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Technology R&D

Grain Boundary Diffusion (GBD)
Technology R&D
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Since its establishment, Tongchuang has always focused on technological research and innovation, and has a high-level R&D team that has been deeply involved in the neodymium iron boron industry for nearly 30 years. Led by the market and customer demand, backed by NIMTE (Chinese Academy of Sciences) and Postdoctoral Workstation, and with professional engineering and technical personnel as the outposts, we can provide customers with forward-looking consulting and advice on the permanent magnet industry, assist customers in improving magnetic circuit design, solving problems encountered during the use of magnets, and provide the best cost-effective permanent magnet products to maximize the efficiency of magnets.

Microscopic Organization Regulation
Microscopic regulation includes grain refinement and improvement of grain consistency

1.

Improvement of columnar crystal structure through columnar crystal modification in the casting process
Columnar crystal structure Columnar crystal structure

2.

Control of particle size distribution by multi-stage grinding in Jet milling process
Particle size distribution

3.

Low-temperature sintering process to control particle size and distribution in the sintering process
Low-temperature sintering process Low-temperature sintering process

4.

Same material formulation with improved microstructure and properties (Hci)through production process optimisation and equipment improvement.
Magnetic properties table

 

Dual Alloy
Controlling heavy rare earth elements at magnet grain boundaries to improve anisotropic fields at grain boundaries and increase magnet coercivity
Design the main alloy and auxiliary alloy formulas, smelting the cast pieces separately, and then mix them together. The subsequent process is consistent with the conventional production process.
Ce-containing NdFeB Magnets

Cerium containing neodymium iron boron magnets refer to the addition of high abundance rare earth elements (lanthanum La, cerium Ce) to the formula of neodymium iron boron NdFeB magnets, reducing the amount of praseodymium neodymium and achieving the goal of cost reduction.

Molecular formula:Nd2Fe14B(Ce2Fe14B,RE2Fe14B)

In recent years, the company has developed a series of high abundance rare earth magnet brand products. In terms of application, it has broken through the limitations of high abundance rare earth magnets concentrated in low-end fields such as maqnetic adsorption, maanetic separation, E-scooter, luggage buckles, door buckles, toys, etc., and expanded them to more stringent application fields such as acoustic devices and industrial motors.

Typical application: E-scooter motor

As shown in the figure on the right, features:

1. Large quantity, requiring ultimate cost-effectiveness;

2. High requirements for rounding;

3. High requirements for magnetic flux range control;

Application and Simulation

Permanent magnets, also known as permanent magnets, can be natural products or artificially manufactured (the strongest magnets are neodymium iron boron magnets). A material with a wide hysteresis loop, high coercivity Hcj, and high remanence Br that can maintain constant magnetism once magnetized.  In applications, permanent magnets work in the demagnetization part of the second quadrant of the magnetic hysteresis loop after deep magnetic saturation and magnetization. Permanent magnets should have the highest possible coercivity Hc, remanence Br, and maximum magnetic energy product (BH) max to ensure maximum storage of magnetic energy and stable magnetism.

 

With rich manufacturing experience and advanced equipment, Tongchuang provides complete engineering support for the design, modelling, prototyping and optimization of magnetic products, continuously improving the functionality of magnetic materials and integrating them into the products which provided to customers.

 

TC has 2D and 3D Finite Element Analysis (FEA) modeling capabilities to analyse magnetic components and assemblies; and we can using Maxwell's magnetic equation design for computer simulation to assist magnet users in calculating magnetic force and selecting the right magnets.

 

Magnetic component track product applications
 

Sensor Magnet
 

Linear Motor Magnet
 

 

Large Halbach Array
 

 

Future Development of Microstructure Regulation
  • 1. Powder particle size: 2.8-3.0 μ m → 2.6-2.8 μ m → < 2.6 μ m
  • 2. Improvement of process oxidation resistance
  • 3. Matching of low-temperature sintering process
  • Future development of dual alloys:
  • 1. Optimization of auxiliary alloy composition
  • 2. Dual main phase+dual alloy

 

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