This material s currently the strongest type of permanent magnet in the world.
There are three main parameters for magnet.
the remanence Br (unit: Gauss), is the magnetic energy to measure the parameters of the magnetic field strength;
coercivity Hc (unit Oersted ) is a measure of the anti-demagnetization ability parameters;
the BH(max) (unit Gauss-Oersted), is how much of the characterization can store energy in a physical quantity.
NdFeB arc Magnet has high Br,high Hcj,high (BH)max,and high stability,can pick up 660 times of own weight of heavy objects.
The shortcoming is the low of the Curie temperature and the temperature characteristics, easy to rust, oxidation, Sintered NdFeB's surface is usually required for plating such as zinc, nickel, silver, gold, etc., can also be done phosphorus treatment or spray epoxy resin to slow down the oxidation rate.
See the follows Grade H Sintered NdFeB magnetic energy
Grade | Residual Induction | Coercive Force | Intrinsic Coercive Force | Maximum Energy Product | Maximum Operating Temperature | ||||
Br | Hcb | Hcj | (BH)max | Tw | |||||
T | KGS | KA/m | KOe | KA/m | KOe | KJ/m3 | MGOe | ℃ | |
N33H | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥1353 | ≥17 | 247-263 | 31-33 | ≤120 |
N35H | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥1353 | ≥17 | 263-279 | 33-35 | ≤120 |
N38H | 1.22-1.26 | 12.2-12.6 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 287-303 | 36-38 | ≤120 |
N40H | 1.26-1.29 | 12.6-12.9 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 303-318 | 38-40 | ≤120 |
N42H | 1.30-1.33 | 13.0-13.3 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 318-334 | 40-42 | ≤120 |
N44H | 1.33-1.36 | 13.3-13.6 | 907-947 | 11.4-11.9 | ≥1274 | ≥16 | 334-350 | 42-44 | ≤110 |
The main physical properties of sintered Arc NdFeB Magnet
magnetic properties | Parameters |
Density /g.cm3 Vickers Hardness HV Resistivity /υΩ.cm Compressive strength/N.mm-2 Coefficient of Thermal Expansion (C⊥)/K-1 Coefficient of Thermal Expansion (C∥) /K-1 | 7.45 570 150 780 -4.8X10-6 -3.4X10-6 |
compare NdFeB and SmCo:the magnetic properties of rare earth magnet:
item | Js/T | (BH)m /KJ.m-3 | HA /MA.m-1 | Tc/℃ | RE/TM | TM |
Nd2Fe14B | 1.61 | 528 | 6 | 310 | 0.117 | Fe |
SmCo5 | 1.15 | 248 | 32 | 740 | 0.166 | Co |
Sm2Co17 | 1.56 | 480 | 8 | 890 | 0.105 | Co |
NdFeB arc Magnet with its excellent performance, abundant raw material and reasonable price is to be rapid development and wide application.
Also becoming increasingly popular across a wide range of novelty products for markets
APPLICATION:
instrumentation,
electro-acoustic motor,
magnetic magnetization device
micro motors,
electronic industry
NdFeB arc Magnet
NdFeB arc Magnet