Thermal stable high flux sintered rare earth Gold Coated square shaped NdFeB Magnet

1. Product Overview

The thermal stable strong magnetic force high flux sintered rare earth Gold Coated square shaped NdFeB Magnets are annular permanent industrial magnet for automation with a closed magnetic circuit structure. They are widely used in applications requiring uniform magnetic fields or axial/radial magnetism. With excellent magnetic properties, structural stability, and machining adaptability, these customized thermal stable high flux high torque corrosion resistant sintered rare earth Gold Coated square shaped NdFeB Magnets are key components in high-precision electromechanical systems, inductive devices, and electronic assemblies. Compared to other magnet shapes, the magnetic ring offers better integration and concentrated magnetic flux, improving system efficiency. 

2. Technical Parameters

3. Manufacturing Process

The manufacturing process of this precision customized premium quality thermal stable high flux sintered rare earth Gold Coated square shaped NdFeB Magnet are as following:

- Pulse Plating: Uses pulsed current control to create denser and more uniform metallic crystal structures. Compared to traditional plating, this significantly improves coating adhesion and corrosion resistance.

- Laser Sealing: High-precision laser scanning seals micro-cracks and pores on the coating surface, improving resistance to moisture, salt spray, and harsh environments. Corrosion resistance can exceed 1000 hours.

- Parylene Vacuum Coating: A conformal polymer layer applied by vapor deposition (CVD). It is pinhole-free, highly insulating, biocompatible, and chemically resistant. Widely used in medical and clean environments. 

4. Surface Treatment & Coating Technology

- Copper Undercoating: Enhances adhesion and fills micro-porosity.

- Ni-Cu-Ni Coating: A three-layer plating that improves rust, corrosion, and abrasion resistance.

- Epoxy Coating: Black or gray finish; enhances thermal resistance and is suitable for humid or chemical environments. 

5. Appearance & Dimensional Inspection Standards

- Manual measurement using micrometer/caliper

- Visual inspection under 800–1200 lumens

- 2D optical inspection for non-standard shapes 

6. Reliability Testing

-Thermal Shock Cycling Test:

Evaluates the structural integrity and coating adhesion of magnets under extreme temperature fluctuations.

- Magnetic Performance Consistency Test:

Uses a Gaussmeter to verify the uniformity of surface magnetic field, remanence, and magnetic flux across different production batches, ensuring minimal performance deviation that could affect final assembly or operational stability. 

-Tensile/Adhesive Strength Test:

Applicable to applications involving adhesive bonding or magnet assemblies. A tensile testing machine measures the maximum force required to peel the magnet off its bonded substrate, ensuring reliable adhesion against vibration or aging effects.

7. Packaging Process

Items with cosmetic or dimensional defects are eliminated through strict inspection

Qualified units are magnetized in batches and arranged in order

Packed per client specifications with customized labeling

Each unit is vacuum-packed with magnetic shielding and shockproof padding for enhanced protection 

8. Application Fields

- Motor Systems: Brushless, stepper, and servo motors, Bluetooth earphone, headphone

- Sensor Components: Hall sensors, encoders, displacement detectors 

-Medical Devices: MRI systems, electromagnetic clamps

- Consumer Electronics: Magnetic connectors, wireless charging rings

- Industrial Automation: Magnetic coupling systems, transmission parts

- New Energy: EV drives, wind power generators, sensor motor magnet

9. Usage Precautions

- Avoid impact or dropping; NdFeB is brittle

- Use sliding motion to separate to avoid pinching

- Install with correct polarity to ensure device stability

- Store away from heat, humidity, and corrosive environments

- Keep away from sensitive electronics (pacemakers, hard drives, IC cards)

10. Customization & Services

- Customizable parameters: dimensions, shape, magnetization direction, coating thickness

- Optional laser marking for logos or serial numbers

- Support for sample testing, pull-force testing, and packaging solutions, industrial motor magnet.

We are delighted to provide complimentary customized magnet solutions designed to meet your unique requirements. 

Contact Us:
Phone: +86 18038225892
Email: helen@jinconn.com
Address: Xiaohe Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province, China