Wholesale NdFeB Ring Magnets Price For Sale Maker in China

Neodymium Iron Boron (NdFeB) magnets are widely regarded as some of the strongest permanent magnets available today. Known for their exceptional magnetic properties, they are used in a broad range of applications across industries such as electronics, automotive, energy, and healthcare. One of the common forms of NdFeB magnets is the ring magnet, a versatile shape used in various technical applications.

Classification Based on Magnetic Grade

One of the important ways to classify NdFeB magnets is by their magnetic grade. The grade indicates the strength of the magnet, which is essential when choosing the right magnet for a specific application. The higher the grade, the stronger the magnetic field generated by the magnet.

N35 to N52 Grades

These are the commonly used grades for NdFeB magnets, and the numbers refer to the energy product of the magnet (measured in Mega Gauss Oersteds, or MGOe). For example, an N35 magnet can produce a energy product of 35 MGOe, while an N52 magnet can reach up to 52 MGOe.

N35: Suitable for general industrial applications where moderate magnetic strength is sufficient.

N38-N45: Often used in automotive and home appliance applications, where both size and strength are important.

N50-N52: These are high-performance magnets used in advanced technologies such as electric motors, magnetic resonance imaging (MRI) systems, and certain aerospace applications where power and compact size are required.

Higher Grades:

Higher grades of NdFeB magnets are often referred to as "high-energy" magnets and may be used in specialized applications that demand the possible performance. These grades can exceed N52, such as N55 or N60, which are typically used in industries that require even stronger magnetic fields but still need the magnet to remain compact.

These higher-grade magnets are particularly beneficial in reducing the overall size of electric motors and actuators while still maintaining high torque or force output.

Classification Based on Coatings

NdFeB magnets, while powerful, are also highly prone to corrosion due to their iron content. To address this, various coatings are applied to the magnets to protect them from environmental damage. The coating type not only protects the magnet but can also influence its performance in different conditions.

Nickel-Copper-Nickel (Ni-Cu-Ni)

This is the common coating for NdFeB ring magnets. It provides protection against corrosion and oxidation, making it suitable for indoor applications. The three-layer coating (nickel on both sides with a copper layer in between) creates a durable barrier that resists wear and corrosion.

Zinc (Zn)

Zinc coatings are another popular choice for NdFeB ring magnets, particularly in situations where cost is a concern. Although it does not provide the same level of protection as the Ni-Cu-Ni coating, zinc is still effective for basic protection in relatively dry environments.

Epoxy Coating

Epoxy coatings provide a strong, chemical-resistant barrier and are often used in outdoor or harsh environments, such as in automotive and marine applications. This coating can withstand exposure to chemicals, moisture, and physical abrasion, making it highly suitable for use in rugged applications.

Gold or Silver Coatings

In certain high-end or specialized applications, such as in medical devices or precision instruments, gold or silver coatings may be used. These coatings offer high corrosion resistance and are often employed in medical equipment where biocompatibility and high-performance are critical.

Other Coatings

Other coatings include phosphating, parylene, and rubber coatings. These are selected based on specific environmental conditions, such as high humidity, temperatures, or exposure to acidic conditions.