Design and preparation of micro-nanostructures on the surface of titanium alloy artificial bone and analysis of the frictional properties of the processed surface

Abstract In this paper, we use laser processing method to process ortho-hexagonal microstructure on the surface of titanium alloy, and determine the optimal processing parameters according to the integrity and clarity of ortho-hexagonal processing. According to the experimental analysis, it is obtained that the processing speed is 300 mm/s, the power is 20 W and the frequency is 30 KHZ, the processing effect is the best. The optimized processing parameters were used to study the relationship between the weave height and the number of processing times. Using the method of multiple acid etching to prepare nanopores on the surface of titanium alloy, it is found that multiple acid etching can not only prepare nanoscale holes on the surface of titanium alloy, but also can well solve the slag left on the surface of titanium alloy by laser ablation. On top of that, the effect of friction reduction of micro-nano structures on the surface of titanium alloy with different shapes, edge lengths and heights is also investigated. Both theoretically and experimentally, the microshaped surfaces are analyzed to have better wear resistance and lower average friction coefficient compared with smooth surfaces. The effect of single factors on the average friction coefficient was analyzed, and the results showed that the average friction coefficient decreases and then increases with the increase of side length and height of the weave, and the average friction coefficient of the ortho-hexagonal array weave is the smallest and the average friction coefficient of the circular array weave is the largest among the four shapes. The effect of the interaction of factors on the average friction coefficient was investigated, and the results showed that the optimal average friction coefficient was 0.0902, corresponding to the characteristic values of 0.66 for the shape, 200 μm for the height, and 60 μm for the height.