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-Mg17A112,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ld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.
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