AZ91HP镁合金激光熔凝层的耐蚀性和生物相容性

发布时间：2018-05-16 02:29

本文选题：医用镁合金 + 激光熔凝层　；参考：《材料热处理学报》2015年01期

【摘要】：为提高医用AZ91HP镁合金的耐蚀性和生物相容性,采用激光熔凝技术对镁合金进行熔凝处理。结果表明,AZ91HP镁合金熔凝层相组成为α-Mg和β-Mg17Al12,凝固组织为典型的树枝晶。模拟体液中腐蚀速率结果表明,熔凝层的耐蚀性较原始镁合金显著提高。在Hank’s中浸泡21 d后,可清楚看到一些絮状物沉积在熔凝层表面;能谱分析结果表明,絮状物中Ca,P比约为1.33,接近羟基磷灰石中Ca,P比(1.67)。原始镁合金的凝血酶原时间(PT)值为11.025 s,激光熔凝层的PT值为12.025 s,熔凝层具有较好的抗凝血性。细胞毒性实验结果表明,培养1 d后,在原始镁合金周围细胞出现破碎和固缩,极少数贴壁细胞。熔凝层表面则存在许多粘附细胞,熔凝层细胞死亡率较原始镁合金大有降低。
[Abstract]:In order to improve the corrosion resistance and biocompatibility of medical AZ91HP magnesium alloy, laser melting technology was used to melt the magnesium alloy. The results show that the melting layer of AZ91HP magnesium alloy consists of 伪 -Mg and 尾 -Mg17Al12.The solidification structure is a typical dendrite. The corrosion rate in simulated body fluid shows that the corrosion resistance of the melting layer is significantly higher than that of the original magnesium alloy. After being immersed in Hank's for 21 days, some flocculants were clearly deposited on the surface of the fused layer, and the results of energy spectrum analysis showed that the ratio of Ca-P to Ca-P in the flocculants was about 1.33, which was close to that in hydroxyapatite. The prothrombin time (PTT) of the original magnesium alloy was 11.025 s and the PT value of the laser fused layer was 12.025 s. The fusion layer had better anticoagulant effect. The results of cytotoxicity test showed that after 1 day of culture, the cells around the original magnesium alloy were broken and pyknotic, and a few adherent cells were observed. There are many adhesion cells on the surface of the melting layer, and the cell death rate of the fusion layer is much lower than that of the original magnesium alloy.
【作者单位】：东北电力大学机械工程学院;中海石油华鹤煤化有限公司;
【基金】：东北电力大学青年学术骨干科研促进计划项目
【分类号】：TG174.4

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