Abstract Scope |
SmCo5 and Sm2Co17 type sintered magnets have been widely used in telecommunication, sensors, power and propulsion applications, especially, at elevated temperatures of 200 - 550 oC. However, while Sm-Co sintered magnets possess excellent magnetic properties, they are brittle and impossible for applications subjected to high stress and vibration. The brittleness also leads to magnet production loss up to 30%. Improving the flexural strength or fracture toughness of Sm-Co magnets is of a great scientific, technical and practical significance.
This presentation will discuss the strengthening strategies of effective enhancement of mechanical strength of the sintered Sm-Co magnets. As a typical case, our work showed that flexural strength values of Sm2(CoFeCuZr)17 sintered magnets were enhanced by up to about 50-100% while the excellent hard magnetic properties were maintained. The formation mechanism of the novel heterogeneous microstructure and its strengthening mechanism in the Sm-Co sintered magnets will be discussed. |