Neodymium Magnet

Some functions of Neodymium magnets

Neodymium cube magnets are small, powerful magnets made from a rare earth metal called neodymium. They are typically small in size, ranging from a few millimeters to a few centimeters in length, width, and height, and are often square or rectangular. Neodymium cube magnets are particularly useful for creating 3D magnetic structures or as building blocks for larger magnetic assemblies. They can be stacked and arranged in different configurations to create custom shapes and structures, and their strong magnetic force allows them to securely hold objects in place.

Neodymium Disc/Cylinder Magnets With Countersunk Holes

Strong Neodymium Disc/Cylinder Magnets With Countersunk Holes are best for securely attaching magnets to both magnetic and non-magnetic surfaces. Neodymium disc/cylinder magnets with countersunk holes are small, cylindrical magnets that have a depression on one or both faces, creating a conical-shaped recess. The magnets are typically made from a rare earth metal called neodymium and are known for their strong magnetic properties, making them popular for a variety of applications where a strong magnetic force is required. The countersunk holes on the magnets allow them to be easily fastened to a surface using screws, making them useful for creating magnetic closures, clasps, and fasteners. They can also be used in a variety of industrial and engineering applications, such as motors, generators, and sensors. Neodymium disc/cylinder magnets with countersunk holes come in a range of sizes and strengths, and their strength is usually indicated by their grade. Higher-grade magnets have a stronger magnetic field and are capable of lifting heavier weights.
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Neodymium Disc/Cylinder Magnets With Countersunk Holes Features and Benefits

Strong Magnetic Force:  Like all neodymium magnets, these disc or cylinder magnets offer a high magnetic strength, making them suitable for various holding, mounting, and closure applications where a strong, permanent magnetic field is required.

Countersunk Hole: The countersunk hole is designed to accommodate a standard flat-head screw, ensuring the magnet can be securely fastened to non-magnetic surfaces without requiring additional adhesive or mounting methods. This feature allows the magnet’s face to be flush with the mounted surface, providing a clean and seamless appearance.

Versatile Applications: These magnets are widely used in woodworking, cabinetry, DIY projects, retail displays, and as closures for doors, gates, and fixtures. They are also utilized in sensor mounting, robotics, and various industrial applications where a strong, detachable magnetic connection is needed.

Durability: The magnets are typically coated with materials such as nickel, zinc, or epoxy to prevent corrosion and wear, enhancing their durability and lifespan in various environments.

Neodymium Disc/Cylinder Magnets With Countersunk Holes Handling and Safety

Careful Handling: Due to their strong magnetic force, these magnets should be handled with care to avoid injuries from pinching or sudden attraction to metal objects.

Secure Mounting: It’s important to ensure that the screws used fit the countersunk hole properly and that the magnet is mounted on a stable, secure surface to prevent detachment or shifting under load.

Keep Away from Sensitive Devices:? The powerful magnetic field can affect electronic devices, magnetic storage media, and medical devices. Keep the magnets at a safe distance from such items.

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The precise combination of neodymium, iron, and boron influence the magnet’s remanence coercivity and energy product. This is as well as the grain size and crystallographic orientation.
The specific application requirements and design considerations, like magnetic field strength and operating temperature determine the suitable NdFeB magnet grade.
The geometry of the neo-magnet (shape and size) affects its magnetic performance. Magnets with irregular shapes, thin sections, and small sizes exhibit reduced magnetic properties.
Neodymium magnets can be made from sintering, hot-pressing, or bonded molding influencing their final properties. Each of this processes results in variations in the magnet’s properties.
NIB magnets are brittle and susceptible to mechanical stress. As a result, excessive application of such can lead to failure affecting the magnet’s integrity and performance.
Conditions in the operating environment such as temperature, humidity,
and external magnetic fields, can impact a magnet’s performance.
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Information Of Our Neodymium Magnet.

What is a neodymium magnet?

A neodymium magnet is a type of rare-earth magnet that is made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. It is the strongest type of permanent magnet commercially available.

How strong are neodymium magnets?

