| 摘要 |
PURPOSE:To provide a Mn-Zn ferrite of uniform magnetic characteristics without residual hematite or residual pores by sintering ferrite material with reducing agent in an inert atmosphere. CONSTITUTION:Materials for Mn-Zn ferrite, 62-68mol.% Fe2O3, 16-28mol.% MnO, and 10-16mol.% CoO, are mixed in a ball mill and baked in a nitrogen atmosphere. After CaO, SiO2, ZrO2 and CoO are added as additives, all the materials are pulverized in a ball mill. The resulting powder and a reducing agent are mixed at a ratio of 0.05-2.0% by weight in a mortar, and the mixture is compressed into a compact. After heated to 200 deg.C in a nitrogen atmosphere, the compact is sintered at 1200 deg.C in a nitrogen atmosphere containing 0.1% oxygen. This sinter is worked on a hot isostatic press, and then heat-treated. |
