脉冲光纤激光制备聚晶金刚石疏液表面的研究

Study on Fabrication of Lyophobic PCD by Pulsed Fiber Laser

针对聚晶金刚石(PCD)表面,提出了一种经济、高效、可控制备多种微观结构的激光加工方法,与低表面能处理技术相结合,可实现对表面特性的有效调控。利用激光表面织构化方法在PCD表面制备出含有沟槽和锥形凸起的微纳结构,并分析了单脉冲能量和扫描速度对微观结构形貌和特征尺寸参数的影响;将激光织构化的PCD表面进行氟化处理,分析PCD表面微观结构对疏水和疏油性的影响规律。结果表明:随着单脉冲能量的增加或扫描速度的降低,沟槽深度、山脊间距和表面粗糙度随之增大;低表面能处理后,PCD表面与水和乳化剂的接触角分别在93°～149°和102°～134°范围内变化,由此可实现对PCD表面不同润湿性的控制。另外,分析了PCD表面微观结构的形成机理,并探讨了微观结构参数对疏水疏油性能的影响规律。

In view of PCD surfaces,an economic,efficient and controllable method on fabrication of microstructure by laser processing was proposed herein,combined with low surface energy treatment technology,the characteristics of the surface might be regulated effectively.First of all,micro grooves and micro conical convexes were formed on the surface of PCD by using laser surface texturing method.And the effects of single pulse energy and scanning speed on the microstructure morphology and characteristic size parameters were analyzed.Then,the laser textured PCD surfaces were treated with fluorination,and the influences of the surface microstructure of PCD on the hydrophobicity and lipophobicity were analyzed.The results show that with the increases of single pulse energy or the decreases of the scanning speed,the parameters of groove depth,the ridge spacing and surface roughness increases.After low surface energy treatment,the contact angles of water are in the range93°~149°and 102°~134°respectively,which realize the control on different wettability of PCD surfaces.In addition,the formation mechanism of microstructure on PCD surfaces was analyzed,and the influences of microstructure on hydrophobicity and lipophobicity were discussed.