MagTi-Implant - Hybrid implants made of magnesium and titanium using L-PBF

目前，医疗技术中批准的各种材料通过不同的个体部件组合在可植入关节置换中。将镁和钛材料组合在混合型种植体中，可以显著改善种植体的植入行为和寿命等使用性能。然而，由两种不同材料组成的混合植入物到目前为止还不存在。钛镁组合具有很大的应用潜力，钛可以作为组合中的永久基材。镁合金作为一种非永久性材料正逐渐成为人们关注的焦点。与其他可吸收材料相比，这些材料非常适合，因为它们的强度特性与骨相似，此外，由于刺激骨生长，在骨生长过程中，镁部分在人体内溶解，并被新骨取代。此外，可以通过选择合适的合金来调节降解行为的速度。通过结合这两种材料，可以实现永久关节置换，由于外部材料具有良好的附着性能。该研究项目的总体目标是对必须如何设计制造混合型植入物(由镁和钛组成)的概念(设计)和工艺链，以确保在后续应用中的安全行为有一个基本的了解。在未来，添加剂制造将被用于创建患者特定的植入解决方案，该解决方案也将能够处理后续的负载。本项目的目的是研究在L-PBF镁材料加工过程中残余气孔率与工艺参数之间的相互作用。这些基本知识对进一步调查是必不可少的。高的残余孔隙率一方面会改善种植体的向内生长行为，另一方面会降低种植体的机械承载能力。该项目的另一个目标是探索一种在随后的热等静压工艺中通过L-PBF生产的镁和钛试件进行力锁定和材料锁定连接的方法。在简单几何的基础上，正在建立这样一个过程链必须如何设计以实现力和材料闭合的基本理解。

Currently, the various materials approved in medical technology are combined in implantable joint replacements by means of different individual components. The combination of the materials magnesium and titanium within a hybrid implant leads to a significant improvement in the use properties, such as the ingrowth behavior and the longevity. However, a hybrid implant consisting of two different materials does not exist to date. The titanium-magnesium combination represents a great potential for application, whereby titanium can be used as a permanent base material in the combination. As a non-permanent material, magnesium alloys are coming into focus. These are ideally suited due to their similar strength properties to bone compared to other resorbable material alternatives and additionally due to the stimulation of bone growth, whereby during bone growth the magnesium part is dissolved in the human body and replaced by the new bone. In addition, the speed of the degradation behavior can be adjusted by a suitable choice of alloy. By combining the two materials, a permanent joint replacement can be implemented, with good accretion behavior due to the outer material. The global goal of the research project is to develop a basic understanding of how the conception (design) and process chain for manufacturing a hybrid implant (consisting of magnesium and titanium) must be designed in order to ensure safe behavior in the subsequent application. In the future, additive manufacturing will be used to create patient-specific implant solutions that will also be able to handle the subsequent loads. The aim of this project is to investigate the interactions between residual porosity and process parameters in the processing of magnesium materials using L-PBF. Such basic knowledge is essential for further investigations. On the one hand, high residual porosity tends to improve the ingrowth behavior of the implant, while on the other hand it reduces the mechanical load-bearing capacity. A further objective of the project is to investigate a methodology for the force-locked and material-locked joining of magnesium and titanium specimens produced by means of L-PBF in a subsequent HIP process. On the basis of simple geometries, a basic understanding is being created of how such a process chain must be designed in order to achieve both force and material closure.