An effective method of edge deburring for laser surface texturing of Co-Cr-Mo alloy

An effective method of edge deburring in laser surface texturing was presented. Tribologically, suitably orientated micro-dimples on Co-Cr-Mo alloy can effectively reduce interfacial friction due to their storing of wear debris. However, burrs generated around dimple rim during laser irradiation inclined to cause plowing wear due to their piercing and cutting effect. This study was conducted to evaluate a technique for improving the quality of the laser-irradiated textures by implementing a freezing water layer to cover onto the texturing substrate surface. The existence of such freezing water layer reduced both Young’s modulus and hardness of the substrate material around the peripheral edge of the laser-ablated textures. Experimental results showed that integrating the laser texturing technology with the freezing water layer effectively constrained the deburring, and its beneficial mechanism in improving the quality of textures was also propounded. The irradiation technique reduced simultaneously the friction coefficient and wear.