above picture shows the small wafer NdFeB Magnet with grey expoy coating
NdFeB, (Neodymium Iron Boron magnets Neo magnet), is a type of rare-earth permanent magnet. It is made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. This material is 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.
Neodymium magnet have high Br,high Hcj,high (BH)max,and high stability become the important material of the world.
it has a very high energy product and coercivity, can pick up 660 times of own weight of heavy objects.
Nd-Fe-B permanent magnet is manufactured in a wide range of shapes, sizes and grades according customer's demand.
The advantage is high cost-effective, with good mechanical properties, easy cutting; according customer's demand to manufacture in a wide range of shapes, sizes and grades.
Mostly of rare earth permanent magnet always work do not at room temperature or under vacuum, in order to keep the accuracy of shape size and avoid the Corrosion and oxidation, we must make the coating on the surface. 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.
Sometime, the customers have high demand of NdFeB anti-corrosion, antioxidant, we can design the magnet,add some elements, such as: niobium, vanadium, cobalt and other metal to replace part of the iron to catch the customer requirements of the acid and alkali resistant,antioxidant level, however, because of special material, we need MOQ for it.
Pic show the magnet very small size with very thin thickness, the size is D3.5xH0.7mm.we have excellent machine to control the exactitude size.
And the surface is special coating of expoy in grey color.
See the follows Grade SH Sintered NdFeB magnetic energy parameters
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 | ℃ | |
N30SH | 1.08-1.12 | 10.8-11.2 | 804-844 | 10.1-10.6 | ≥1592 | ≥20 | 223-239 | 28-30 | ≤150 |
N33SH | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥1592 | ≥20 | 247-263 | 31-33 | ≤150 |
N35SH | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥1592 | ≥20 | 263-279 | 33-35 | ≤150 |
N38SH | 1.22-1.26 | 12.2-12.6 | 907-947 | 11.4-11.9 | ≥1592 | ≥20 | 287-303 | 36-38 | ≤150 |
N40SH | 1.26-1.29 | 12.6-12.9 | 907-947 | 11.4-11.9 | ≥1592 | ≥20 | 303-318 | 38-40 | ≤150 |
N42SH | 1.30-1.33 | 13.0-13.3 | 907-947 | 11.4-11.9 | ≥1512 | ≥19 | 318-334 | 40-42 | ≤140 |
The main physical properties of sintered NdFeB
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 |
Nd-Fe-B permanent 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
²APPLICATION:
² instrumentation,
² electro-acoustic motor,
² magnetic magnetization device
²micro motors,
²electronic industry,
²automobile industry,
²petrochemicals,
²nuclear magnetic resonance device,
²sound device magnetic suspension system,
²magnetic transmission machine
²magneto therapy equipment
²high performance motors,
²brushless DC motors,
²generators,
²magnetic separation,
²magnetic resonance imaging,
²sensors
²loudspeakers
²headphones,
²hearing aids,
²voice coil motors,
²magnetic vibrators,
²vibrating motors,
²permanent magnet motors,
²magnetic thrust axis,
²magnetic machinery,
²magnetic spring,
²magnetic vibration device
²magnetic connection,
²magnetic drive,
²Permanent magnet crane
²electromagnetic pumps,
²magnetic separators
²MRI
²magnetic machine
²magnetic equipment
²magnetic water
²magnetic seal
²oil magnetization of paraffin
