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Vacuum heat treatment of hard magnetic materials

Most parts made of hard magnetic alloys are formed by powder metallurgy and then treated by solid solution or annealing. So the heat treatment of hard magnetic materials is mainly vacuum sintering, vacuum solid solution treatment and vacuum annealing. As the carbon content of Nd-Fe-B and Al-Ni-Co alloy materials needs to be strictly controlled, molybdenum sheets should be used in the production of hard magnetic alloy parts, such as sintering, solid solution treatment, heating elements of vacuum furnace and reflecting screen.

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Hard magnetic alloy parts are stamped or extruded in the die after mixing powder and adhesive evenly. In the sintering process, due to the existence of adhesives, there will be a peak of deflation in the workpiece between 300 and 600 C, and a second peak of deflation in the workpiece between 900 and 1000 C. Therefore, the vacuum furnace for sintering hard magnetic alloys should be equipped with a larger pumping speed diffusion pump to avoid oxidation. Hard magnetic alloy parts are stamped or extruded in the die after mixing powder and adhesive evenly. In the sintering process, due to the existence of adhesives, there will be a peak of deflation in the workpiece between 300 and 600 C, and a second peak of deflation in the workpiece between 900 and 1000 C. Therefore, the vacuum furnace for sintering hard magnetic alloys should be equipped with a larger pumping speed diffusion pump to avoid oxidation.


After sintering and forming of hard magnetic alloy parts, some of them need solid solution treatment, so that the composition of the material is uniform and the structure is stable, so as to improve its permanent magnetism. Because solid solution treatment has certain requirement for cooling rate (> 100 C/min), molybdenum sheet pressure gas quenching furnace can be used for solid solution treatment.


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