The present study addresses a thin-walled investment casting methodology of AZ91D-1 wt% CaO magnesium alloy for stent manufacturing. Additive manufacturing and Yttria-based coating were applied to optimize the process. An induction melting furnace assisted by vacuum was used to cast magnesium alloy stents with 0.4 mm and 0.8 mm wall thickness under an argon-protective atmosphere. According to the proposed methodology and the results obtained for coated models, no metal-mould interface reactions were found, revealing samples with a good surface finish and sane microstructure. The cast magnesium stents without coating were compromised, resulting in samples with a high degree of reactions and impurities. Microscopic examination and hardness measurements demonstrated the effectiveness of the process.

本研究涉及用于支架制造的 AZ91D-1 wt% CaO 镁合金的薄壁熔模铸造方法。应用增材制造和氧化钇涂层来优化工艺。采用真空辅助感应熔炼炉在氩气保护气氛下铸造壁厚为0.4mm和0.8mm的镁合金支架。根据提出的方法和涂层模型获得的结果，没有发现金属-模具界面反应，表明样品具有良好的表面光洁度和合理的微观结构。没有涂层的铸造镁支架受到损害，导致样品具有高度反应和杂质。显微镜检查和硬度测量证明了该过程的有效性。