METHOD FOR THE PRODUCTION OF PERMANENT MAGNETS USING A SUPERCRITICAL FLUID SUCH AS SUPERCRITICAL CO2

摘要

The invention relates to a method for producing a permanent magnet based on a ferromagnetic powder, comprising the following steps: coating the powder grains with a first polymer that is soluble in a supercritical fluid; mixing the thus coated grains with a second polymer that is not soluble in the supercritical fluid; shaping the mixture; exposing the shaped mixture to the supercritical fluid; applying a magnetic field to the shaped mixture that has been exposed to the supercritical fluid; stopping exposure to the supercritical fluid.