Dense strontium hexaferrite-based permanent magnet composites assisted by cold sintering process

The use of rare-earth-based permanent magnets is one the critical points for development current technology. On hand, industry rare-earths highly polluting due to negative environmental impact their extraction and, on other sector potentially dependent China. Therefore, investigation required both in rare-earth-free and sintering processes that enable greener fabrication with attractive magnetic properties at a more competitive price. This work presents cold process (CSP) followed by post-annealing 1100 °C as new way sinter composite based strontium ferrite (SFO). Composites incorporate percentage ? 10% an additional phase have been prepared morphological, structural evaluated after each stage process. CSP induces transformation SFO composites, which partially recovered post-thermal treatment improving relative density 92% response final coercivity up 3.0 kOe. Control possible through composition grain size sintered magnets. These results show potential approach alternative develop modern • First dense assisted during manufacturing route response. Highly reached lower temperatures energy efficiency around 29%.