Patent ID: 6143193
Filing Date: 2000-11-07
Classification: H01F

Abstract:
A rare earth bonded magnet produced from a rare earth magnetic composition comprising a rare earth magnet powder, a thermoplastic resin and a chelating agent for preventing oxidation of said rare earth magnet powder and said thermoplastic resin by extrusion molding, wherein the content of the rare earth magnet powder in the rare earth bonded magnet ranges from 78.1 to 83 percent by volume and said rare earth bonded magnet has a void ratio of 2 percent by volume or less thereby yielding a high magnetic energy product having excellent fluidity during extrusion molding such that a variety of different shaped and sized magnets may be formed, said rare earth magnet powder selected from the group consisting of:a first composition comprising (1) R wherein R is at least one rare earth element including Y, (2) transition metals including Fe as the main ingredient, and (3) B; anda second composition comprising rare earth elements containing Sm as the main ingredient, transition metals including Fe as the main ingredient, and interstitial elements containing N as the main ingredient.