Neodymium magnets are extremely strong for their size. They can lift thousands of times their own weight. The exact strength depends on the grade of the magnet, which can vary based on the manufacturing process.

What are the grades of neodymium magnets?

Neodymium magnets come in different grades, such as N35, N42, N52, etc. These grades indicate the strength of the magnet. The higher the number, the stronger the magnet. Grades may also include letters after the number indicating temperature resistance.

Can neodymium magnets be demagnetized?

Yes, like all permanent magnets, neodymium magnets can be demagnetized if exposed to high temperatures (above their Curie temperature), strong demagnetizing magnetic fields, or if they are physically damaged.

Are neodymium magnets dangerous?

Neodymium magnets can be dangerous if not handled properly due to their strong magnetic force. They can snap together with great speed, potentially causing injuries or damaging the magnets. Small magnets also pose a swallowing hazard, which can be life-threatening.

How do I separate two neodymium magnets?

Separating neodymium magnets, especially strong ones, can be challenging. It's often recommended to slide them apart rather than trying to pull them directly apart. Using a piece of plastic or wood as a lever can also help. Always wear protective gloves to avoid pinching.

Information of our neodymium ARC Magnet

What are neodymium arc magnets?

Neodymium arc magnets are a type of rare-earth magnet made from an alloy of neodymium, iron, and boron, shaped in the form of an arc or segment. These magnets are designed to fit the round shape of motors and generators, providing a powerful magnetic field in a specific direction.Alnico channel bar magnets are composed of an Alnico magnet (made from an alloy of Aluminum, Nickel, and Cobalt, and often including Copper and sometimes Titanium) seated within a metal channel. This channel acts to direct the magnet’s field, increasing its strength on the open side of the channel.

How do neodymium arc magnets differ from other neodymium magnets?

The main difference lies in their shape. While neodymium magnets can come in various forms, such as discs, blocks, or cubes, arc magnets are specifically cut into arc shapes to fit circular assemblies. This shape allows them to generate a directional magnetic field around the circumference of a circle, making them ideal for rotational applications.

How strong are neodymium arc magnets?

Neodymium arc magnets are among the strongest types of magnets available, capable of generating significant magnetic force. The strength of an arc magnet depends on its grade, size, and the design of the magnetic circuit in which it is used.

Are neodymium arc magnets coated?

Like other neodymium magnets, arc magnets are typically coated to prevent corrosion. The coatings can include nickel, copper, zinc, or epoxy, which protect the magnet from moisture and chemical exposure.

Do neodymium arc magnets have a specific magnetic orientation?

Yes, neodymium arc magnets are manufactured with a specific magnetic orientation that is aligned with the arc’s geometry. This orientation is crucial for their use in motors and generators, where the magnetic field needs to interact precisely with the device’s other components.

How should neodymium arc magnets be handled?

Handling neodymium arc magnets requires caution due to their strong magnetic force. Protective gloves should be worn to prevent injuries, and the magnets should be kept at a safe distance from electronic devices and magnetic storage media to avoid damage.

Can neodymium arc magnets lose their magnetism?

Neodymium arc magnets can lose their magnetism if exposed to high temperatures, strong demagnetizing magnetic fields, or if they are physically damaged. However, under normal operating conditions, they can maintain their magnetism for decades.

How are neodymium arc magnets manufactured?

The manufacturing process for neodymium arc magnets involves melting the raw materials (neodymium, iron, and boron), casting the alloy into ingots, pulverizing the ingots into a fine powder, pressing the powder in a magnetic field to align the particles, sintering to fuse the particles, and then cutting the magnets into the desired arc shape before coating them for protection.

Neodymium Plate ,
Block Magnets With Countersunk Holes

Neodymium plate or block magnets with countersunk holes offer a powerful and versatile solution for a wide range of applications. Made from Neodymium, the most powerful magnet material available, these magnets provide unparalleled strength for their size. The addition of countersunk holes allows for easy mounting with screws, making them ideal for both industrial applications and DIY projects where a flush attachment is needed.

