Melt spinning process and its effect on the magnetic properties and structures of SM(CO, FE, CU, ZR)

摘要

Sm-Co magnet was attracted attention due to its high Curie temperature and superior comprehensive magnetic properties. Different with powder metallurgy method, melt spinning is another efficient way to prepare Sm-Co magnet. The quenching speed in melt spinning is a critical factor to obtain ribbons with high magnetic properties. Recently, D.Y. Feng et al. reported that intrinsic coercivity of SmCoZr ribbons increases from 1.54kOe to 13.45 kOe with the wheel speed rising from 5 m/s to 60 m/s. And the crystallographic c-axis is parallel to the ribbon plane for the ribbons melt-spun at low speeds of 5 and 15 m/s, and this c-axis orientation is weakened at higher speeds. Tetsuji Saito et al. reported that Fe content has an effect on the phase composition. A small substitution of Fe for Co in the SmCo alloy leads to the formation of the Sm(Co, Fe) phase, but that the large substitution of Fe for Co results in the formation of other phases such as the Sm(Co, Fe) and Sm(Co, Fe) phases. In this paper, the influence of the wheel surface speeds on the thickness of the as-spun Sm-Co ribbons was discussed firstly, and then the magnetic properties and microstructures of the Sm(CoFeCuZr) ribbons with different Fe and Zr contents were investigated.