| 摘要 |
PURPOSE:To produce a permanent magnet having excellent density and magnetic characteristics in the stage of producing a permanent magnet by sintering the powder of an intermetallic compd. of rare earth elements and Co by changing over a sintering atmosphere plural times to a vacuum or inert gaseous atmosphere. CONSTITUTION:An intermetallic compd. consisting of rare earth elements such as Sm and Co as raw material for magnets is pulverized down to about 3mu. After the powder is compression molded to moldings in a magnetic field, the moldings are heated in a vacuum atmosphere until the sintering temp. of the moldings is attained. During the time until solutionization is finished, the atmosphere is subjected to plural times of cycles like substitution with gaseous Ar-evacuation-substitution with gaseous Ar. According to this method, the magnet of a rare earths-Co intermetallic compd. having density higher than 95% theoretical density and having excellent magnetic characteristics is obtained. |
