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2J9 is a kind of cobalt-iron-vanadium deformable hysteresis alloy which is suitable for making magnetic hysteresis motor rotor, hysteresis brake. Similar alloy's names in different standards:
Beiye designation | China Standard designation | America designation | Japan designation | Germany designation | International designation |
2J9 | FeCoVCr4/1 | FeCoVCr7/1 |
Magnetic hysteresis motor rotor
Magnetic hysteresis brake
C | 0.1 | Ni | 0.5 |
Si | 0.5 | Co | 51.0 |
Mn | 0.5 | V | 9.0 |
Fe | bal. |
Magnetic field strength at the maximum permeability Hμ | 8.75-11.94KA/m |
Magnetic flux density at the maximum permeability Bμ | 0.9-1.25T |
The hysteresis loss Pμ | ≥22.0（KJm3） |
Bulging coefficient Kμ | ≥0.95 |
* Typical values measured on rings sample after annealed at 580°C in pure & dry Hydrogen and then tempered.
Young Modulus | 180 000MPa |
* Typical values for material tested in accordance with GB/T 4340.3, GB/T 228, GB/T 22315.
Density | 8.1 g/cm3 |
Curie temperature | 860℃ |
Thermal expansion(20~300℃) | 10.6×10-6/℃ |
Resistivity | 65µΩ•cm |
Final annealing: For maximum magnetic properties, the cold deformed 2J9 alloy should be annealed in an oxygen-free, dry hydrogen atmosphere with a dew point below -40℃ at 580℃ for 25 minutes. Vacuum heat treatment could be used.
Oil, grease, lacquer and all other contaminants must be removed before annealing. The individual parts should be separated by an inert insulating powder such as magnesium and aluminum oxide during hydrogen annealing.
