- ndfeb manufacturing process
After sintering molding or isostatic pressing green does not have high performance permanent magnet microstructure, in order to further improve the density of powder particles contact between nature, improving strength, microstructure characteristics of magnets with high magnetic performance, need to matrix powder compact heating to a temperature below the melting point of heat treatment.
Sintering furnace should have good sealing, leakage rate is low, so should be airtight vacuum keep regularly in case of gas, water vapor adsorption, avoid by all means make the oven door open after products, long time contact with outside air, and water vapor.
Stripping tank should be closed as well, prevent moisture adsorption, affect product performance.
Sintering sintering process points and limitation of two process, the sintering temperature, the hydrogen left with broken material about between 1050 ℃ ~ 1085 ℃, ingot casting hydrogen about between 1070 ℃ ~ 1095 ℃, ingot casting material between 1100 ℃ ~ 1135 ℃, limitation of secondary aging mechanism of 890 ℃ ~ 920 ℃ and 500 ℃ ~ 630 ℃, 2 from sintering and limitation to come down the whole process typically between 20 to 38 hours.