Hard Magnetic Materials Vacuum Heat Treatment

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Most of the parts made of hard magnetic alloys are formed by powder metallurgy, and then solution treatment or annealing is performed, so the heat treatment of hard magnetic material work-pieces is mainly vacuum sintering, vacuum solution treatment and vacuum annealing. Due to the strict control of carbon content for NdFeB and AlNiCo alloy materials, molybdenum sheets should be used for hard magnetic alloy parts whether sintering or solution treatment, heating elements and reflective screens of vacuum furnaces.

Hard magnetic alloy parts are punched or extruded in a die after mixing powder and adhesive evenly. During the sintering process, due to the existence of the binder, the workpiece will have a peak of outgassing between 300 and 600 °C, and a second peak of outgassing will appear between 900 and 1000 °C. Therefore, the vacuum furnace used for hard magnetic alloy sintering should be equipped with a diffusion pump with a large pumping speed to avoid oxidation. Hard magnetic alloy parts are punched or extruded in a mold after mixing powder and binder uniformly. During the sintering process, due to the presence of the binder, the workpiece will have a peak of outgassing between 300 and 600 °C, and a second peak of outgassing will appear between 900 and 1000 °C. Therefore, the vacuum furnace used for hard magnetic alloy sintering should be equipped with a diffusion pump with a large pumping speed to avoid oxidation.

After the hard magnetic alloy parts are sintered and formed, some need to be solution-treated to make the material uniform in composition and stable in structure, thereby improving its permanent magnetism. Since the solution treatment has certain requirements on the cooling rate (> 100 ℃/min), the solution treatment can be carried out in a molybdenum sheet-type pressurized gas quenching furnace.

Horizontal vacuum high-pressure gas quenching furnace is mainly used for vacuum gas quenching of tool steel, die steel, high-speed steel, ultra-high-strength steel and other materials.

Hard Magnetic Materials Vacuum Heat Treatment Features:

The furnace body is a horizontal, double-chamber, horizontal charging structure, and the way to open the furnace door is set according to user needs.

The gas quenching chamber is an independent cooling structure, and the heat exchange speed is fast.

The internal material truck is an integral telescopic structure, the material runs smoothly and the time is short.

Axial-flow high-power gas quenching fans or centrifugal high-power gas-quenching fans can be selected for the actual processing parts.

Hard Magnetic Materials Vacuum Heat Treatment Main configuration:

Thermocouple: K-type graduation number, N-type graduation number, S-type graduation number

Recorder: paper recorder, paperless recorder

Human-machine interface: analog screen, computer touch screen

Electrical components: high-quality domestic, Schneider, Siemens

Furnace door opening method: online, offline, vertical lift, rotary

Gas quenching method: vertical airflow cooling, cold airflow left and right blowing cooling

Furnace: graphite heating element and graphite felt composite screen composite structure, molybdenum heating element and all-metal heat shield composite

Vacuum pump set and vacuum gauge: imported, high-quality domestic

Vacuum degree: high vacuum, medium vacuum

PLC: Siemens, Omron, Mitsubishi

Temperature control instrument: Japan Island Electric, British Continental, American Honeywell

Learn more:

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