| 摘要 |
PURPOSE:To obtain manterials of a permanent magnet having high orientation characteristics by obtaining rough particles of specified grain size by spraying an alloy of specified composition from the solved condition by gas atomization and forming particles of 30mum or smaller through heat processing and a milling process. CONSTITUTION:A composition alloy of a permanent magnet is defined by R(T1-yMy)z, where, R is one or two kinds or more of rare earth metals including y, T is a transition metal mainly composed of Fe, or Fe and Co, M is a metalloid element mainly composed of B, and y and z are defined as 0.02<=y<=0.15, 5<= z<=9. This alloy is sprayed by inactive gas atomization from its solved condition to form rough particles of 50-1000 mum. Next, such rough partlces are subjected to heat processing in a vacuum or inactive ambience. Moreover, the particles of 30 mum or smaller are formed by a mechanical milling method. A magnet is formed of compressed power by compression and orientation characteristic of permanent magnet can be improved. |
