(2) ceramic balls were used as counterparts.In addition,there were two types of reciprocating direction involved in the frictional tests,namely the direction parallel/vertical to the orientation of LIPSS ripples.The results in-dicate that as the LIPSS can work as reservoir for wear debris and reduce the contact area during the friction process,the LIPSS textured NCD surface showed obviously reduced friction coefficient in comparison with the conventional NCD surface,which was reduced from 0.42 to 0.09.Besides,for the CDL surface,the friction coefficient as the LIPSS ripples vertical to the reciprocating direction was higher than that as the LIPSS ripples parallel to the reciprocating direction.In the case of ESLS surface,however,the direction of the LIPSS ripples had little influence on the friction coefficient.

关 键 词：纳米金刚石薄膜 飞秒激光辐照 激光诱导周期性表面结构 摩擦性能 

分 类 号：TQ164[化学工程—高温制品工业]