Product Overview & Application Scenarios
These high energy density cylindrical rare earth magnets are a powerful and adaptable solution for various home and industrial uses. They provide a compact yet reliable magnetic hold, making them ideal for crafting magnetic fittings, holding cabinet doors, or organising living and workspaces. In advanced technological fields, they are indispensable in the electronics sector, particularly within sensors and miniature motors, where their precise dimensions enhance efficiency and operational stability. They are also employed in the telecommunications industry, improving signal transmission and clarity in antenna systems. Thanks to their combination of strength, precision, and flexibility, these high grade cylindrical rare earth magnets are perfectly suited for everyday household projects as well as high-performance industrial applications.
Technical Specifications
|
Product Name |
cylindrical rare earth magnets |
|
Magnet Grade |
N35 (Br ≥11.8kGs, Hcj ≥12 kOe) |
|
Dimension |
N35-D5*20 |
|
Dimensional Tolerance |
+/-0.05 |
|
Operating Temperature |
≤80°C (High-temp versions available) |
|
Density |
≥7.5 g/cm³ |
|
Surface Magnetic Field |
4,300 Gs |
|
Magnetic Flux |
2.0 mWb (Fluxmeter-tested) |
Manufacturing Process
Raw Material Preparation
High-purity rare earth Neodymium (Nd), Iron (Fe), Boron (B), and selected alloying elements (such as Dysprosium or Terbium for high-temperature grades) are carefully weighed according to precise composition formulas. Strict control of chemical purity is essential to ensure consistent magnetic properties.
Vacuum Melting and Strip Casting
The prepared raw materials are melted in a vacuum induction furnace to prevent oxidation. The molten alloy is then rapidly solidified using a strip casting process, forming thin alloy flakes with uniform microstructure. This step ensures homogeneity and improves subsequent magnetic performance.
Hydrogen Decrepitation (HD)
The cast alloy flakes undergo hydrogen decrepitation, where hydrogen gas penetrates the alloy and causes it to fracture into coarse powder. This process improves powder brittleness and prepares the material for fine milling while maintaining magnetic integrity.
Packaging & Transportation
● Pre-Packing Inspection
All NdFeB magnets are inspected for appearance, dimensions, coating integrity, and magnetic performance. Only qualified products proceed to packing.
● Demagnetization or Magnetic Isolation
If required, magnets are demagnetized before packing. For magnetized products, magnetic shielding or spacing is applied to prevent mutual attraction and damage.
● Surface Protection
Each magnet is separated using plastic sheets, foam, or paper spacers to avoid chipping, scratching, or coating damage.
FAQ
Q1 How does temperature affect NdFeB magnet performance?
NdFeB magnets experience irreversible loss of magnetic properties when operated above their maximum working temperature. High-temperature grades (H, SH, UH, EH, AH) are designed with increased coercivity but typically sacrifice some magnetic strength (Br). Long-term exposure near the maximum temperature can still cause gradual demagnetization.
Q2. What is the difference between intrinsic coercivity (Hcj) and coercivity (Hcb), and why does it matter?
Hcj (Intrinsic Coercivity): Resistance to demagnetization from external magnetic fields or heat; critical for high-temperature or high-stress applications.
Hcb (Coercivity): Resistance to demagnetization under closed-circuit conditions.
Design engineers should prioritize Hcj when magnets are exposed to elevated temperatures or opposing magnetic fields.
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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