| 摘要 |
PURPOSE:To prevent a rare earth element alloy from being contaminated with oxygen and carbon during crushing by occluding hydrogen to the rare earth element alloy of a stock, and crushing the rare earth element alloy which has occluded the hydrogen in hydrogen atmosphere or in inert gas atmosphere of argon or the like. CONSTITUTION:To crush a rare earth element alloy, hydrogen is occluded in advance to the rare earth element alloy, and the alloy which has occluded the hydrogen is crushed at once in the form of fine powder in hydrogen gas or inert gas atmosphere in one vessel without externally removing the alloy which has occluded the hydrogen on the way. The rare earth element alloy fine powder which has occluded the hydrogen or the rare earth element alloy fine powder which has dehydrogenated is formed and sintered as stock powder to manufacture the sintered rare earth element magnet. Since the rare earth element alloy is effectively prevented from being contaminated with the oxygen or carbon until the rare earth element alloy becomes a magnet and fine powder containing regular particle size is prepared in crushing step, the magnet having excellent magnetic properties can be formed. The hydrogen occluded into the rare earth element alloy is discharged to activate particles of the rare earth element alloy fine powder, thereby enhancing sintering and molding properties of the fine powder.
|
