Abstract
Densification of Sm 2Fe 17N 3 has been performed by hot isostatic press (HIP), using Zn as an additive. Since Sm 2Fe 17N 3 decomposes to SmN and α-Fe at above 600°C, conventional sintering is not applicable. Hipping was mainly performed at 450°C for 30 min under 200 MPa. The addition of Zn powder increased the coercivity of hipped Sm 2Fe 17N 3. On the other hand, the magnetization was decreased by the dilution effect of non-magnetic Zn. The size of the magnet was 9 mm in diameter and 30 mm in length. The relative density was ca. 90%. In order to increase the magnetization, magnetic alignment was performed for Sm 2Fe 17N 3 powder. When the magnetic field was applied normal to the uniaxial pressure in forming process, the ( BH) max of the hipped Sm 2Fe 17N 3 was 168 kJ/m 3 (coercivity: 564 kA/m, remanence: 1.1 T, saturation magnetization: 1.3 T, Zn content: 5 mass%).
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