| 摘要: |
| 研究纯镁及其超声微弧氧化生物涂层种植体植入动物股骨干内的短期降解过程。利用电化学工作站测定试样在模拟体液中极化曲线。术后4周，取兔股骨干的组织进行扫描电镜观察（SEM）及锥形束检测（CBCT）观察种植体降解状况。结果表明，纯镁与超声微弧氧化生物涂层都发生了降解，在骨组织表面及镁基体的表面几乎同时发生反应，在金属-骨界面形成紧密相邻的降解层、新生骨层，并可见少量的不连续的纤维结缔组织，超声微弧氧化镁生物涂层的腐蚀降解速率及对周围骨组织的刺激明显小于纯镁基体。纯镁基体及超声微弧氧化涂层试样周围的骨组织变化符合正常骨组织的愈合过程，超声微弧氧化生物涂层显示出更好的生物相容性及降解性。 |
| 关键词: 微弧氧化生物涂层 超声 纯镁 降解性 骨生长 |
| DOI： |
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| 基金项目:国家自然科学基金(31070859); 黑龙江省自然科学重点基金(ZD201008) |
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| Degradation Behavior of Ultrasound Micro-arc Oxidation Coating on Pure Magnesium After Implanted Four Weeks |
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MIAO Bo, LV Yan, LIU Miao, LI Mu-qin, QU Li-Jie
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a. The Second Affiliated Hospital, b. Key Laboratory of Biomedical Materials of Heilongjiang Province Colleges, Jiamusi University, Jiamusi 154007, Heilongjiang
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| Abstract: |
| Micro-arc oxidation(MAO) ceramic coating of ZM5 alloy was prepared in the silicate electrolyte system with nano-graphite particle. The micro morphology, chemical and phase composition were investigated by SEM, EDS and XRD. At room temperature, the tribological properties of coatings were evaluated by a ball-on-disc wear test machine. The results show that the MAO ceramic coating with nano-graphite is composed by Mg2SiO4, MgO, Mg, and C. Graphite disperses in the coating through mechanical effect and shows antifriction effect. The volume friction rate of the MAO ceramic coating with nanographite is 9.19×10-5 mm3/Nm under the load of 4.9 N. It is one-fourteenth of that of ZM5 substrate and onethird of that of MAO ceramic coating without graphite. The volume friction rate of the MAO ceramic coating with nano-graphite is 1.44×10-4 mm3/Nm under the load of 9.8 N. It is one-eighth of that of ZM5 substrate and two-fifth of that of the MAO ceramic coating without graphite. The wear resistance of ZM5 substrate increases dramatically because of the MAO ceramic coating with nano-graphite. The wear mechanism of the MAO ceramic coating with nanographite is fatigue wear from the fatigue spalling morphology. |
| Key words: micro-arc oxidation biocoating ultrasound pure magnesium degradation bone growth |
