Structure and Magnetic Properties of (Sm,Zr)(Co,Fe,Cu)z Alloy Powders for Bonded Magnets

• Published in: Inorganic materials : applied research Vol. 14; no. 5-6; pp. 1305 - 1311
• Main Authors: Kolchugina, N. B., Dormidontov, N. A., Prokofev, P. A., Milov, Yu. V., Andreenko, A. S., Sipin, I. A., Dormidontov, A. G., Bakulina, A. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2023; Springer Nature B.V
• Subjects: Alloy powders; Bonding; Chemistry; Chemistry and Materials Science; Cobalt; Coercivity; Cooling rate; Copper; General Purpose Materials; Hysteresis loops; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Iron; Magnetic properties; Magnets; Materials Science; Zirconium; Sm–Co magnets; bonded magnets; hysteresis loop squareness; heat treatment; coercive force
• ISSN: 2075-1133; 2075-115X
• DOI: 10.1134/S2075113323050180

Hard magnetic (Sm,Zr)(Co,Fe,Cu) z alloys intended for application as powder fillers in bonded magnets are considered. The microstructure and intrinsic coercive force of Sm 0.87 Zr 0.13 (Co 0.702 Cu 0.088 Fe 0.210 ) 6.7 , Sm 0.81 Zr 0.19 (Co 0.702 Cu 0.088 Fe 0.210 ) 6.3 , and Sm 0.85 Zr 0.15 (Co 0.690 Cu 0.070 Fe 0.240 ) 6.8 alloys, the structural and magnetic states of which are formed at different aging temperatures and cooling rates, are studied. A high coercive force and adequate squareness of the magnetic hysteresis loop of the alloy powders under study are observed at grain and subgrain sizes of the 2 : 17 phase of 10–20 μm. It is shown that the anisotropic powders of the Sm 0.87 Zr 0.13 (Co 0.702 Cu 0.088 Fe 0.210 ) 6.7 alloy can be prepared for manufacturing bonded magnets with a coercive force of 14–20 kOe or higher, which are intended for application in electric machines.