Towards Closed-Loop Recycling of Ceramic Particle-Reinforced Aluminium Alloys: Comparative Study of Resistance-Heating Sintered Primary and Solid-State Recycled Secondary SiCp/AlSi7Mg Composites

Particle-reinforced aluminium matrix composites (AMC) with a high-volume fraction of ceramic reinforcement (>30 vol.%) combine high specific strength and stiffness good wear resistance thermal stability, resulting in their increasing popularity high-load applications, such as brake discs bearings. It is hence assumed that AMC will accumulate scrap the near future. Appropriate recycling strategies must therefore be developed to maintain AMC’s inherent properties. Melt-metallurgical routes bear danger dissolving liquid metallic contaminating primary melts or forming intermetallic phases secondary melts. Here, solid-state route crushing sintering investigated, wherein all steps are carried out below solidification temperature matrix. A sintered mechanically converted into particulate/powdery raw coarse, medium, milled quality (i.e., d ≈ 7–12 mm, 3–7 < 300 µm) subsequently heating under variation pressure. The two generations analysed discussed regarding microstructure mechanical Since show reduced strength, fracture surfaces analysed, revealing iron contaminations from processing.