Fabrication Of Friction Reduced Surface Structures For Artificial Hip Joints Using Laser Interference

In thisstudy, a cost and efficient method for the fabrication of highly ordered microstructures on the Co-Cr-Mo implant alloy by three-beam laser interference lithography(LIL) with the Nd:YAG laser of 1064 nm wavelength was presented. The mechanisms of the friction and wear were discussed and analyzed in order to enhance the tribological characteristic and hardness performance. Different laser parameters were used to study the effects of them on the surface modification. The surface morphology was observed by scanning electron microscope(SEM). The friction coefficientsof different modified samples were characterized using the RTEC micro-friction and wear tester, and the hardness measurement was carried out using the MH-60 microhardness tester. A combination of laser interference parameters including theTE-TM-TM polarization mode, 0.2J/cm2 laser fluence and 5° incident angleachieved an8.8% hardness increase and about 69.1% friction coefficient decrease. The optimized improvement of tribological properties was achieved by the proper selection of polarization modes, laser influences and incident angles.