legering foer permanent a magnet av typ fendb, sintrad permanent a magnet, samt dess framstaellning foerfarande foer.

摘要

The invention relates to the type alloys fe nd b for permanent magnets, the permanent magnets thus obtained and a method of manufacture of those -. & br / & they have high magnetic characteristics with a good temperature resistance and good resistance to atmospheric corrosion. & br / they comprise, in atomic% of 11 to 18% of rare earths, 3 to 30% of co, 5,9 to 12% b, 2 to 10% v, al, cu, the remainder being iron and the inevitable impurities. The v can be substituted by other refractory elements (nb, w, cr, mo, ti, zr, hf, ta). br / the method comprises mainly a sintering between 1050 and 1110degré c, followed by annealing between 850 and 1050degré c and / or tempering between 560degré c and / p 850degré c.