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Sm2Co17 rubber magnet is a kind of bonded magnet and can be produced using by-products obtained in the cutting process of sintered compact after Sm–Co system sintered magnets were made. These rubber magnets are still expensive, but they are effectively used for the sensors requiring a small amount of them. Their magnetic properties largely depend on the interaction between the rubber and the magnetic powder. This article describes the effect of the stearic acid and the compacting pressure on the density and magnetic properties of Sm(Co0.6Cu0.08Fe0.3Zr0.02)8.35 rubber magnets. In the case of 1.5 wt% of stearic acid and 850 MPa of compacting pressure, this article shows that the isotropic rubber magnet is 5.51 g/cm3 in density, 0.34 T in remanence, and 22.99 kJ/m3 in energy product. [ABSTRACT FROM AUTHOR]

In the atmosphere, R2Co17-type SmCo-based magnetic powders (Sm(Co0.6Cu0.08Fe0.3Zr0.02)8.35) a bit different in oxidation process as compared with bulk permanent magnet. This article describes investigation of the oxidation process of Sm(Co0.6Cu0.08Fe0.3Zr0.02)8.35magnetic powders at up to 500 °C through thermogravimetric/differential thermal analysis (TG/DTA) and X-ray diffraction (XRD) technology. The result shows that oxides such as CuO, Co3O4, and CoFe2O4 are firstly formed at 225 °C and then Sm2O3 at 350 °C. At this point activation energy is 47 kJ/mol. [ABSTRACT FROM AUTHOR]