D6 x 20 / S20 - SmCo (samarium-cobalt) magnet
- External diameter
- 6 [mm] +0,1/-0,1
- 20 [mm] +0,1/-0,1
- magnetizing direction along dimension
- 20 [mm]
- maximal hoisting capacity
- 0,9 [kg]
- Magnetic field in geometrical center of the magnetic pole surface
- 0,351 [T]
- Maximum working temperature
- 250 °[C]
- Magnetic moment
- 520,98 [nWb]x[m]
- 4,48 [g]
Magnetic properties of material grade S20
|remanence Br||0,850 - 0,980 [T]|
|coercivity HcB||min. 597 [kA/m]|
|coercivity HcJ||min. 1273 [kA/m]|
|energy product (BH)max||143 - 175 [kJ/m3]|
|Magnetic properties of a particular material, together with its shape, volume, max. working temperature and direction of magnetization have influence on practical magnetic properties of a magnet.|
|As an example, you will find attached a graph of a course of the II quadrant of magnetic hysteresis loop for a material grade S20.|
|Vickers' hardness (HV)||~450 - 500[kg/mm2]|
|resistivity||~ 0,00005 [uOhm x cm]|
SmCo (samarium-cobalt) magnets with dimensions and material parameters defined by Clients are available on commission. Please send inquiries to our E-mail address.
Magnetic properties of material grade S20: remanence Br 0,850-0,980 [T], coercivity HcB min. 597 [kA/m], coercivity HcJ min. 1273 [kA/m], energy product (BH)max 143-175 [kJ/m3] (Magnetic properties of a particular material, together with its shape, volume, max. working temperature and direction of magnetization have influence on practical magnetic properties of a magnet.)
Physical proprieties: density ~8,0 [g/cm3], Vickersâ€™ hardness (HV) ~450-500 [kG/mm2], resistivity ~0,00005 [Ohm x cm]
Max. working temperature is no more than 250Â°[C]. (For flat magnets and magnets mounted in the open magnetic circuit working temperature may be insignificantly lower. For high magnets and magnets mounted in the closed magnetic circuit working temperature equals max. working temperature for a given material.) Curieâ€™s temperature is ~ 700Â°[C]. Temperature coefficient of remanence TK(Br): approx. -0,05 %/Â°[C]. Temperature coefficient of coercivity TK(HcJ): approx. -0,3 %/Â°[C].
Direction of magnetization along the height means that one circular surface of a magnet makes the N-pole, while the other â€“ opposite â€“ circular surface refers to the S-pole.
Magnetic flux: ~4570 x 10-3 [mWb], for K(Helmholtz coil constant) = 1,14 Ã— 10-4[m]
Magnetic moment: ~4570 x 10-3 [mWb] Ã— 1,14 Ã— 10-4[m] = ~520,98 x 10-6 [mWb] Ã— [m]
Magnetic field in geometrical center of surface of the magnetic pole, with a distance of 0,7 [mm] is ~0,351 [T]
Pull force: ~0,9 [kg]. The pull force was measured by using smooth metal sheet 10 [mm] thick, acting with perpendicular detaching force. The air gap comprised between the metal sheet and a magnet causes reduction in the pull force.Â
All the numbers quoted were obtained as a result of tests with one specific item in a room temperature and are intended to serve for comparison of practical magnetic properties of magnets offered by the shop.
Above temperature of 250Â°[C] susceptibility to oxidation of a SmCo magnet raises dramatically.
Sintered SmCo magnets are brittle (fragile). A SmCo magnet without housing could break after an impact with another strong magnet.
Weight of the magnet: ~4,5 [g]
We recommend testing of a magnet sample in specific conditions.
As an example, you will find attached a graph of a course of the II quadrant of magnetic hysteresis loop for a material grade S20