Product Overview
This is a large u-shaped magnet, featuring extremely high magnetic strength, excellent demagnetization resistance, and precise dimensional accuracy. The product's precision can be customized according to customer requirements. Its sophisticated ring-shaped design meets high-performance magnetic needs in compact spaces, making it widely applicable in high-end electronic devices, audio equipment, premium perfume bottle caps, and other fields.
The magnet is manufactured using advanced wire cutting, center-less grinding, and double-disc grinding processes, ensuring neat edges and uniform dimensions. Surface treatment includes multi-layer metal coating (Ni+Cu+Ni) or optional Ni coating, effectively preventing oxidation and corrosion from environmental factors, thereby extending the product's service life.
Technical Specifications
|
Product Name |
large u-shaped magnets |
|
Material Grade |
N42 (Br ≥ 14.2 kGs, Hcj ≥ 12 kOe) |
|
Dimension |
Customize |
|
Dimensional Tolerance |
±0.05 mm (length/width/thickness) |
|
Operating Temperature |
≤80℃ (high-temperature versions customizable) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
3200 ± 200 Gauss (measured with Japanese TM-801 Gauss meter) |
|
Magnetic Flux Value |
2.3 mWb (measured with fluxmeter) |
Surface Coating and Corrosion Protection
Neodymium Iron Boron (NdFeB) magnets exhibit excellent magnetic performance but inherently possess poor corrosion resistance due to their microstructure and rare-earth content. Without proper surface protection, NdFeB magnets are susceptible to oxidation and corrosion, especially in humid or chemically aggressive environments.
Therefore, surface coating is a critical factor in ensuring long-term reliability and service life.
Common Surface Coating Options
Nickel Plating (Ni-Cu-Ni)
Structure: Triple-layer electroplating (Nickel–Copper–Nickel)
Characteristics:
Smooth and bright metallic appearance
Good overall corrosion resistance
Strong adhesion and mechanical durability
Typical Applications:
Motors and sensors
Consumer electronics
General industrial environments
Salt Spray Resistance: Typically 48–96 hours
Epoxy Coating
Characteristics:
Excellent resistance to moisture and corrosion
Superior protection in high-humidity and harsh environments
Available in black, gray, or customized colors
Considerations:
Lower surface hardness compared to metal coatings
Typical Applications:
Outdoor equipment
Renewable energy systems
Marine or high-humidity environment
Salt Spray Resistance: Up to 240 hours or more
Packaging & Transportation
- Perform final QC check in accordance with inspection standards.
- Reject or rework any magnets with visible damage or coating defects.
- Package magnets using impact-resistant and non-magnetic materials.
- Ensure cartons are tightly packed to prevent internal movement.
- Record packaging batch information for traceability.
General Handling & Safety
NdFeB magnets are brittle; avoid impact, dropping, or collision.
Keep fingers clear when handling strong magnets to prevent pinching injuries.
Do not allow magnets to snap together unexpectedly.
Store magnets in a dry environment to prevent corrosion.
Keep away from electronic devices, magnetic cards, and medical implants.
FAQ
Q1. What factors determine the maximum working temperature of NdFeB magnets?
The maximum working temperature depends on the magnet grade, intrinsic coercivity (Hcj), alloy composition, and microstructure optimization. Higher temperature grades typically require increased heavy rare earth content or advanced grain boundary diffusion technology.
Q2. How does grain boundary diffusion improve NdFeB magnet performance?
Grain boundary diffusion introduces heavy rare earth elements at the grain boundaries rather than throughout the entire magnet, significantly improving coercivity and thermal stability while reducing overall rare earth consumption.
Q3. Why do NdFeB magnets require surface coating?
NdFeB magnets are chemically active and prone to oxidation and corrosion. Surface coatings provide protection against moisture, chemicals, and mechanical damage, extending service life in various environments.
Contact Us
Phone / WhatsApp / WeChat: +86 13829120676
Email: Info@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China
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