PROCESS FOR PRODUCING ANISOTROPIC MAGNET POWDER

文件类型：PDF文档
文件大小：1267K
A process for producing anisotropic magnet powder, comprising the high temperature hydrogenation step of retaining an RFeB alloy composed mainly of Y-containing rare earth elements (R), B and Fe in treating atmosphere involving the first treating pressure (P1) ranging in hydrogen partial pressure from 10 to 100 kPa and the first treating temperature (T1) ranging from 953 to 1133 K; the structure stabilization step of retaining the RFeB alloy after the high temperature hydrogenation step in treating atmosphere involving the second treating pressure (P2) of 10 kPa or higher in hydrogen partial pressure and the second treating temperature (T2) ranging from 1033 to 1213 K wherein T2>T1 and P2>P1; the controlled evacuation step of retaining the RFeB alloy after the structure stabilization step in treating atmosphere involving the third treating pressure (P3) ranging in hydrogen partial pressure from 0.1 to 10 kPa and the third treating temperature (T3) ranging from 1033 to 1213 K; and the forced evacuation step of removing remaining hydrogen (H) from the RFeB alloy after the controlled evacuation step. This process enhances the magnetic performance of the anisotropic magnet powder. © KIPO & WIPO 2007