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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 Sm0.87Zr0.13(Co0.702Cu0.088Fe0.210)6.7, Sm0.81Zr0.19(Co0.702Cu0.088Fe0.210)6.3, and Sm0.85Zr0.15(Co0.690Cu0.070Fe0.240)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 Sm0.87Zr0.13(Co0.702Cu0.088Fe0.210)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. [ABSTRACT FROM AUTHOR]

Correlation between the morphology, magnetic properties of powdered (Sm, Zr)(Co, Cu, Fe)z alloy, and magnetic characteristics of magnets made of these powders has been established. Monotonic variations of average particle sizes and density of ready-made magnets as a function of alloy milling time in a planetary mill have been detected; it has been demonstrated that the dependences of the main magnetic properties of magnets on this variable are characterized by an extremum corresponding to the optimum time of powder milling. The interrelation between average particle sizes, their morphology, and magnetic properties of the powder and magnets made of this powder has been analyzed with consideration for the influence of subsequent sintering of initial powders. [ABSTRACT FROM AUTHOR]