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Neodymium Magnet Application

  • Speaker Neodymium MagnetSpeaker magnets are important components in loudspeakers. They can be divided into soft material magnets and hard material magnets. As hard magnets, NdFeB magnets for speakers are expensive, but they have much better performance than common magnets...
  • Relay Neodymium MagnetRelay sintered neodymium magnets are made from the alloy of neodymium, iron, boron and various rare elements (Dy, Al, Nb, Ga, Mo, Co, etc.) in high-heat inert gases environment or in high-heat vacuum condition. As NdFeB magnets for relay, it is widely used in mobile phones...
  • Switch Neodymium MagnetGenerally, switch neodymium magnets must be machined with diamond-grinding techniques. Sometimes, machining operations may be performed on switch magnet materials with carbide tools, but surface finishes for NdFeB magnet switch are not good enough...
  • Sensor Neodymium MagnetSensor neodymium magnets are commonly used in transducers. In modern industry and electronics, sensor magnet helps magnetic transducer to sense magnetic field strength and measure physical parameters like current, position, motion, direction, etc...
  • Packaging Neodymium MagnetNeodymium magnets for packaging are widely used in gift box closure, bottle cap sealing, mobile phone case, etc. Our packaging neodymium magnets have passed various certifications, including ISO9001, ISO14001, GB/T28001 and SGS...
  • Mobile MagnetNeodymium magnets for mobile phones produced by us are in various shapes, such as square, disc, cylinder, arch, ring, etc. Besides, we offer custom mobile magnets according to different requirements from customers. Apart from magnet shapes, we also apply custom surface treatments...
  • Toy Magnet1. With magnetic energy product 10 times larger than ferrites, magnets in toys are featured by great magnetic performance. Majority of toy magnets are neodymium magnets.
    2. It is easy to conduct machining processing NdFeB magnets...
  • Motor MagnetWe can manufacture motor neodymium magnets which are in various shapes, such as disc, cylinder, ring, square, arch, etc. Besides, custom magnets, including NdFeB magnets used in motors, are provided according to customers’ requirements. Our motor NdFeB magnets...

Neodymium magnet is also called NdFeB magnet because it is in Nd2Fe14B tetragonal crystalline structure. According to processing procedures, it is either sintered NdFeB magnet or bonded NdFeB magnet. NdFeB magnet is the strongest type of permanent magnet made so far, it is known as the king of magnets and widely used in various fields. Although NdFeB magnets are always erosion-resistant, the sintered NIB magnets are prone to erosion. So, sintered NIB magnets have a protection cladding on their surface. This protection cladding may be zinc, nickel, nickel copper nickel, environment-friendly zinc, environment-friendly nickel, environment-friendly nickel copper nickel, etc.

Advantages of Neodymium Magnets
1. They are featured by high remanence, large coercivity, large magnetic energy product (10 times larger than ferrites), high cost performance, etc. Besides, it is easy to process these magnets into different shapes and sizes. They are wildly used in aviation field, aerospace field, electronic industry, electrical industry, mechanical industry, instrument manufacturing, etc.
2. Apart from NdFeB magnets in common shapes like square, cylinder, disc, sphere, etc., we also manufacture custom magnets according to special applications. With advanced facilities, our magnets, including sintered NdFeB magnets and bonded NIB magnets, are accurately processed. In terms of micro magnets processing, we have obvious advantages over other manufacturers.
3. Our magnets passed ISO9001, ISO14001, GB/T28001 and SGS.

Application of Neodymium Magnets
<1> Speaker NdFeB Magnet
<2> Relay NdFeB Magnet
<3> Switch NdFeB Magnet
<4> Sensor NdFeB Magnet
<5> Packaging NdFeB Magnet
<6> Mobile NdFeB Magnet
<7> Toy NdFeB Magnet
<8> Motor NdFeB Magnet

Manufacturing Process of Neodymium Magnets
1. Mill the alloy of neodymium, iron, boron and transition metals into NdFeB powder, then compact the powder into desirable shape. Next, sinter the compacted powder and melt it until it becomes a solid metal item. Then, conduct finish machining on the metal item. There are two forms for pressing: die pressing and isostatic pressing.
2. Generally, NdFeB magnets, including sintered NdFeB magnet and bonded NdFeB magnet, have to be grinded with diamond-abrasive techniques. Standard tolerance for NdFeB magnets are +/- 0.1 mm, but it is requested to be higher in some specific applications.

1. Keep neodymium magnets away from people who are using cardiac pacemakers or other medical devices, because magnets may cause malfunction of medical devices, threatening life of these people.
2. Keep NIB magnets away from magnetic recording media and other devices sensitive to magnetism, such as magnetic card, hard disk drive, watch, etc.
3. Clean out magnets during installation, because magnetic chippings may arise when two magnets crash to each other.
4. Take care when using a bulky NdFeB magnet which is of strong magnetism, no matter it is sintered NdFeB magnet or bonded NIB magnet, because it can cause damage to machineries or hurt people.

Physical Properties of Neodymium Magnets

Property Specification
Hardness 570 HV
Resistivity 150 μΩ·cm (10℃-120℃)
Compressive Strength 780 N/mm2
Thermal Expansivity (Vertical to Reference Direction) -4.8 × 10-6 K
Thermal Expansivity (Parallel to Reference Direction) 3.4 × 10-6 K

Size Specifications of Neodymium Magnets

Ring Shape Outer Diameter Inner Diameter Thickness Disc Shape Diameter Thickness
Max. 100.00 mm 80.00 mm 30.00 mm Max. 50.00 mm 20.00 mm
Min. 2.60 mm 1.80 mm 0.50 mm Min. 1.20 mm 0.50 mm
Tolerance +/-0.1 mm +/-0.1 mm +/-0.1 mm Tolerance +/-0.1 mm +/-0.1 mm
Square Shape Length Width Thickness Customized Shapes
Max. 80.00 mm 80.00 mm 30.00 mm
Min. 2.00 mm 1.50 mm 0.50 mm According to Samples or Design Data
Tolerance +/-0.1 mm +/-0.1 mm +/-0.1 mm

Max. Working Temperature of Neodymium Magnets

Type Max. Working Temperature (Pc=1)
N 80 ℃
M 100 ℃
H 120 ℃
SH 150 ℃
UH 180 ℃
EH 200 ℃
TH 250 ℃

Surface Treatment of Neodymium Magnets

Item Specification
Metal Zn, Ni, Ag, Au
Organic Substance Epoxy Resin Spraying, Ni and Epoxy Resin Spraying
  Surface Passivation

Maintenances of Neodymium Magnets
DO NOT place sintered NdFeB magnets and bonded NdFeB magnets in following environments to prevent them from rusting or reducing magnetic performance.
1. Acid or Alkali Liquor
2. Organic Solvent
3. Electrolyte
4. Water or Oil
5. Hydrogen
6. Active Gas like Chlorine, Ammonia, Oxynitride
7. Radiation or Radioactive Rays

Package and Delivery of Neodymium Magnets
1. NIB magnet is packaged in cartons.
2. During transportation, handle the cargo with care. Besides, the cargo should be placed in ventilated, dry, no-erosion environment.