Closed Recycling Process for Metal Matrix Composite Materials

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Closed recycling process for low-grade scrap of Al-based composite materials was developed. Flux treatment with water-soluble halide is a key technique in this process. In the present work, flux treatment conditions were discussed from the viewpoints of separation and recovery of base material, reinforcement and flux.The aluminum alloy and the SiC particulate can be recovered separately from the scraping waste of the Al-SiC composite material by using the flux of the NaCl-KCl-KF system. Only small amount of KF is enough to achieve a good result (KF < 1 mass%).The recovered aluminum alloy can be recycled for various usages. Because of the coexistence of Al_2O_3 and K_2NaAlF_6, the recovered SiC particles cannot be reused as reinforcement. It is necessary to eliminate the contamination or to find the other uses. The recovered flux is reusable with supplemental addition of fluoride.Recycling process flow was proposed based on the present result.