Mg-Zn-Ca合金的性能及降解速率控制

以经过铸造和热挤压的Mg-Zn-Ca合金为研究对象，利用光学显微镜、万能试验机对合金的微观组织以及机械性能进行了分析测试.采用仿生法在该合金表面形成了羟基磷灰石(HA)涂层.利用X射线衍射仪和扫描电子显微镜对涂层结构和形貌进行分析与观察，并对有、无涂层试样进行腐蚀实验研究.结果表明:采用铸造和热挤压技术制备的Mg-Zn-Ca合金抗拉强度和抗压强度与人骨接近，分别为365MPa和338MPa；屈服强度为360MPa，延伸率为1025%，弹性模量为4169GPa.HA涂层能一定程度上降低合金试样的降解速率.

Mechanical Properties and Controlling Degradation Rate of Mg-Zn-Ca Alloy

The Mg Zn Ca alloy formed by casting and hot extrusion was systematically studied. The microstructure and mechanical behaviors of the alloy were analyzed by an optical microscopy and universal testing machine. The hydroxyapatite (HA) coatings on the surface of this magnesium alloy were deposited using a biomimetic technique. The HA coatings were characterized by XRD， and the morphology of the sample surface was observed by SEM. The degradation rates of the samples without and with HA coatings were researched in vitro corrosion. The results indicated that the tensile strength and compressive strength of Mg Zn Ca alloy were close to the human bones， and the values were 365MPa and 338MPa， respectively， and the yield strength， elongation and elastic modulus of the alloy were 360MPa， 1025%， 4169GPa， respectively. The degradation rates of the samples with HA coatings was slower than that of the samples without HA coatings on the surface.