Abstract
The effects of the Fe content on the magnetic properties and the microstructures of the Sm(Co0.925-xFexCu0.05Zr0.025)7.74 (x = 0.21–0.31) sintered magnets were investigated. The influence mechanism of the Fe content on the remanence (Br) and intrinsic coercivity (Hcj) of the magnets were studied depending on the comprehensive analysis of the cellular/lamellar structures and the element distribution of the cell and cell wall phases. The incomplete cellular structure, lower Cu content and higher Fe content of the cell wall phases were considered as the main reasons for the low Hcj of the magnet with x = 0.31. The slope of linear increase of the Br of the magnet with x range from 0.27 to 0.31 is lower than that of the magnet with x range from 0.21 to 0.27 indicating a lower Br enhancement efficiency which is mainly caused by the high Fe content of the cell wall phase of the magnet with x > 0.27. A high maximum energy product ((BH)max) of 32.36 MGOe with a Hcj of 34.62 kOe was obtained for the Sm(Co0.655Fe0.27Cu0.05Zr0.025)7.74 magnet.
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