Sm
2Fe
17N
x has been hipped to realize the excellent magnetic properties; high Curie temperature, strong uniaxial anisotropy and high saturation magnetization. Sm
2Fe
17N
x decomposes to SmN and α-Fe at above 600°C. Sintering of Sm
2Fe
17N
x is impossible under atmosphere pressure. In this study, HIP sintering and magnetic properties of Sm
2Fe
17N
3 have been studied in terms of the possibility of practical use as a permanent magnetic material. Milled powder of Sm
2Fe
17N
3 was charged into an aluminum capsule applying uniaxial pressure of 50MPa in nitrogen atmosphere. The hipped Sm
2Fe
17N
3 having 92% of relative density was obtained at 450°C under 200 MPa without decomposition. The relative density obtained was larger than those of bonded magnets. Magnetic field of 4.14 MA/m (52 kOe) was applied to orientate the powder in the capsule. Giving an orientation to the specimen, the maximum magnetic properties were obtained as follows; remanent magnetization: 0.96T (9.6kG), and (BH)
max: 118 kJ/m
3 (14.8MGOe).
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