| 简介 |
PROBLEM TO BE SOLVED : To easily and stably manufacture an Nd2Fe14group sintered magnet having both a high residual magnetic flux density and a coercive force. SOLUTION : The manufacturing method of the rare earth sintered magnet includes a raw material alloy manufacturing process for manufacturing a raw material alloy containing an R (R indicates at least a kind of rare earth elements); a pulverizing process for pulverizing the raw material alloy in one stage or multi-stages to obtain raw material powder; a forming process of forming the raw material powder to obtain a forming; and a sintering process of sintering the forming to obtain the sintered magnet. At least one kind of oxygen rich raw materials (raw material is referred to as the raw material alloy or its pulverized powder) that are manufactured to relatively contain much oxygen contents and one kind of oxygen poor raw materials whose oxygen contents are less than those of the oxygen rich raw materials by 300 ppm (mass ratio) or more are blended before the forming process. COPYRIGHT : (C)2004, JPO |
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