| 摘要 |
PURPOSE:To improve the magnetic characteristic of a permanent magnet and to reduce the cost of production by incorporating nitrogen at a specific rate into a permanent magnet consisting of an iron-rare earth element intermetallic compd. CONSTITUTION:An alloy contg. pure iron and one or >=2 kinds among Y, Th and lanthanoid elements at the ratio expressed by the formula (1) is melted in an Ar atmosphere. After the ingot is roughly ground, the powder is subjected to ball mill grinding in an org. solvent to form pulverous powder having about 5mum diameter. The pulverous alloy is treated at about 700 deg.C in the gaseous mixture composed of NH3 and H2 so that N2 is incorporated therein. One or >=2 kinds among Nd, Pr, Ce and La or one kind of Nd and Pr or elements combining both are used as the R in the formula (1). The above-mentioned pulverous alloy powder added with N is molded in a magnetic field and a permanent magnet is produced. The permanent magnet having an excellent magnetic characteristic is easily produced. |
