| 摘要 |
PURPOSE: A method for preparation of sintered permanent magnets is provided to exhibit an excellent magnetic property through potential characteristics of a crystalline mother alloy for permanent magnet containing a rare-earth element such as, Fe and B, as the essential components. CONSTITUTION: First, a method for preparation of sintered permanent magnets fully mixes fine powder of a crystalline mother alloy for permanent magnet containing a rare-earth element, such as Fe and B, as the essential components with fine powder of zinc oxide, and compacts and molds the resulted mixture in the presence of a magnetic field. Then, the compacted mixture is sintered in vacuum to cause generation of oxygen and metallic zinc by thermal decomposition of the zinc oxide, and a part of metallic component is segregated in the mother alloy at the boundary and inside of the mother alloy crystal. Simultaneously, amorphous metallic oxide is formed by forced oxidation of the segregated metal with the generated oxygen and is crystallized. Thereafter, an epitaxial junction is formed between the crystallized metallic oxide and the mother alloy crystal, and evaporation of the metallic zinc into the vacuum and quenching the sintered compact are executed.
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