Neodymium Plate, Block Magnets With Countersunk Holes
Features and Benefits

High Magnetic Strength: Neodymium is the strongest magnet material available, enabling these magnets to hold an impressive amount of weight relative to their size. This makes them ideal for various applications, from industrial manufacturing to home DIY projects.

Versatile Mounting Options: The countersunk holes provide a convenient and secure method to mount these magnets flush to a surface using standard flat-head screws. This feature allows for easy integration into designs and practical everyday applications.

Compact and Durable: Despite their powerful magnetic force, these magnets have a compact form factor. They are also coated with a protective layer, usually nickel, to prevent corrosion and wear, ensuring longevity and durability in various environments.

Wide Range of Applications: Suitable for both commercial and personal use, these magnets can be used in manufacturing, workshops, crafts, home improvement projects, and more. They are perfect for creating closures, mounting tools or decorations, and organizing spaces efficiently.

Neodymium Plate, Block Magnets With Countersunk
Holes Handling and Safety

Handle with care to avoid personal injury or damage to the magnets. Neodymium magnets are very strong and can snap together with great force.
Use caution when mounting the magnets to avoid pinching fingers or causing the magnets to shatter by colliding with a hard surface.

Keep away from children. Small magnets pose a choking hazard and can be dangerous if ingested. People with pacemakers or other medical devices should consult a physician before using neodymium magnets, as the strong magnetic fields may interfere with electronic medical devices. Avoid placing neodymium magnets near electronic devices, credit cards, magnetic media, and other items that can be damaged by strong magnetic fields.
Store in a dry, cool place to preserve the magnet’s strength and protective coating. Use spacers to keep magnets separated and prevent them from snapping together. When not in use, store magnets with a steel keeper or in pairs with their north and south poles aligned to reduce the risk of demagnetization.

Our Some Neodymium Magnets

Neodymium cube magnets

Neodymium cube magnets are small, powerful magnets made from a rare earth metal called neodymium. They are typically small in size, ranging from a few millimeters to a few centimeters in length, width, and height, and are often square or rectangular. Neodymium cube magnets are particularly useful for creating 3D magnetic structures or as building blocks for larger magnetic assemblies. They can be stacked and arranged in different configurations to create custom shapes and structures, and their strong magnetic force allows them to securely hold objects in place.

Neodymium Bar Magnet

These types of Neo magnets possess all the unique properties and advantages of neodymium magnets and in the form of rectangular bars or blocks.
They come in different sizes strong magnetic fields running along the length of the bar, providing a concentrated magnetic flux.
The magnetic strength is highest at the poles and decreases towards the center. Neo bar magnets are used in various applications, like magnetic closures for doors and cabinets, sensors and magnetic switches.

Neodymium Magnet Balls

Neodymium magnet balls are small spherical magnets made from neodymium rare earth material. These tiny powerful magnets have gained popularity as desk toys, stress relievers, and creative building tools. These magnets can feature different diameters with the most common around 5mm to 6mm. It finds common use as a creative play tool used to make various geometric shapes, sculptures, and patterns. Small NIB magnet balls however pose potential hazards if ingested especially by children.

Neodymium Ring Magnets

Neodymium ring magnets have a circular shape with a hole in the center, creating a ring-like structure. These magnets are available in different outer diameters, inner diameters, and thicknesses to meet specific application requirements. The magnetic field of NdFeB ring magnets is concentrated on the outer and inner surfaces and weaker around the center hole. This unique design offers makes them suitable for specific applications like magnetic couplings in mechanical systems.

Neodymium Sphere Magnets

Neodymium sphere magnets have a round shape and are available in various sizes, ranging from a few millimeters. They have a strong magnetic pull, despite their shape and can be used for building magnetic sculptures and stress relief. Neodymium sphere magnets can be coated with other materials for aesthetic purpose as well as corrosion protection. Their shape is a potential hazard through swallowing and should be kept away from small kids and pets.

Neodymium Disc Magnet

These are circular magnets with a flat, circular surface on both sides available in different diameters and thicknesses. Neodymium disc magnets have a high energy product, and can generate strong magnetic fields relative to their size. You find their use in electric motors and generators, magnetic sensors and switches and magnetic bearings and couplings. You can customize these magnets to suit your specific application requirements.

