| 摘要 |
PURPOSE:To improve the crushing efficiency, to prevent the sintering and setting of the material while the annealing process, and to give the superior magnetic characteristic to the product, by adding a little amount of the lower monohydric alcohol to the hard ferrite as the crushing assistant, by crushing the ferrite using the mechanical crusher, and by heat treating at the annealing temperature. CONSTITUTION:To lower monohydric alcohol to be employed, is methyl-, ethyl- prophyl alcohol, or a mixture of these alcohols, and generally contains all or a greater part of monohydric alcohols of number of carbon stoms 1-3, and can contain very little amount of other constituents, for instance, the higher aliphatic compound or others. The suitable amount of the crushing assistant is generally about 0.1-10wt% of the hard ferrite material as the base. By further adding the annealing process to the cruhing method, the superior magnetic characteristic can be obtained. The annealing temperature is high enough to be satisfacory for removing the crystalline distortion of the grains, and besides, it is low enough to be preventable the sintering and setting; and the annealing temperature is generally selected from the range 900-1000 deg.C. |
