Ultrafast laser-chemical modification hybrid fabrication of hydrostatic bearings with a superhydrophobicity solid-liquid interface  

作　　者：GUO MingHui RONG YouMin HUANG Yu FENG XiaoLin HU HaiDong WU CongYi ZHANG GuoJun 

机构地区：[1]State Key Laboratory of Intelligent Manufacturing Equipment and Technology,Huazhong University of Science and Technology Wuhan 430074,China [2]School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [3]Faculty of Engineering and Life Sciences,Universiti Selangor Bestari Jaya,Selangor 45600,Malaysia

出　　处：《Science China(Technological Sciences)》2024年第3期696-708,共13页中国科学（技术科学英文版）

基　　金：supported by the National Key R&D Program of China(Grant No. 2020YFB2007600);National Natural Science Foundation of China(Grant Nos. 51875223 and 52188102);Guangdong HUST Industrial Technology Research Institute, Guangdong Provincial Key Laboratory of Manufacturing Equipment Digization(Grant No. 2020B1212060014)。

摘　　要：Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation and chemical modification method is proposed to prepare surfaces with microbulge array structure on 6061 aluminum alloy substrates. Because of the low surface energy of the perfluorododecyltriethoxysilane modification and the bulge geometry of the microbulge array structure, the surface shows excellent superhydrophobicity. The optimum contact angle in air for water is 164°, and that for oil is 139°. Two surfaces with “lotus-leaf effect” and “rose-petal effect” were obtained by controlling the processing parameters. The drag reduction properties of superhydrophobic surfaces were systematically investigated with slip lengths of 22.26 and 36.25 μm for deionized water and VG5 lubricant, respectively. In addition, the superhydrophobic surface exhibits excellent mechanical durability and thermal stability. The proposed method provides a new idea for vortex suppression in hydrostatic bearings and improves the stability of bearings in high-speed operation.

关 键 词：superhydrophobicity surface ultrafast laser drag reduction solid-liquid interface microbulge array structure 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TH133.36[机械工程—机械制造及自动化]