| 摘要 |
PURPOSE: To provide raw materials for permanent magnet consisting of samari um, iron, boron which are easy to manufacture and excellent in magnetic proper ties, and a method of manufacturing the same. CONSTITUTION: Samarium and boron are diffused on the front surface of acicular iron power which is available by reducing acicular FeOOH crystal with hydrogen. The powder of a low melting point alloy whose melting point is 700 deg.C, which comprises samarium and boron or ferroboron alloy powder is mixed with the acicular FeOOH crystal or if required, cobalt powder or the powder of cobalt and iron alloy are mixed. Under a mixed gas atmosphere of hydrogen and nitrogen, the mixture is heated to 300 deg.C and over and below a melting point of a low melting point alloy, thereby reducing the acicular FeOOH crystal so that it may be turned into acicular iron powder. The powder is continuously heated to temperatures over the melting point of the low melting point alloy and below 1200 deg.C. Then, boron and samarium are diffused on the front layer of the acicular iron powder. After the coating and diffusion, the permanent magnet raw material is manufactured by crushing the product. |
