| 摘要 |
PURPOSE:To increase molding density and control and adjust contraction rates by either mixing calcinated powders processed under differing calcination conditions at a specified ratio before crushing or mixing after crushing. CONSTITUTION:After mixing the main elements of soft ferrite, oxides and carbonates or other compounds, at a specified ratio, the calcination process is performed under multiple, different temperature conditions. For example, when a powder calcinated at 850 deg.C is mixed with a powder calcinated at 950 deg.C in different ratios and minutely moisture crushed to particles with an average diameter of 1.0-1.2mum, a toroidal is formed, and sintering is performed at 1350 deg.C, the sintered core density is nearly uniform. With this method, it is possible to obtain materials with different contraction rates and thus to improve contraction rates by varying the ratios of the mixture. This effect can also be obtained by mixing at a set ratio after crushing a sintered material processed under different conditions. |
