Optimisation of 2/17 permanent magnets using the quinary Sm-Co-Cu-Fe-Zr phase diagram

摘要

The combination of high magnetisation and high Curie temperature of the Sm2Co17 type magnets makes them attractive for a number of applications requiring high-energy products and long term stability for continuous operating up to 300 degrees C. In order to optimise the elaboration process, it was necessary to investigate phase equilibria in the Sm-Co-Zr-Cu-Fe system. The presented part of the work concerns two regions of interest near 1150 degrees C and 850 degrees C. A specific method is proposed to represent the diagram where a two dimension projection of the different domains is coupled with a three dimensional one. This representation appears as a tool to understand the metallurgical process and to obtain better reproducibility of the alloys magnetic properties. Then an optimisation could be made. Magnetic behaviour of alloys is discussed. (C) 1998 Elsevier Science S.A. [References: 15]