| 摘要 |
PURPOSE:To sharply improve the long-term heat-resisting property of the titled permanent magnet by a method wherein a precipitation hardening R2TM17 type alloy which undergoes an oxidation-preventing surface treatment is used as magnetic powder, and thermoplastic resin polyphenylene sulphite is used as a resin binder. CONSTITUTION:After thermally stable and oxidation-preventing surface processed precipitation hardening R2TM17 type magnetic powder and thermoplastic resin polyphenylene sulphite are heat-molten and kneaded, they are molded in a magnetic field. The resin polyphenylene sulphite has a high melting point of 285 deg.C, and its kneading and molding temperature is 320-340 deg.C. As a result, the above-mentioned TM17 alloy, which has excellent thermal stability and is hardly oxidized, is used. A surface treatment is performed on the TM17 alloy for the purpose of preventing oxidation, and besides, it is desirable that the kneading and molding operation are performed in N2 or inert gas atmosphere in order to suppress the deterioration of efficiency by oxidation. |
