Abstract
Due to the microscopic abrasive wear and surface fatigue in vivo, the substantial improvements of resistance to deformation and the bearing capacity of biomimetic artificial bone face severe challenges. In this paper, we proposed a novel artificial bone material composed of porous titanium scaffold and high entropy alloy coating through powder sintering and magnetron sputtering. It exhibited a similar porosity with the human bone tissue, as the equivalent permeability range realized with controllable pore diameter was approximately consistent with that of cortical bone. The thickness and qualities of the coating was optimized by analyzing the relationship between the cross-section morphologies and sputtering time. Depth-sensing nano-indentation experiments were used to equivalently imitate the flinty particle indentation. Both the porous structure and HEA coating were verified to enhance the Young’s modulus, hardness, and resistance to deformation of biomimetic bone joint material. Through the nano-indentation tests of the proposed bone materials with various pore diameters of porous scaffolds, a combination of HEA coating with a thickness 1.9 µm and porous scaffold with pore-forming agent diameter of 2.5 µm were experimentally confirmed to obtain the optimal surface mechanical properties.
Published Version
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