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Vacuum heat treatment of hard magnetic materials
Time：
Apr 30,2016
Most of the parts made of hard magnetic alloys are formed by powder metallurgy and then solid solution treated or annealed, so the heat treatment of hard magnetic material parts is mainly vacuum sintering, vacuum solution treatment and vacuum annealing. Since the carbon content of NdFeB and AlNiCo alloys needs to be strictly controlled, the heating elements and reflector screens of the vacuum furnace should be made of molybdenum sheets for both sintering and solution treatment of hard magnetic alloy parts.
Cemented carbide parts are formed by stamping or extruding the powder in a die after mixing it with an adhesive. During the sintering process, a peak of outgassing occurs between 300 and 600 °C, and a second peak of outgassing occurs between 900 and 1000 °C due to the presence of the adhesive [ 3 ]. Therefore, the vacuum furnace for sintering hard magnetic alloys should be equipped with a diffusion pump with a large pumping speed to avoid oxidation. Cemented carbide parts are formed by stamping or extruding the powder in a mold after mixing it with an adhesive. During the sintering process, a peak of outgassing occurs between 300 and 600 °C and a second peak of outgassing occurs between 900 and 1000 °C due to the presence of the adhesive [ 3 ]. Therefore, the vacuum furnace for sintering of hard magnetic alloys should be equipped with a diffusion pump with a large pumping speed to avoid oxidation.
After the sintering of the hard magnetic alloy parts, some of them need solid solution treatment to make the material homogeneous in composition and stable in organization, thus improving their permanent magnetism. Since the solid solution treatment has certain requirements on the cooling rate (> 100 ℃/min), the solid solution treatment can be carried out in a molybdenum sheet type pressurized gas quenching furnace.
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