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采用大气等离子喷涂在镁合金AZ31B表面制备了可降解钙/磷涂层。利用XRD、SEM、EDS分析了涂层的相组成、结晶度及在人体模拟液(SBF)中浸泡前后的显微形貌和元素组成,根据pH值和降解速率研究了涂层的体外降解性能。研究表明:钙/磷涂层与镁合金基体紧密结合,致密度高,涂层由较难降解的HA相和较易降解的Ca3(PO4)2、Ca4P2O9和CaO组成,涂层中HA结晶度为49.3%。生物降解性能研究显示,钙/磷涂层材料在SBF溶液中的pH值和降解速率均小于镁合金基体,且较小的变化幅度使涂层材料的降解行为控制在稳定范围内。
The degradable calcium / phosphate coatings were prepared on AZ31B magnesium alloy by atmospheric plasma spraying. The phase composition, crystallinity and micro-morphology and elemental composition of the coating before and after soaking in human simulated liquid (SBF) were analyzed by XRD, SEM and EDS. The degradation performance of the coating in vitro was studied according to pH value and degradation rate . The results show that the calcium / phosphorus coating is tightly combined with the magnesium alloy matrix and has a high density. The coating consists of the more degradable HA phase and the more degradable Ca3 (PO4) 2, Ca4P2O9 and CaO. The HA crystallinity 49.3%. Biodegradability studies showed that the pH value and degradation rate of calcium / phosphorus coating material in SBF solution were less than that of magnesium alloy substrate, and the smaller variation range controlled the degradation behavior of coating material in a stable range.