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Neodymium Magnets

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    Negotiable

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    The date of payment from buyers deliver within days

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    Shanghai

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  • Last update:

    2017-12-29 20:38

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    284

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Company Profile

Shanghai Young Magnet Co.,Ltd

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Contact:hsou042(Mr.)  

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Area:Shanghai

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Website:http://www.ndfebmagnet.net/ http://www.jhxyibiao.net/com/hsou042/

Product Details


Professional in producing neodymium magnets, Young Magnet is one of the best manufacturers and suppliers in China. We have quality neodymium magnets for sale. Please feel free to contact us.

NEODYMIUM MAGNET

Young Magnet manufactures neodymium magnet, which also known as NdFeB, NIB or Neo magnet, is the most widely used type of rare-earth magnets. NdFeB magnet is a permanent magnet made from an alloy of neodymium, iron and boron to form the Nd2Fe14B tetragonal crystalline structure. Developed in 1982 by General Motors and Sumitomo Special Metals, neodymium magnets are the strongest type of permanent magnet commercially available. They have replaced other types of magnet in many applications in modern products that require strong permanent magnets, such as motors in cordless tools, hard disk drives and magnetic fasteners. 

We manufactures sintered neodymium magnets in various shapes, such as disc, ring, rectangle, arc, ball and some other special shapes. Not sure if Neo magnet is the best material for your application? Click here for an attribute and application comparison for all of the magnetic materials we offer.

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●Description

●Production Process

●Properties

●Applications

Description

The tetragonal Nd2Fe14B crystal structure has exceptionally high uniaxial magnetocrystalline anisotropy (HA~7 teslas - magnetic field strength H in A/m versus magnetic moment in A.m2). This gives the compound the potential to have high coercivity (i.e., resistance to being demagnetized). The compound also has a high saturation magnetization (Js ~1.6 T or 16 kG) and typically 1.3 teslas. Therefore, as the maximum energy density is proportional to Js2, this magnetic phase has the potential for storing large amounts of magnetic energy (BHmax ~ 512 kJ/m3 or 64 MG·Oe). This property is considerably higher in NdFeB alloys than in samarium cobalt (SmCo) magnets, which were the first type of rare-earth magnet to be commercialized. In practice, the magnetic properties of neodymium magnets depend on the alloy composition, microstructure, and manufacturing technique employed.

Production Process: 

Sintered NdFeB magnets are prepared by the raw materials being melted in a furnace, cast into a mold and cooled to form ingots. The ingots are pulverized and milled; the powder is then sintered into dense blocks. The blocks are then heat-treated, cut to shape, surface treated and magnetized. 

Properties

Neodymium magnets are graded according to their maximum energy product, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets and range from N35 up to N52. And temperature stability could range from M (100℃) to AH ( up to 240℃). 

Grades of Neodymium magnets:


Some important properties used to compare permanent magnets are: remanence (Br), which measures the strength of the magnetic field, coercivity (Hci); the material's resistance to becoming demagnetized, energy product (BHmax), the density of magnetic energy, and Curie temperature (TC), the temperature at which the material loses its magnetism. Neodymium magnets have higher remanence, much higher coercivity and energy product, but often lower Curie temperature than other types. Neodymium is alloyed with terbium and dysprosium in order to preserve its magnetic properties at high temperatures. The table below compares the magnetic performance of neodymium magnets with other types of permanent magnets.

Magnet

Br (T)

Hci (kA/m)

BHmax (kJ/m3)

TC (°C)

TC (°F)

Nd2Fe14B (sintered)

1.0–1.4

750–2000

200–440

310–400

590–752

Nd2Fe14B (bonded)

0.6–0.7

600–1200

60–100

310–400

590–752

SmCo5 (sintered)

0.8–1.1

600–2000

120–200

720

1328

Sm(Co, Fe, Cu, Zr)7 (sintered)

0.9–1.15

450–1300

150–240

800

1472

Alnico (sintered)

0.6–1.4

275

10–88

700–860

1292–1580

Sr-ferrite (sintered)

0.2–0.4

100–300

10–40

450

842

Applications

Neodymium magnets have replaced alnico and ferrite magnets in many of the myriad applications in modern technology where strong permanent magnets are required, because their greater strength allows the use of smaller, lighter magnets for a given application. Some examples are:

► Head actuators for computer hard disks

► Magnetic resonance imaging (MRI)

► Magnetic guitar pickups

► Mechanical e-cigarette firing switches

► Locks for doors

► Loudspeakers and headphones

► Magnetic bearings and couplings

► Benchtop NMR spectrometers

► Electric motors:

●  Cordless tools

●  Servomotors

●  Lifting and compressor motors

●  Synchronous motors

●  Spindle and stepper motors

●  Electrical power steering

●  Drive motors for hybrid and electric vehicles.

(Toyota Prius require 1 kilogram (2.2 pounds) of neodymium.)

●  Actuators

►   Electric generators for wind turbines(only those with permanent magnet excitation)

●  direct-drive wind turbines require c. 600 kg of PM material per megawatt

●  turbines using gears require less PM material per megawatt 

New applications

In addition, the greater strength of neodymium magnets has inspired new applications in areas where magnets were not used before, such as magnetic jewelry clasps, children's magnetic building sets (and other neodymium magnet toys) and as part of the closing mechanism of modern sport parachute equipment. They also are the main metal in the formerly popular desk-toy magnets, "Buckyballs", though some retailers have chosen not to sell them due to child-safety concerns.

The strength and magnetic field homogeneity on neodymium magnets has also opened new applications in the medical field with the introduction of open magnetic resonance imaging (MRI) scanners used to image the body in radiology departments as an alternative to superconducting magnets that use a coil of superconducting wire to produce the magnetic field.]

Neodymium magnets are used as a surgically placed anti-reflux system which is a band of magnets surgically implanted around the lower esophagael sphincter to treat gastroesophageal reflux disease (GERD).

Surface Treatment of NdFeB magnet 

NdFeB magnets are susceptible to corrosion, so it is necessary to give surface treatment Currently, the surface treatments mainly includes chemical plating, conversion coating and coating. In most cases, NdFeB magnet surface are treated with NiCuNi (Nickel-Copper-Nickel) plating, Zinc plating and Epoxy coating. For special requirements, passivation and phosphatization are also adopted. 

In order to quote you the best price, please provide us the following information.

Shape

Block/Rectangle/Square

Disc/Round/Cylinder

Ring/Countersunk

Dimension

L (?) x W(? ) xT(?)

D(?) x T(?)

OD(?) x ID(?) x T(?)

L: length. W: width, T: thickness, D: diameter, OD: outer diameter, ID: inner diameter.

For other shapes, please tell more in details or drawing would be much appreciated.

Coating

Zn, Nickel, Ni-Cu-Ni, Epoxy, Au, Silver or other ?

Working Temperature

Normal or High temperature ?

Package:

Normally packed in small box, and 8 boxes one carton. Some will use vacuum package, for bigger size, will directly pack in carton and use thick spacer to separate.

And for delivery by sea, will use wooden case or pallet to protect 

http://www.ndfebmagnet.net/