SrO/Ti-3Cu复合材料的耐磨性与生物相容性

Wear resistance and biocompatibility of SrO/Ti-3Cu composite materials

  • 摘要: 为提高Ti-Cu合金的生物相容性及生物活性,采用放电等离子烧结技术制备了3wt.%Cu与不同质量分数SrO共掺钛的复合材料(SrO/Ti-3Cu)。利用显微硬度计、XRD、XPS、光学显微镜、SEM、摩擦仪等对材料的微观结构、组织形貌及耐磨性进行分析。平板计数法、CCK-8、细胞死活染色、碱性磷酸酶活性检测用于评价各组材料的抗菌性能、细胞生物相容性及促成骨活性进行评价。结果表明,随着SrO含量的上升,复合材料的相对致密度呈下降趋势,显微硬度无显著变化。当SrO的含量为3%时,材料的摩擦系数和磨损率最低,相较于其他材料明显降低,展现优异的耐磨性。抗菌结果显示,复合材料的抗菌率均超过98%,具有强烈的抗菌效果。体外细胞实验结果表明,复合材料浸提液促进成骨细胞增殖及融合生长,并且上调了成骨细胞碱性磷酸酶的活性,而含量3%SrO的复合材料具有最佳的体外生物相容性和促成骨分化功能。

     

    Abstract: To improve the biocompatibility and bioactivity of Ti-Cu alloy, the composite material (SrO/Ti-3Cu) was prepared by spark plasma sintering (SPS), incorporating 3wt.% Cu and varying mass fractions of SrO co-doped titanium. To analyze the microstructure, morphology, and wear resistance of composites using micro-hardness tester, XRD, XPS, optical microscope, SEM, friction tester, etc. Plate counting method, CCK-8, cell viability staining, and alkaline phosphatase (ALP) activity detection were used to evaluate the antibacterial performance, cell biocompatibility, and bone activity of each group of materials. The results indicated that as the SrO content increases, the relative density of composites decreases, while the micro-hardness shows no significant change. When the SrO content reached 3%, the material demonstrated the lowest coefficient of friction and wear rate, significantly outperforming other compositions in terms of wear resistance. Antibacterial tests revealed that all composites achieved an antibacterial rate exceeding 98%, indicating strong antimicrobial efficacy. In vitro cell experiments showed that composites extract promoted the proliferation and fusion growth of osteoblasts, and upregulated the ALP activity. Notably, the composite containing 3% SrO exhibited the best in vitro biocompatibility and promotes osteogenic differentiation potential.

     

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