纳米Al2O3填充超高分子量聚乙烯的生物摩擦磨损性能研究

用纳米Al2O3对人工关节软骨UHMWPE进行填充改性,在生理盐水润滑条件下,评价了其摩擦磨损性能。结果表明,纳米Al2O3的加入,在一定程度上提高了UHMWPE的硬度,与钛合金对磨时的摩擦系数随Al2O3含量(<10%)的增加而增加;与不锈钢对磨时,摩擦系数有所增加;不同Al2O3含量(<10%)的UHMWPE,磨损率比纯UHMWPE低。纯UHMWPE的磨损表现为明显的犁沟以及塑性变形,加入纳米Al2O3的UHMWPE的磨损主要表现为磨粒磨损和轻微的塑性变形。

Study on Bio-tribological Properties of Nano Al2O3 Filled Ultrahigh Molecular Weight Polyethylene (UHMWPE)

The ultrahigh molecular weight polyethylene (UHMWPE) for artificial joint cartilage is filled with nano-Al_2O_3. It evaluated the friction and wear behaviors of UHMWPE/nano-Al_2O_3 system under the condition of lubrication of physiological saline. The experimental results showed that the hardness of the UHMWPE is improved in a way with the addition of nano-Al_2O_3.The friction coefficient of the nano-Al_2O_3 filled UHMWPE increases with the increasing of nano-Al_2O_3(<10%) while wearing against Ti-alloy; while the nano-Al_2O_3 filled UHMWPE wears against stainless steel, the friction coefficient increases in a way. The rates of wear of UHMWPE filled with different contents of nano-Al_2O_3 are lower than that of un-filled UHMWPE. The un-filled UHMWPE wears into plow and appears in plastic deformation, and the filled UHMWPE wear out in grain worn and has a slight plastic deformation.