Abstract The aim of this paper was to evaluate the tribological performance of bioactive zirconia composite layers applied by press and sinter method on yttria-stabilized zirconia (YSZ) substrates. Two types of bioactive zirconia composite layers were tested, zirconia reinforced by 10 vol% of HAp and by 10 vol% of β-TCP. The wear tests were carried out in Phosphate Buffered Saline (PBS) solution at 37 ± 2 oC using a ball-on-plate configuration. The wear mechanisms of the samples were identified by SEM/EDS. Fracture toughness, hardness and roughness were also evaluated. Results indicated that the tribological performance was not affected by the addition of bioactive materials. The specific wear rates were within the same order of magnitude and no change in the coefficient of friction was observed among all samples. These results show that this new approach based on the use of a bioactive zirconia composite layer on zirconia substrate, is a promising solution for implants, as it is possible to maintain the high tribological properties of zirconia and in the same time to improve bond between living tissue and implant, as the HAp and β-TCP are acting as bioactive sites.

中文翻译：

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氧化锆结构上生物活性氧化锆复合层的摩擦学表征

摘要 本文的目的是评估通过压制和烧结方法在氧化钇稳定氧化锆 (YSZ) 基材上应用的生物活性氧化锆复合层的摩擦学性能。测试了两种类型的生物活性氧化锆复合层，氧化锆由 10 vol% 的 HAp 和 10 vol% 的 β-TCP 增强。磨损测试在磷酸盐缓冲盐水 (PBS) 溶液中进行，温度为 37 ± 2 oC，使用球板配置。通过SEM/EDS识别样品的磨损机制。还评估了断裂韧性、硬度和粗糙度。结果表明，摩擦学性能不受添加生物活性材料的影响。特定磨损率在同一数量级内，所有样品的摩擦系数均未发生变化。