Liu Gen, Li Guitao, Zhao Fuyan, Myshkin Nikolai K, Zhang Ga
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2021 Oct 5;11(52):32717-32729. doi: 10.1039/d1ra05447c. eCollection 2021 Oct 4.
Corrosion and wear products of metallic implants can lead to severe adverse tissue reactions. However, there is an absence of effective means to reduce the tribocorrosion of metal. The main purpose of this study is to reveal a mechanism of engineering a barrier layer on metal surfaces adding functional particles into the polymer counterpart. BC and BN particles were compounded into a polyetheretherketone (PEEK) matrix and their tribological performance of PEEK-based composites sliding against stainless steel was compared in simulated body fluid. Results demonstrate that the addition of BC reduces significantly friction and wear. In particular, the addition of only 1 vol% BC reduces wear of PEEK by up to 94.8%, and tribocorrosion of steel is also obviously mitigated. It is discovered that hydrolysis of BC particles triggered by friction and deposition of Ca and phosphate ions dominate formation of the barrier layer at the friction interface. The barrier layer endows the PEEK-metal sliding pair simultaneously enhanced anti-wear and anti-corrosion performance.
金属植入物的腐蚀和磨损产物会导致严重的不良组织反应。然而，目前缺乏有效手段来减少金属的摩擦腐蚀。本研究的主要目的是揭示一种在金属表面构建阻挡层的机制，即将功能颗粒添加到聚合物配对物中。将BC和BN颗粒复合到聚醚醚酮（PEEK）基体中，并在模拟体液中比较了基于PEEK的复合材料与不锈钢滑动时的摩擦学性能。结果表明，添加BC可显著降低摩擦和磨损。特别是，仅添加1 vol%的BC就能使PEEK的磨损降低高达94.8%，同时钢的摩擦腐蚀也明显减轻。研究发现，摩擦引发的BC颗粒水解以及钙和磷酸根离子的沉积主导了摩擦界面处阻挡层的形成。该阻挡层使PEEK-金属滑动副同时具有增强的抗磨损和抗腐蚀性能。
