Method for producing a permanent magnet and permanent magnet

A process for manufacturing a nanostructured permanent magnet, comprising the following steps:

• (a) providing a powder comprising particles of a magnetic material,
• (b) coating the powder particles with a diamagnetic or paramagnetic coating material, wherein the mean coating thickness of the coating produced in step of coating the powder particles is 100 nm or less,
• (c) pressing the coated particles into a compact,
• (d) sintering the diamagnetic or paramagnetic coating material at conditions where no sintering of the magnetic material occurs, while transferring the diamagnetic or paramagnetic coating material into a continuous matrix of a diamagnetic or paramagnetic material embedding the particles of the magnetic material, wherein the diamagnetic or paramagnetic matrix material is selected from the group consisting of a glass, a glass ceramic, and a ceramic, wherein the glass and the glass ceramic are based on at least one of SiO2, A12O3 , Na2O, K2O, MgO, CaO, B2O3, TiO2, PbO, and P2O5, and the ceramic comprises at least one of mineral silicate ceramics, non-oxide ceramics, and oxide ceramics based on aluminum oxide or beryllium oxide, and
• (e) magnetizing the magnetic material in an external magnetic field,
• wherein steps (c), (d) and (e) may be carried out in any desired sequential order or simultaneously in any desired combinations.

A process for manufacturing a nanostructured permanent magnet, comprising the following steps:

• (a) providing a powder comprising particles of a magnetic material, wherein the powder has a mean particle diameter in the range of 0.1 to 0.6 μm,
• (b) coating the powder particles with a diamagnetic or paramagnetic coating material,
• (c) pressing the coated particles into a compact,
• (d) sintering the diamagnetic or paramagnetic coating material at conditions where no sintering of the magnetic material occurs, while transferring the diamagnetic or paramagnetic coating material into a continuous matrix of a diamagnetic or paramagnetic material embedding the particles of the magnetic material, wherein the diamagnetic or paramagnetic matrix material is selected from the group consisting of a glass, a glass ceramic, and a ceramic, wherein the glass and the glass ceramic are based on at least one of SiO2, A12O3, Na2O, K2O, MgO, CaO, B2O3, TiO2, PbO, and P2O5, and the ceramic comprises at least one of mineral silicate ceramics, non-oxide ceramics, and oxide ceramics based on aluminum oxide or beryllium oxide, and
• (e) magnetizing the magnetic material in an external magnetic field, wherein steps (c), (d) and (e) may be carried out in any desired sequential order or simultaneously in any desired combinations.