Sintered NdFeB Magnets

These are the most common type of NIB magnets produced via a powder metallurgy process. Powders of neodymium, iron, and boron are mixed, compacted under high pressure, and then sintered at high temperatures. Sintered rare earth magnets exhibit high energy product, good mechanical strength and excellent magnetic properties. They can be formed in different shapes and sizes and are ideal for high-performance applications like motors and generators.

Bonded Neodymium Magnets

The manufacture of bonded NdFeB magnets involves mixing NdFeB powder with a polymer binder like epoxy resin or nylon. Injection molding or compression technique is then used to mold the homogenous mixture into the desired shape. Unlike sintered magnets, bonded magnets exhibit lower magnetic properties but with advantages like flexibility and low production cost. They find use where complex shapes or tight dimensional tolerances are required.

Other Features of Neodymium Magnets

Flexural Strength of Neodymium Magnet :

Flexural strength is a mechanical property that measures a material’s ability to resist deformation when subjected to bending forces. Neodymium rare earth magnets are made from a brittle material, and thus have relatively low flexural strength. Therefore, subjecting neodymium magnets to bending or flexural stresses is likely to result in cracking or breaking.

Remanence of Neodymium Magnet :

Upon subjecting a ferromagnetic material to a magnetic field presence, it retains some magnetic flux density. This remnant density inherent now to the material describes its remanence. A neodymium magnet’s remanence describes the magnetic field it possesses after magnetization.

For neodymium magnets, remanence dictates overall magnetic strength and performance and is expressed in Tesla (T) or Gauss (G). Since NIB magnets are considered the most powerful, it suffices that their remanence value is high.

The remanence of neodymium magnets varies with grades, with higher-grade magnets having higher remanence values. The higher the remanence value, the stronger the magnetic field that the neodymium magnet can maintain.

Corrosion of Neodymium Magnet :

Corrosion is a chemical process that results in material deterioration from reacting with environmental elements. Neodymium magnets constitute a mixture of neodymium, iron, and boron powders. They are thus susceptible to corrosion thanks to their iron content.

When exposed to moisture or humidity the iron in the magnets can oxidize, leading to the formation of rust. Consequently, manufacturers apply coatings such as nickel, zinc and epoxy to the NIB magnet’s surface for corrosion protection.

These coatings act as a barrier between the neodymium magnet and the surrounding environment, preventing direct contact with moisture and oxygen. The coating choice is influenced by the specific application and the likely environmental conditions.

Temperature Sensitivity of Neodymium Magnet :

Temperature sensitivity of NdFeB magnets refers to how their magnetic properties are affected by changes in temperature. These permanent magnets are known to be sensitive to temperature variations with significant influence on their magnetic performance.

The Curie temperature of neodymium magnets provides a threshold beyond which they undergo a phase transition to a paramagnetic state. These magnets also exhibit reversible changes in magnetic properties within their operating temperature range.

In this case, their magnetic strength can decrease with increasing temperature and increase with decreasing temperature. This reversible change is referred to as the temperature coefficient of remanence expressed as a percentage per degree Celsius.

Additionally, the resistance to demagnetization of neodymium magnets (coercivity) can also be temperature-dependent. Here, you find higher temperatures can reduce coercivity, making the magnet more susceptible to demagnetization.

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Neodymium Magnets Manufacturing Process

The manufacture of Neo magnets involves several steps, from preparation of raw materials to the magnetizing process.
The primary method used for the manufacture of neodymium magnets is the sintering process which may vary depending on desired grade.

Here’s an overview of the sintering process:

Preparation of the Raw Materials

Preparation of raw materials for neodymium magnets involves careful control of chemical composition and powder characteristics. This ensures the production of high-quality magnets with consistent and reliable magnetic properties.

This step involves obtaining and processing the essential elements of neodymium, iron and boron form their respective oxides. Neodymium oxide (Nd2O3) is the primary source of neodymium derived from rare earth mineral deposits like bastnäsite or monazite.

