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Neodymium Magnet – Frequently Asked Questions

Step into the world of neodymium magnets with a collection of FAQs. Whether you’re a magnet enthusiast or simply curious, this article provides insightful answers to questions about their strength, grading, and the precautions necessary.

neodymium sphere magnets

What is a Neodymium Magnet?

These magnets are made from a special recipe, combining three main ingredients: neodymium, iron, and boron. Neodymium brings strength; iron adds the familiar magnetism we know, and boron keeps everything stable.

At the microscopic level, neodymium magnets are comprised of countless atoms, each behaving like a tiny magnet with its north and south poles. Ordinarily, these atomic magnets point in random directions, resulting in a cancellation of their magnetic effects. During the manufacturing process, a special treatment is applied, aligning these atomic magnets in a coordinated dance.

Neodymium, a rare-earth element, steps into the spotlight as the magnetic powerhouse. Its unique properties exert a strong influence on atomic alignment, compelling the atoms to orient themselves in the same direction. This dominant influence of neodymium amplifies the overall magnetic effect within the material.

To maintain the order established by neodymium, boron enters the equation as a stabilizing force. As a vital component of the neodymium magnet alloy (NdFeB), boron prevents the atomic magnets from reverting to their chaotic orientation. This collaboration creates a stable and powerful magnetic field.

They’re all around us! From the magnets in your headphones and fridge doors to the motors in electric cars, neodymium magnets play a crucial role in modern technology.

How Strong Is A Neodymium Magnet?

Neodymium magnets typically have magnetic flux densities ranging from 1.3 Tesla (13,000 Gauss) to 1.6 Tesla (16,000 Gauss).
Specialty and high-performance neodymium magnets can exceed these values.
N-Grade Classification:

Small neodymium magnets (e.g., 10mm diameter) might have pull forces of around 5 kg (50 N), while larger ones (e.g., 50mm diameter) can exceed 100 kg (1,000 N).

Magnetic closures in consumer electronics often use small neodymium magnets with pull forces ranging from a few grams to several kilograms.

Industrial magnetic assemblies, like magnetic lifters, can utilize neodymium magnets with pull forces exceeding 1,000 kg (10,000 N) or more.

permanent magnet rotor assembly

What is the Difference Between N35, N42, N50 and N52 Neodymium Magnets?

As the grade increases, the BHmax also increases, signifying a stronger magnetic field. Higher grades generally come with a higher cost due to the superior magnetic properties.

N35 Neodymium Magnets:
Maximum Energy Product (BHmax): Approximately 33 to 36 Mega-Gauss-Oersteds (MGOe)
Common Applications: Low-strength applications, educational projects, crafts.

N42 Neodymium Magnets:
Maximum Energy Product (BHmax): Approximately 40 to 43 MGOe
Common Applications: General-purpose use, magnetic closures, sensors.

N50 Neodymium Magnets:
Maximum Energy Product (BHmax): Approximately 47 to 50 MGOe
Common Applications: Motors, magnetic couplings, industrial applications.

N52 Neodymium Magnets:
Maximum Energy Product (BHmax): 49 MGOe and above (can reach up to 53 MGOe)
Common Applications: High-performance motors, magnetic separators, advanced industrial applications.

How are Neodymium Magnets Made?

The manufacturing of neodymium magnets is a complex and precise process, blending metallurgy, thermal treatment, and machining treatment.

Raw Material Extraction: Neodymium, iron, and boron are extracted from mineral deposits, forming the basis of the magnet.

Alloy Formation: These elements are alloyed to create the neodymium-iron-boron (NdFeB) alloy, defining the magnet’s properties.

Melting and Milling: The alloy undergoes high-temperature melting and milling, creating a fine powder for further processing.

Pressing: The powder is pressed into the desired shape, forming a “green compact” for subsequent steps.

Sintering: Sintering at high temperatures fuses the compacted particles, optimizing magnetic properties.
Machining and Shaping: Precision machining shapes the magnet to meet specific design requirements.

Coating: Coating with materials like nickel protects against corrosion, ensuring longevity.
Magnetization: Powerful magnetic fields during magnetization activate its potent strength.

