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Metal Injection Molding (MIM) of Magnesium and Its Alloys

机译：镁及其合金的金属注射成型（MIM）

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Current research has highlighted that magnesium and its alloys as biodegradable material are highly suitable for biomedical applications. The new material fully degrades into nontoxic elements and offers material properties matching those of human bone tissue. As biomedical implants are rather small and complex in shape, the metal injection molding (MIM) technique seems to be well suited for the near net shape mass production of such parts. Furthermore, MIM of Mg-alloys is of high interest in further technical fields. This study focusses on the performance of MIM-processing of magnesium alloy powders. It includes Mg-specific development of powder blending, feedstock preparation, injection molding, solvent and thermal debinding and final sintering. Even though Mg is a highly oxygen-affine material forming a stable oxide layer on each particle surface, the material can be sintered to nearly dense parts, providing mechanical properties matching those of as cast material. An ultimate tensile strength of 142 MPa, yield strength of 67 MPa, elastic modulus of 40 GPa and 8% elongation at fracture could be achieved using novel organic polymer binders for the feedstock preparation. Thus, first implant demonstrator parts could be successfully produced by the MIM technique.
机译：当前的研究强调，镁及其合金作为可生物降解的材料非常适合生物医学应用。新材料会完全降解为无毒元素，并提供与人体骨骼组织相匹配的材料特性。由于生物医学植入物的体积很小且形状复杂，因此金属注射成型（MIM）技术似乎非常适合于此类零件的近乎最终形状的批量生产。此外，镁合金的MIM在其他技术领域也引起了极大的兴趣。这项研究的重点是镁合金粉末的MIM加工性能。它包括粉末混合，原料制备，注塑，溶剂和热脱脂以及最终烧结的镁专用开发。即使Mg是在每个粒子表面形成稳定氧化层的高氧亲和力材料，也可以将其烧结成几乎致密的零件，从而提供与铸造材料相匹配的机械性能。使用新型有机聚合物粘合剂制备原料可以实现142 MPa的极限抗拉强度，67 MPa的屈服强度，40 GPa的弹性模量和8％的断裂伸长率。因此，可以通过MIM技术成功地制造出第一植入物演示器部件。

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