Iron oxide (Fe2O3) is the source of iron readily obtained from natural sources like hematite, magnetite, or deposits of iron ore. Boron oxide (B2O3) is used to extract boron and is found in boron minerals or in the form of borax.

The individual oxides are weighed and mixed in precise stoichiometric ratios based on the desired magnet composition. The correct mixture ensures neodymium-iron-boron (NdFeB) crystalline phases formation during the sintering process, responsible for its strong magnetic properties.

Neodymium Ring Magnets

Neodymium ring magnets have a circular shape with a hole in the center, creating a ring-like structure. These magnets are available in different outer diameters, inner diameters, and thicknesses to meet specific application requirements. The magnetic field of NdFeB ring magnets is concentrated on the outer and inner surfaces and weaker around the center hole. This unique design offers makes them suitable for specific applications like magnetic couplings in mechanical systems.

Grinding and Homogenization

The mixed oxides are then finely ground to achieve a homogeneous and uniform powder. This step is crucial to ensure consistent magnetic and mechanical properties in the final neodymium rare earth magnet. An additional step called hydrogen decrepitation can be employed to improve the powder’s homogeneity and magnetic properties. Here, the mixed powders are hydrogenated before being rapidly cooled to room temperature instigating a decrepitation process.

Sintering

Sintering involves heating the green magnet at high temperatures to fuse the particles together creating a dense and solid magnet. The green magnets are placed in a sintering furnace on trays or fixtures to ensure even heating. The furnace is heated to temperatures around 1000°C to 1100°C or higher depending on the specific composition and desired properties. This is done for a specific dwell time, allowing for the necessary particle bonding and densification. Sintering can be performed in a vacuum or controlled atmosphere with nitrogen or argon, to prevent oxidation of the magnet materials. A controlled atmosphere helps maintain the desired composition and prevents formation of unwanted phases that could hamper magnetic properties. After the sintering cycle is complete, the furnace is gradually cooled down to room temperature. Slow cooling helps prevent thermal stresses that could lead to cracking or deformation of the magnets.

Pressing

The pressing process involves compacting the neodymium magnet powder into the desired shape and size before sintering. This process creates the “green” magnet, a fragile and porous preform that undergoes further transformation during sintering. A die made of rigid material, and designed to create the desired magnet shape is used in the pressing process. The die cavity typically corresponds to the final shape of the magnet. Dry pressing is commonly employed for compacting neodymium magnet powder. Here, the powder is poured into the die cavity before a punch exerts pressure on the powder compressing it. Dry pressing can be uniaxial or isostatic. Uniaxial pressing applies pressure in one direction whereas isostatic pressing uniformly applies pressure from all directions. Isostatic pressing is preferred for more complex shapes or when higher uniformity in density is required. The compacted magnet powder in the shape of the desired magnet is referred to as the “green” .

Annealing

The annealing process improves the magnetic properties of NIB magnets further optimizing their microstructure. Annealing is a heat treatment process that subjects the magnets to high temperatures followed by controlled cooling. The sintered magnets are placed in a furnace, where temperature is raised to the annealing temperature, typically below the Curie temperature. The magnets are held at this temperature for a given time allowing the structure to undergo recrystallization and homogenization. Thereafter, the furnace is gradually cooled down with precise control to prevent thermal shocks and ensure uniform cooling. The annealing process promotes grain growth, resulting in larger and more uniform crystalline grains which can improve magnetic properties.

Machining and Surface Treatment

The machining process and surface treatment help achieve the final desired shape, size, and surface characteristics of the magnets. The neodymium magnets while in their final magnetized form may not have the exact desired shape or dimensions. As such, they are first cut and grinded. Drilling may be necessary for round or ring-shaped magnets or to accommodate mounting screws or other components. In machining, precision machining is crucial to meet tight tolerances required in certain applications. Surface polishing or lapping is carried out to eliminate rough or uneven surfaces and achieve a smoother finish. Since neodymium rare earth magnets are susceptible to corrosion, they are subjected to surface coating using materials like nickel and epoxy.