Bonded NdFeB Magnets Manufacturer
We manufacture custom bonded NdFeB magnets for motors, sensors, encoder systems, robotics, and industrial automation applications. Our bonded neodymium magnets combine flexible shape design, multi-pole magnetization capability, dimensional precision, and cost-efficient mass production for global OEM projects.
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Bonded Ring NdFeb Magnets achieve highest form tolerances, making a further shaping process unnecessary. During manufacturing, general tolerance levels are kept to ±0.05 mm. The -
Bonded Ring Neodymium Magnets are manufactured through the compression process. This process involves mixing neodymium powder with epoxy as a binder and pressing it into a die
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Bonded Block NdFeb Magnets are made of the powerful Nd-Fe-B material mixed into an epoxy binder. The mix is appropriately 97 vol% magnet material to 3 vol% epoxy. The
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Compression Bonded Block Neodymium Magnets are ideal for applications requiring tight tolerances and high magnetic strength. They are isotropic – so they may be magnetized in any
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The size of the bonded magnets is high and the secondary processing is no longer required.Magnet surface by resin coating or nickel plating, can effectively improve its corrosion
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Professional in producing bonded arc ndfeb magnets, Young Magnet is one of the best manufacturers and suppliers in China. We have quality bonded arc ndfeb magnets for sale. Please
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Professional in producing bonded neodymium magnets, Young Magnet is one of the best manufacturers and suppliers in China. We have quality bonded neodymium magnets for sale. Please
Corrosion Environment and Mechanism of Bonded Ndfeb Magnets
Warm and humid air/air currents
NdFeB magnets are susceptible to rusting in warm and humid air, with very thin rust patches appearing on the surface.
Electrochemical environment
In an electrochemical environment, NdFeB magnets are susceptible to corrosion, resulting in weakened magnetic properties.
Prolonged high temperature environment (greater than 250°C)
In a high temperature environment, neodymium, a rare earth element in NdFeB magnets, is easily oxidised, leading to changes in the structure of the magnet and intergranular corrosion.
Typology of Bonded NdFeB Magnets
The two main types of bonded NdFeB magnets are compression moulded and injection moulded.
Compression moulding
Compression moulding is a common method of manufacturing bonded NdFeB magnets. In this process, NdFeB magnetic powder and binder are mixed and then pressed into the desired shape using a press. The pressed and moulded magnets have high dimensional accuracy and complex shape design capability, and are suitable for magnetic components that require high precision and complex shapes.
Injection moulding
Injection moulding is another common manufacturing method for bonded NdFeB magnets. This process is similar to plastic injection moulding, where the magnetic powder and binder are mixed and injected into a mould, and then cured by heating and pressure. Injection moulded magnets also offer high dimensional accuracy and complex shape design capabilities, making them suitable for magnetic components that require high precision and complex shapes.
Surface Coating
Surface coating of magnetic powder to form a dense antioxidant layer. Commonly used processes include silane coupling coating, potassium dichromate reduction and potassium dichromate reduction-silane coating. In the coating process, the choice of solvent is also very important as the solubility of the coupling agent in the solvent directly affects the magnetic properties of the magnet.
Electroplating
Electroplating is a commonly used protection method, especially for amorphous materials, whose mechanical properties, magnetic properties and corrosion resistance are better than those of crystalline materials. Electroplating is simple, inexpensive and easy to control.
Chemical Plating
Chemical plating is suitable for porous and complex shaped materials, among which chemical plating Ni-P alloy coating has high hardness, corrosion resistance and wear resistance, which can provide the best protection.
