Abstract
Abstract : Hybrid Pr2(Fe,Co)14B/Pr(Co,Fe)5 magnets with nanograin and micrograin structures were studied and synthesized in this project using various processes, including a rapid hot press and hot deformation process, a conventional sintering process, and a rapid induction sintering process. Hybrid Pr2(Fe,Co)14B/ Pr(Co,Fe)5 magnets demonstrated improved long-term thermal stability as compared with those containing no Pr(Co,Fe)5 components. The possibility of applying nanoparticles to synthesize bulk magnets was also explored. A PrCo5 nanopowder was produced by surfactant-assisted high-energy ball milling, and PrCo5 bulk magnets were successfully fabricated by compaction at 200 to approximately 525 degrees C using the nanopowder. The bulk magnet has cluster microstructure with nanocrystalline. The density of the bulk up to 92% theoretical value was obtained.
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