耐磨防覆冰聚四氟乙烯表面设计与加工

Design and processing of wear-resistant and ice-resistant PTFE surface

冰射流清洗设备料仓表面的覆冰常造成设备停机维修,但如何降低料仓表面的覆冰粘附力是目前研究的难点。本文采用CO_(2)激光刻蚀聚四氟乙烯(PTFE)获得超疏水表面,并设计了一种菱形支撑肋阵列结构提高超疏水PTFE表面的耐磨性。CO_(2)激光刻蚀能在PTFE表面形成多层次交错堆叠纤维结构,且激光刻蚀后的表面化学成分无明显变化。在50μm激光扫描线间距、300 mm/s扫描速度和9 W激光功率下,可获得164°接触角、4°滚动角的超疏水PTFE表面。设计的30°顶角角度、3 mm菱形边长和0.05 mm肋边宽度的菱形支撑肋阵列结构可有效提高超疏水PTFE表面的耐磨性。即使被砂纸摩擦6 m后,具有菱形支撑肋阵列结构的超疏水PTFE表面仍能保持良好的超疏水性,且覆冰粘附力仅为普通PTFE表面的50%。本耐磨防覆冰PTFE表面有望应用于冰射流清洗设备。

The icing on the surface of the silo of the ice jet cleaning equipment often causes the equipment to shutdown for maintenance,but how to reduce the icing adhesion on the silo surface is a difficulty of current research.In this work,CO_(2)laser was used to etch polytetrafluoroethylene(PTFE)to obtain a superhydrophobic surface,and a rhombus support rib array structure was designed to improve the wear resistance of the superhydrophobic PTFE surface.CO_(2)laser etching could form a multi-layer staggered stacked fiber structure on the PTFE surface,and there was no obvious change in the chemical composition of the surface after laser etching.The superhydrophobic PTFE surface with contact angle of 164°and rolling angle of 4°can be obtained at laser scanning line spacing of 50μm,scanning speed of 300 mm/s,and laser power of 9 W.The designed rhombus support rib array structure with crest angle of 30°,length of side of 3 mm and rib width of 0.05 mm can effectively improve the wear resistance of superhydrophobic PTFE surface.Even after being rubbed by sandpaper for 6 m,the superhydrophobic PTFE surface with rhombus support rib array structure can still maintain excellent superhydrophobicity,and the icing adhesion of it is only 50%of that of ordinary PTFE surface.The wear-resistant and ice-resistant PTFE surface is expected to be used in ice jet cleaning equipment.