The sintering temperature significantly changed the microstmcture and effected the power loss behavior at the frequency range over 100kHz. The best power loss characteristics at 100kHz-200mT and 500kHz-50mT were obsemed in the samples sintered at 1300°C and 125OoC, respectively. Those results indicated that the power loss depended on the grain size, electrical resistivity and density of sintered cores. To maintain the stoichiometry at the sintering condition, the fenite cores were processed on the isocomposition lines within the spine1 phase boundary when being cooled. The zinc vapor pressure as well as the oxygen partial pressure was controlled. The high zinc loss condition had an adverse effect on the microstructure of the sintered core surface and degraded the power loss characteristics.
Abstract-~he effects .of si~tering temperature and oxygen partial pressure on the electromagnetic properties of Mn-Zn ferntes were mvestlgated. The grain size increased with increasing sintering temperature. The power loss at 100kHz. dec~eased,. while the power loss at 500kHz increased as the grain size increased with sintering temperaty.re. Smtenng WIth low oxygen partial pressure at 1150°C resulted ih high density and initial penneabl!lty, and. decre~se? the power loss at 100kHz and 500kHz. The oxygen partial pressure lower than 10-2 atm. dunng heatmg, slgmflcantly suppressed the hysteresis loss. However, the oxygen activity did not affect the grain size of the sintered cores.
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