In situ fabrication of aluminide coatings and rapid prototyping by laser cladding

金属间化合物钌铝化物（B2-RuAl）具有独特的组合性能。据报道，它在室温下具有高的延展性，良好的抗氧化和耐腐蚀性以及高的热稳定性。传统方法加工过程中出现的问题阻碍了RuAl的工业应用。因此，dfg最初建议的目的是评估激光熔覆RuAl的可能性。在第一个项目的背景下，使用元素粉末混合物成功地生产了无裂纹涂层和三维结构。此外，还详细地揭示了它们的相组成。后续项目的首要目标是优化涂层和结构的制造过程，使其更容易转移到工业应用中。因此，粉末混合物应在加工前进行机械合金化。机械合金粉末激光熔覆具有综合元素粉末混合物和预合金粉末优点的潜力。由于过程优化中的迭代过程以及所使用的表征方法在第一个项目中显示出非常成功，因此它们应该在后续项目中保留。其次，应该评估涂层在干燥条件下的摩擦性能和耐磨性，并将其与技术上相关的材料进行比较，因为这些性能是铝化物涂层适用性的关键标准，因为它们尚未经过RuAl测试。

The intermetallic compound ruthenium aluminide (B2-RuAl) possesses a unique combination of properties. It is reported to have high ductility at room temperature, good oxidation and corrosion resistance as well as high thermal stability. The industrial application of RuAl is hindered by problems which arise during processing with conventional methods.It had therefore been the aim of the initial DFG-proposal to evaluate the possibility of laser cladding RuAl . Crack-free Coatings and three-dimensional structures have successfully been produced using elemental powder blends in the context of the first project. Furthermore, their phase compositions have been revealed in detail.It is the first aim of the follow-up project to optimise the manufacturing process for the coatings and structures in a way that they can be more easily transferred to industrial applications. Therefore, the powder mixtures shall be mechanically alloyed before the process. Laser cladding with mechanically alloyed powder has the potential to combine the advantages of the use of elemental powder mixtures and pre-alloyed powder. Since the iterative procedure during process optimisation as well as the used characterisation methods have shown to be very successful during the first project, they should be kept during the follow-up project.Secondly, the friction properties and wear resistance of the coatings under dry conditions should be evaluated and compared to technically relevant materials since these properties are crucial criteria for the applicability of the aluminide coatings and since they have not been tested for RuAl, yet.