To ensure and lengthen the service life of artificial joint(titanium alloy/ultra high molecular weight polyethylene)
the liquid spreading flow properties and tribological properties of biomimetic tree-like networks texture are investigated. Three kinds of surface textures with different branch numbers and branch angles(cross-shaped network
T-shaped network
Y-shaped network)are designed. Each kind of tree-like networks texture is prepared in texture ratios of 10%
15%
20%respectively. The liquid spreading fluidity and tribological properties of biomimetic tree-like networks are evaluated by the experiments. All the three kinds of textured surfaces are able to reduce the instantaneous contact angle and realize the liquid spreading completely within a certain period and are endowed with good antifriction properties. The Y-shaped network texture has the best liquid spreading flow property
whose instantaneous contact angle of 2 μL liquid in 10%texture ratio is 23.37°
and the liquid can fully spread in 0.95 seconds. The friction coefficient of T-shaped network texture gets only 0.077 in 15%texture ratio
which lowers by 38%compared with the original surface. This approach is beneficial to self-lubricating friction reduction design of artificial joint.
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references
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