Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran.
J Mech Behav Biomed Mater. 2010 Feb;3(2):178-88. doi: 10.1016/j.jmbbm.2009.08.003. Epub 2009 Aug 11.
Implants made of nickel free austenitic stainless steel can reduce the toxic effect of released nickel ion and compounds from the conventional stainless steels. On the other hand, hydroxyapatite is a ceramic which has been used in orthopaedic applications due to its good osteoconductivity, biocompatibility and bioactivity. However, there is no evidence in the literature up to now on producing composites based on nickel free stainless steel and hydroxyapatite and study of their tribology. The aim of this work was to produce novel biocomposites made up of nickel free stainless steel with hydroxyapatite (prepared by heat treating bone ash) and studying their tribology under various loads in air and in Ringer's physiological solution. Different amounts of hydroxyapatite powder (10, 20, 30 and 40% Vol.) were added to this nickel free stainless steel powder to get the biocomposites. Variation of their density, hardness, wear resistance and friction with the ceramic (hydroxyapatite) content and wear load were investigated in air and in Ringer's solution. The density of the composites was decreased by increasing the volume percentage of the hydroxyapatite, while wear resistance of the composites was increased. The wear mechanism of these composites was changed by increasing the wear load and consequently the volume loss was enhanced dramatically. Furthermore, by increasing the sliding distance, the rate of volume loss was decreased slightly. The friction coefficient of the composites was also decreased by increasing the weight percentage of hydroxyapatite. Effect of the physiological Ringer's solution on wear resistance and friction coefficient of the composites was nearly negligible. The wear mechanisms of the samples were identified by studying the SEM images of the worn surfaces of the tested samples in different wear loads and HA contents.
由不含镍的奥氏体不锈钢制成的植入物可以减少传统不锈钢中释放的镍离子和化合物的毒性作用。另一方面，羟基磷灰石是一种陶瓷，由于其良好的骨传导性、生物相容性和生物活性，已在骨科应用中使用。然而，到目前为止，还没有关于生产基于无镍不锈钢和羟基磷灰石的复合材料以及研究它们的摩擦学的文献证据。这项工作的目的是生产由无镍不锈钢和羟基磷灰石（通过热处理骨灰制备）组成的新型生物复合材料，并研究它们在空气和林格氏生理溶液中的各种载荷下的摩擦学。向这种无镍不锈钢粉末中添加不同量的羟基磷灰石粉末（10、20、30 和 40%体积）来制备生物复合材料。研究了它们的密度、硬度、耐磨性和摩擦性随陶瓷（羟基磷灰石）含量和磨损载荷在空气中和林格氏溶液中的变化。复合材料的密度随着羟基磷灰石体积百分比的增加而降低，而复合材料的耐磨性则增加。随着磨损载荷的增加，这些复合材料的磨损机制发生了变化，因此体积损失显著增加。此外，随着滑动距离的增加，体积损失率略有下降。复合材料的摩擦系数也随着羟基磷灰石重量百分比的增加而降低。生理林格氏溶液对复合材料的耐磨性和摩擦系数的影响几乎可以忽略不计。通过研究不同磨损载荷和 HA 含量下测试样品磨损表面的 SEM 图像，确定了样品的磨损机制。
