Influence of the surface chemistry of Al chips on a friction-induced recycling process for the manufacture of Al wires

该项目的中心目标是研究专门的化学预处理和摩擦诱导回收工艺（RIR）之间的相互作用或用其生产的半成品铝产品（线材）的质量。RIR基于Conform工艺，由于其准静态特性和特定的工具布置，为在上述范围内进行综合和相互依存的化学和技术研究创造了理想的条件。从成型技术的角度来看，必须将原材料（特别是铝屑）及其在挤压通道中的变化作为模型进行表征和描述。RIR的过程和结果可持续地由起始材料的表面形成决定。因此，从化学的角度来看，有必要确定氧化物结构和吸附物与铝合金内部界面形成的相关性，以及将用于有针对性地对碎片进行预处理的界面化学工艺整合到回收工艺中。为了实现总体目标，该项目被划分为各个子目标：·对挤压通道中的工艺进行详细的技术研究，特别是在切屑压实区，包括根据起始材料（铝屑）的类型、尺寸和表面形成进行适当的建模。·单分子功能化，同时控制铝芯片的氧化层厚度·芯片表面化学对生成合金中压力焊接区成分的影响建模·用于化学预处理和无残留物和氧化物芯片的RIR的集成测试台的概念设计和构造·验证集成试验台的功能，并详细描述半成品特性或与化学和成型影响参数的影响和相互作用。

The central objective of the project is to investigate the interactions between a specialized chemical pretreatment and the friction-induced recycling process (RIR) or the quality of the semi-finished aluminum products (wire) produced with it. The RIR is based on the Conform process and, due to its quasi-stationary character and the specific tool arrangement, opens up ideal conditions for combined and interdependent chemical and technological investigations in the above-mentioned context. From the point of view of forming technology, the starting material (in particular aluminum chips) and its changes in the extrusion channel must be characterized and described as a model. The process and the result of the RIR are sustainably determined by the surface formation of the starting material. From a chemical point of view, it is therefore necessary to determine the correlation of the oxide structure and adsorbates with the forming internal interfaces of the aluminum alloy as well as to integrate an interfacial chemical process for the targeted pretreatment of the chips into the recycling process. To achieve the overall objective, the project is divided into individual sub-objectives: • Detailed technological investigation of the processes in the extrusion channel or, in particular, in the chip compaction zone, including suitable modeling depending, among other things, on the type, size and surface formation of the starting material (aluminum chips). • Monomolecular functionalization with simultaneous control of the oxide layer thickness of the aluminum chips • Modeling of the influence of the surface chemistry of the chips on the composition of the pressure weld zones in the generated alloy • Conceptual design and construction of an integrated test rig for the RIR of chemically preconditioned and residue- and oxide-free chips • Verification of the function of the integrated test rig and detailed characterization of the semi-finished product properties or the influences and interactions with the chemical and forming influencing parameters.