Fabrication of Amorphous Powder Perticles by Spinning Water Atomization Process (SWAP), and Development of Compressed Powder Magnetic Cores

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Fe-based amorphous powder particles were fabricated by the spinning water atomization process (SWAP), recently developed by the authors. The powders obtained exhibited good soft-magnetic properties up to particle sizes of about 200-300mum. These amorphous particles were insulated by glass fine powder and pressed into toroidal and E shape cores by hot-pressing techniques at relatively high temperature conditions below crystallization temperature. The mass densities of the pressed cores were about 80-85%. The magnetic properties of toroidal samples 20-30 mm in diameter were measured after annealing. For the core pressed at 1.5GPa, 450-480ﾟC,the initial permeability was about 100 in the frequency range up to 1 MHz for H_m=5mOe, which were comparable to those of commercial Sendust compressed cores and Fe-based gapped amorphous ribbon cores for application to fly-back transformers or choking coils operating at frequencies above 100kHz. The core losses at 100kHz were 6-7 [J/m^3] (=0.6-0.7 [W/cc] ) for B_m=0.1T.These values were 50-70% of those of above commercial cores.