| 摘要 |
PURPOSE:To provide >=97% theoretical density ratio and magnetic characteristics represented by >=5.0MGO (BH)m by mixing easily pulverizable sigma powder or a powdery mixture contg. the powder as the base with iron carbonyl powder and ferrochrome powder to produce a powdery mixture having a specified composition consisting of Fe, Cr and Co and by sintering the mixture. CONSTITUTION:Easily pulverizable sigma powder or a powdery mixture contg. the powder as the base is mixed with iron carbonyl powder and ferrochrome powder to produce a powdery mixture having a composition consisting of 22- 30wt% Cr, 6-15wt% Co and the balance Fe with inevitable impurities. The powdery mixture is press-molded into a prescribed shape and sintered at 1,250- 1,450 deg.C in vacuum or a nonoxidizing atmosphere. An Fe-Cr-Co type sintered magnet alloy is manufactured without using elements which are added to facilitate deoxidation, denitrification and heat treatment. |
