| 摘要 |
<p>The suggested invention gives the basic chemical composition, technological and manufacturing process of preparing ferrite powder as well as its sintering process for producing soft-magnetic power Mn-Zn ferrites applicable for frequency ranges between 300 kHz and 1.5 MHz. The main features of the invention are its basic chemical compositions (Fe2O3 : MnO : ZnO), combination of small quantity supplementary components (CaO : TiO2 : SnO2), mixing, pelletization, calcination, two-stage mixing in an atrittoric mill, drying in a spray-dryer and corresponding adjusted atmospheric and temperature sintering conditions. The described process ensures lower magnetic losses and higher saturation densities compared to currently known soft-magentic power Mn - Zn ferrite materials. The final electromagnetic features of toroid cores are defined by the ratio between basic components of oxidising materials and corresponding temperature and atmospheric sintering conditions.</p> |
