乙醇辅助激光一步法制备硬质合金疏水表面

目的 在YT15硬质合金刀片上制备出具有疏水特性的织构表面.方法 在静态的无水乙醇环境中,利用光纤激光打标机,在YT15硬质合金刀片上制备织构,制备好的织构表面不做任何改性处理.根据织构表面形貌、织构表面化学成分,分析加工环境及激光参数对织构表面润湿性的影响.结果 无水乙醇辅助激光制备的织构表面表现出了疏水特性,疏水角的大小受激光参数影响.激光功率增大,织构表面接触角随之增大,功率为12～20 W时,接触角为112.5°～126.9°;激光扫描速度增加,织构表面接触角随之减小,扫描速度为0.5～2.5 mm/s时,接触角为118.3°～125.7°.当加工次数为1,激光频率为200 kHz,扫描速度为1 mm/s,功率为20 W时,织构表面的接触角最大,为126.9°.结论 无水乙醇环境中,采用激光技术在YT15刀片上制备出了新型的环形凸起微纳织构.与无织构表面相比,织构表面C原子明显增加,表现出了疏水特性.织构表面接触角的大小与织构形貌有关,环形凸起织构密度越大,接触角越大.环形凸起织构的密度受激光参数影响.织构形貌及表面化学成分决定了表面的润湿特性.

One-step Preparation of Hydrophobic Surface of Cemented Carbide by Ethanol-assisted Laser

To prepare hydrophobic textured surface on YT15 cemented carbide blade by one-step method. Texture was prepared on YT15 cemented carbide blade by fiber laser marking machine in static anhydrous ethanol environment. The effect of processing environment and laser parameters on texture surface wettability was analyzed based on texture surface morphology and chemical composition. Results show that the texture surface prepared by ethanol assisted laser showed hydrophobic properties, and the hydrophobic angle was affected by laser parameters. With the increase of laser power, the contact angle of textured surface increases. The contact angle is 112.5° to 126.9° in the range of 12~ 20 W. With the increase of laser scanning speed, the contact angle of textured surface decreases. When the scanning speed is 0.5~2.5 mm/s, the contact angle is 118.3° to 125.7°. When the laser parameters are processing times=1, laser frequency=200 kHz, scanning speed=1 mm/s and power=20 W, the contact angle of textured surface is the largest, which is 126.9°. In the environment of absolute ethanol, a new type of ring convex micro nano texture was prepared on YT15 blade by laser technology. Compared with the non textured surface, C atoms increased significantly, and the texture surface showed hydrophobic characteristics. The contact angle of textured surface was related to the texture morphology. The higher the ring convex texture density was, the greater the contact angle was. The density of ring convex texture was affected by laser parameters. The surface wettability is determined by texture morphology and surface chemical composition.