| 简介 |
PROBLEM TO BE SOLVED : To prevent the deterioration in magnetic characteristics of a magnetic powder material by heat treatment by reducing the amount of a fluorine compound used. SOLUTION : A rotating machine has : a ferromagnetic material with iron, a rare earth element, and a semimetal element as principal components; a fluorine compound or an acid fluorine compound formed at the inside of the crystal grain of the ferromagnetic material or at one portion of a grain boundary section; at least one of alkali contained by the fluorine compound or the acid fluorine compound, an alkaline earth element, a metal element, and a rare earth element, and carbon or nitrogen; a continuous extension layer, where the fluorine compound or the acid fluorine compound passes through an opposite-side surface through the inside from the surface of the ferromagnetic material; and the sintered magnet in which at least one of the alkali, the alkaline earth element, the metal element, and the rare earth element is deposited one-sidely along the continuous extension layer at a transgranular periphery section along the grain boundary of the ferromagnetic material. COPYRIGHT : (C)2010, JPO&INPIT |
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