Title :
A high performance magnetic alloy with an operating temperature of 500°C
Author :
Tang, W. ; Zhang, Y. ; Hadjipanayis, G.C.
Author_Institution :
Dept. of Phys. & Astron., Delaware Univ., Newark, DE, USA
fDate :
9/1/2000 12:00:00 AM
Abstract :
A potential high temperature 2:17 magnet with higher Cu content is developed using a simpler aging process. The homogenized Sm(Cobal Fe0.1CuyZr0.04)8.5 magnetic alloy with y=0.168 consists of a mixture of randomly distributed 1:5 precipitates in a disordered 2:17 matrix, which upon aging (3 h at 850°C) transforms to a perfect cellular/lamellar microstructure with right microchemistry associated by a high coercivity of 20 KOe. The short isothermal aging cycle omits the slow cooling stage necessary in traditional magnets. This is helpful in obtaining a better temperature dependence of coercivity. The coercivity of the magnet at 500°C and its temperature coefficient are 6.3 kOe and 0.152 %/°C, respectively. The results of this study are very important both scientifically and technologically and very promising for the future fabrication of high performance and more economical sintered magnets with an operating temperature of 500°C
Keywords :
ageing; cobalt alloys; coercive force; copper alloys; ferromagnetic materials; heat treatment; iron alloys; permanent magnets; samarium alloys; zirconium alloys; 3 h; 500 C; 850 C; Sm(CobalFe0.1CuyZr0.04)8.5; Sm2(CoFeCuZr)17; cellular/lamellar microstructure; high coercivity; high performance magnetic alloy; microchemistry; short isothermal aging cycle; Aging; Coercive force; Cooling; Copper alloys; Fabrication; Iron alloys; Isothermal processes; Microstructure; Temperature dependence; Zirconium;
Journal_Title :
Magnetics, IEEE Transactions on
