Abstract
The microstructure, domain structure and magnetic properties of the sintered RECoCuFeZr magnets produced by using hydrogen decrepitation (HD), sintering in hydrogen-containing atmosphere and hot isostatic pressing (HIP) processes have been investigated. The applications of these operations are shown to have a positive effect on the magnetic properties and magnet homogeneity. The following magnetic properties have been obtained for the Sm 0.7Gd 0.1Er 0.2(Co 0.683Cu 0.083Fe 0.210Zr 0.024) 7.35 magnets: remanence (Br) = 1.07 T; intrisic coercivity (iHc) = 1610 kA/m; maximum energy product (BHmax) = 215 kJ/m 3. It is demonstrated that Gd- and Er- alloy magnets are less resistant to failure if operating in the hydrogen atmosphere.
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