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| 1 | Forming of magnesium alloy microtubes in the fabrication of biodegradable stents显示文摘Magnesium alloys have, in recent years, been recognized as highly promising biodegradable materials, especially for vascular stent applications. Forming of magnesium alloys into high-precision thin-wall tubes has however presented a technological barrier in the fabrication of vascular stents, because of the poor workability of magnesium at room temperature. In the present study, the forming processes, i.e., hot indirect extrusion and multi-pass cold drawing were used to fabricate seamless microtubes of a magnesium alloy. The magnesium alloy ZM21 was selected as a representative biomaterial for biodegradable stent applications. Microtubes with an outside diameter of 2.9 mm and a wall thickness of 0.2 mm were successfully produced at the fourth pass of cold drawing without inter-pass annealing. Dimensional evaluation showed that multipass cold drawing was effective in correcting dimensional non-uniformity arising from hot indirect extrusion. Examinations of the microstructures of microtubes revealed the generation of a large number of twins as a result of accumulated work hardening at the third and fourth passes of cold drawing, corresponding to the significantly raised forming forces. The work demonstrated the viability of the forming process route selected for the fabrication of biodegradable magnesium alloy microtubes. | Lixiao Wang Gang Fang Lingyun Qian Sander Leeflang Jurek Duszczyk Jie Zhou | 2014 | Progress in Natural Science:Materials International2014，24，5： | 2 |
| 2 | 生物可降解羟基磷灰石颗粒增强镁基复合材料的制备及表征(英文)显示文摘采用粉末冶金方法制备了生物可降解的纯镁基体和不同百分含量的羟基磷灰石颗粒增强镁基复合材料。通过压缩试验和电化学测试对复合材料的机械性能和耐腐蚀性能进行了研究。结果表明,复合材料的压缩屈服强度明显高于纯镁基体,并且随着羟基磷灰石含量的增加而提高;电化学测试结果表明,复合材料在生物模拟体液中的腐蚀电位与纯镁基体相比明显提高,其中Mg-20%HA复合材料的腐蚀电位为-1.582 V,腐蚀电流密度为10.84μA/cm2。 | 苏颖超 李大勇 卢成嘉 连建设 李光玉 | 2014 | 稀有金属材料与工程2014，43，S1： | 2 |
| 3 | 医用Mg-1.0Ca合金微弧氧化膜生物相容性研究显示文摘使用微弧氧化技术对医用Mg-1.0Ca合金进行表面改性,采用扫描电镜(SEM)、X射线衍射(XRD)、析氢实验以及MTT法表征微弧氧化膜的性能。扫描电镜和XRD分析表明,氧化膜是一种典型的多孔结构,含有氧化镁、硅酸镁和硅酸钙等。在模拟体液中浸泡72 h后,氧化膜中钙和磷的含量显著增加,表明氧化膜具有很好的生物活性。析氢实验表明,微弧氧化能大大提高Mg-1.0Ca合金的耐蚀性。Mg-1.0Ca合金氧化前后的细胞毒性均为1级,表明基体以及氧化试样均具有良好的生物相容性。 | 曲彪 常乐 张淑芳 刘志凌 刘洋 张荣发 | 2014 | 稀有金属材料与工程2014，43，S1： | 1 |
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