Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy; Dept. of Production Engineering and Printing Technology, Akhbar Elyom Academy, 6th of October, Egypt.
Department of Engineering, University of Messina, Contrada Di Dio, I-98166 Messina, Italy.
Mater Sci Eng C Mater Biol Appl. 2017 Apr 1;73:234-244. doi: 10.1016/j.msec.2016.11.088. Epub 2016 Nov 25.
The majority of artificial joints incorporate biomedical grade Ultra High Molecular Weight Poly Ethylene (UHMWPE), whose wear is considered most important in controlling service time of the whole joint. The aim of this work was to improve wear resistance of UHMWPE through the addition of 0.5-2.0wt% of Carbon Nano Filler (CNF) and 2% wt of Paraffin Oil (PO) using ball milling (BM) and extrusion techniques (EX). The wear tests on these nanocomposites were conducted by a pin on disc in dry (air) and wet media (simulated synovial fluid or artificial lubricant, and bovine synovial fluid or natural lubricant). Mechanical tests (tensile and hardness), physical analysis (calorimetric, density, wet ability, roughness) and morphological observations were also performed. The experimental results showed that natural lubricant provides the greatest reduction in wear rate while the largest one occurred in air. Furthermore, the BM mixed nanocomposites with a filler load of 1.0% exhibited the best wear resistance among all the samples with an improvement of 42%, 64% and 83% in air, artificial and natural lubricant, respectively. This is due to its higher ductility and thermal features, and lower wet ability in the two lubricants.
大多数人工关节都采用生物医学级超高分子量聚乙烯（UHMWPE），其磨损被认为是控制整个关节使用寿命的最重要因素。本工作旨在通过球磨（BM）和挤出技术（EX），在 UHMWPE 中添加 0.5-2.0wt%的碳纳米填料（CNF）和 2wt%的石蜡油（PO），来提高其耐磨性。通过销盘在干（空气）和湿（模拟滑液或人工润滑剂、牛滑液或天然润滑剂）两种介质中对这些纳米复合材料进行了磨损测试。还进行了力学测试（拉伸和硬度）、物理分析（热重分析、密度、润湿性、粗糙度）和形貌观察。实验结果表明，天然润滑剂能最大程度地降低磨损率，而在空气中的磨损率最大。此外，在 1.0%的填充负载下，BM 混合纳米复合材料在空气、人工和天然润滑剂中的磨损率分别提高了 42%、64%和 83%，表现出最佳的耐磨性。这是由于其在两种润滑剂中具有更高的延展性和热性能，以及更低的润湿性。
