Abstract
Bulk Sm 2Fe 17N x sintering magnet was fabricated by spark plasma sintering(SPS) technique. The effects of sintering pressure and sintering temperature on the magnetic properties of the Sm 2Fe 17N x magnet were investigated. As a result, the density of the magnet is obviously improved with the increase of sintering pressure, but the coercivity drops since Sm 2Fe 17N x has decomposed into SmN, α-Fe and N 2. When sintering temperature was only above 200 °C under 1 GPa sintering pressure, the coercivity even begins to decrease, which indicates that high pressure promotes the decomposition of the Sm 2Fe 17N x at lower temperature. The decomposition is also proved by the decrease of nitrogen and increase of α-Fe in the magnets.
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