| 摘要 |
PURPOSE:To improve characteristics of magnetic alloy by making an alloy powder that consists of specified amounts of R (yttrium and rare earth elements), Fe, Cu, Zr and Co and forming the powder under pressure and sintering the formed powder. CONSTITUTION:By the method to form by powder metallurgy a magnetic alloy that belongs to the group of R2T17 (R represents yttrium and rare earth and T a transition metal) an alloy powder is made with 22.5-27.5wt% of R, 15.0- 23.0wt% of Fe, 3.3-5.0wt% of Cu, 1.5-3.5wt% of Zr, and balance of Co. This alloy powder is formed under pressure, and after sintering it at 1,170-1,230 deg.C it is subject to solid solution treatment at 1,130-1,200 deg.C. After this heat treatment at the same temperature as the sintering temperature and heat treatment at the same temperature as the solid solution treatment temperature are repeated. After this the product is held at 600-950 deg.C for 0.2-30hr, and then it is cooled under 500 deg.C with the cooling speed in the range of 0.05-5 deg.C/min. |