Some Physical Properties of Bonded NdFeB Magnets
| Parameter | Unit | Value |
| Density (ρ) | g/cm3 | 4.5-6.5 |
| Curie Temperature (Tc) | ºC | 300-350 |
| Recoil Permeability (μrec) | - | 1.2 |
| Rockwell Hardness (HR) | MPa | 35-45 |
| Compressive Strenght (σbc) | MPa | 800-1000 |
| Tensile Strength (σb) | MPa | 200 |
| Thermal Expansivity (α) | 10-6/ºC | 1/2 |
Maintenance of Bonded NdFeB Magnets
Surface Coating
Surface coating of magnetic powder to form a dense antioxidant layer. Commonly used processes include silane coupling coating, potassium dichromate reduction and potassium dichromate reduction-silane coating. In the coating process, the choice of solvent is also very important as the solubility of the coupling agent in the solvent directly affects the magnetic properties of the magnet.
Electroplating
Electroplating is a commonly used protection method, especially for amorphous materials, whose mechanical properties, magnetic properties and corrosion resistance are better than those of crystalline materials. Electroplating is simple, inexpensive and easy to control.
Chemical Plating
Chemical plating is suitable for porous and complex shaped materials, among which chemical plating Ni-P alloy coating has high hardness, corrosion resistance and wear resistance, which can provide the best protection.
Bonded NdFeB Magnets’ Grades and Their Magnetic Properties
| Grade | Br | Hcb | Hcj | (BH)max | Tw | ||||
| kGs | T | kOe | kA/m | kOe | kA/m | MGOe | kJ/m3 | °C | |
| HGT-12 | 7.0-7.6 | 0.70-0.76 | 5.5-6.5 | 438-517 | 8/11 | 637-875 | 10.0-11.0 | 80-88 | ≤160 |
| HGT-11 | 6.7-7.3 | 0.67-0.73 | 5.3-6.0 | 422-478 | 8/11 | 637-875 | 9.8-10.5 | 78-84 | ≤160 |
| HGT-10H | 6.2-6.8 | 0.62-0.68 | 5.4-6.0 | 430-478 | 11/14 | 875-1115 | 8.8-9.5 | 70-76 | ≤180 |
| HGT-10 | 6.5-7.1 | 0.65-0.71 | 5.2-6.0 | 414-478 | 8/10 | 637-796 | 9.0-9.7 | 72-77 | ≤160 |
| HGT-9 | 6.3-6.9 | 0.63-0.69 | 5.0-5.8 | 398-462 | 8/10 | 637-796 | 8.6-9.3 | 68-74 | ≤160 |
| HGT-8H | 6.0-6.6 | 0.60-0.66 | 4.8-5.8 | 382-462 | 10/13 | 796-1035 | 7.5-8.5 | 60-68 | ≤180 |
| HGT-8 | 6.2-6.8 | 0.62-0.68 | 5.0-5.8 | 398-462 | 8/10 | 637-796 | 7.8-8.8 | 62-70 | ≤160 |
| HGT-7 | 5.8-6.5 | 0.58-0.65 | 4.4-5.2 | 350-414 | 6/9 | 478-716 | 7.0-8.0 | 56-64 | ≤160 |
| HGT-6 | 5.3-6.0 | 0.53-0.60 | 3.7-4.6 | 295-366 | 6/9 | 478-716 | 5.9-6.8 | 47-54 | ≤160 |
| HGT-5 | 4.8-5.5 | 0.48-0.55 | 3.2-4.0 | 255-318 | 5/8 | 398-637 | 4.8-5.5 | 38-44 | ≤160 |
| HGT-4 | 4.2-5.0 | 0.42-0.50 | 2.8-3.6 | 223-287 | 5/8 | 398-637 | 3.5-4.5 | 28-36 | ≤160 |
| HGT-3 | 3.5-4.3 | 0.35-0.43 | 2.4-3.3 | 191-263 | 5/8 | 398-637 | 2.6-3.6 | 21-29 | ≤160 |
| HGT-2 | 3.0-3.8 | 0.30-0.38 | 2.0-3.2 | 159-255 | 5/8 | 398-637 | 1.9-3.0 | 15-24 | ≤160 |
FAQ
As one of the most professional bonded ndfeb magnets manufacturers and suppliers in China, we're featured by quality products and good service. Please feel free to buy bonded ndfeb magnets for sale here from our factory.
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