Inspection and Quality Control: Stringent checks verify dimensions, coating integrity, and magnetic strength.

Application Integration: Crafted magnets find applications in motors, generators, electronics, medical devices, and more.

 

nano coating neodymium magnet

Can Neodymium Magnets Be Customized in Shape and Size?

Yes, manufacturers offer customization options for neodymium magnets. They can be produced in diverse shapes such as discs, blocks, cylinders, and rings to meet specific design requirements for different applications. Custom sizes are also available to suit the needs of various industries.

At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects.

We value personalization and take pride in providing neodymium magnets that meet the needs of various clients.

How Can I Protect Neodymium Magnets from Corrosion?

Protecting neodymium magnets from corrosion is crucial to ensure their long-term performance and durability. Neodymium magnets are prone to corrosion because they contain iron, which can rust when exposed to moisture. Here are several methods to protect neodymium magnets from corrosion:

Nickel Plating: Nickel is a common coating for neodymium magnets. It provides a protective layer that helps prevent corrosion. Most standard neodymium magnets come with a nickel coating.

Zinc Plating: Zinc is another option for plating neodymium magnets. It offers good corrosion resistance and can be an alternative to nickel.

Epoxy Coating: Applying an epoxy resin coating provides an additional layer of protection against moisture and corrosion. Epoxy coatings are particularly useful in applications where the magnet may be exposed to harsh environmental conditions.

Triple Coating: Some neodymium magnets come with a triple coating of nickel-copper-nickel. This triple-layered coating enhances corrosion resistance and provides a more robust protection compared to a single layer.

Gold or Silver Plating: Gold and silver plating not only offer corrosion resistance but also add aesthetic appeal. These coatings are commonly used in decorative or high-end applications.

Use in Enclosures: Placing neodymium magnets inside sealed enclosures or housings protects them from direct exposure to moisture and corrosive elements.

Keep Dry: Ensure that neodymium magnets are kept dry. Store them in a cool, dry place away from humid or corrosive environments.

Avoid Extreme Conditions: Neodymium magnets may experience accelerated corrosion in extreme conditions. Avoid exposing them to high temperatures, humidity, or corrosive chemicals.

Regular Inspection: Periodically inspect neodymium magnets for any signs of corrosion or damage. Replace or recoat magnets as needed to maintain their protective layers.

neodymium disc magnets

Are Neodymium Magnets Safe?

Neodymium magnets are generally safe for common applications, but it’s essential to handle them with care and be aware of potential risks.

Pinching Hazard: Neodymium magnets are incredibly strong and can exert a powerful force. There is a risk of pinching or trapping fingers between magnets or between a magnet and a metal surface. Exercise caution when handling them, especially large or strong magnets.

Impact Hazard: Neodymium magnets can break or chip upon impact, creating sharp edges. Broken magnets may also release small magnetic fragments. Always handle magnets carefully to prevent damage.

Interference with Electronics: Strong magnetic fields produced by neodymium magnets can interfere with electronic devices such as pacemakers, credit cards, and hard drives. Keep magnets away from sensitive electronic equipment.

Swallowing Hazard: Small magnets are a choking hazard, and if swallowed, they can pose serious health risks. Keep magnets away from small children, and if multiple magnets or a large magnet is swallowed, seek medical attention immediately.

Are Neodymium Magnets Recyclable?

Yes, neodymium magnets are recyclable. The materials used in their composition, including neodymium, iron, and boron, can be reclaimed and reused in the manufacturing process. Recycling contributes to sustainability and reduces the demand for newly mined raw materials. The technological advancements include:

Urban mining, the process of extracting valuable elements from existing products, presents a promising avenue for neodymium magnet recycling. Disposing of electronics containing neodymium magnets in landfills limits the potential for resource recovery.

Ongoing research and technological advancements are exploring more efficient methods for recycling rare earth magnets. Innovations in hydrometallurgical and pyrometallurgical processes aim to enhance extraction efficiency.

 

 

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Jonah Jin

Jonah Jin
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