| 摘要 |
PURPOSE:To obtain a magnet wherein N atoms or C atoms have been introduced and its magnetic characteristic is high by a method wherein an R2Fe17 type magnet alloy powder-molded body is sintered and heat-treated in the atmosphere of a mixed gas by N2 gas, NH3 gas and CH4 gas and by exerting a specific gas pressure. CONSTITUTION:A magnet alloy ingot which has been formed by melting, at a high frequency, and casting the composition raw material of an R2Fe17 type magnet is crushed fine and made uniaxially anisotropic. Then, fine powders are oriented in a magneto-static field, pressed, molded and sintered temporarily. After that, this temporarily sintered body is sintered formally and heat-treated in a mixed gas formed of one or two or more kinds out of N2 gas, NH3 gas and CH4 gas at a gas pressure of 10 Pa or higher. At this time, R represents one or two or more kinds of rare-earth elements such as La, Ce, Pr, Nd and the like including Y. Thereby, it is possible to obtain an R2Fe17 type anisotropic bulklike sintered magnet whose cost is low and which is provided with a high magnetic characteristic. |
