The industrial dominance of sintered NdFeB permanent magnets is rooted in their exceptional intrinsic properties. From a physical chemistry perspective, substances are classified based on their response to external magnetic fields—specifically, diamagnetism, paramagnetism, and ferromagnetism. The latter represents the foundation of permanent magnetic materials, where exchange interaction leads to spontaneous, parallel alignment of atomic magnetic moments within distinct regions called domains.
Our research and development processes at Zhejiang Laysun Magnetics Ltd. leverage these fundamental principles to design high-performance NdFeB alloys. The Nd2Fe14B tetragonal crystal structure exhibits exceptional uniaxial magnetocrystalline anisotropy, meaning the magnetic moments align preferentially along a specific crystallographic axis (the c-axis). This property ensures an incredibly high coercivity (resistance to demagnetization) and remanence (retained magnetic field strength).
By controlling the grain boundaries during the sintering phase, we restrict domain wall motion, which is crucial for applications that experience severe temperature swings and high demagnetizing forces, such as Electric Vehicle (EV) drive motors and aerospace actuators.
Founded at the turn of the millennium in 1999, Zhejiang Laysun Magnetics Ltd. has evolved from a local visionary startup to a global pacesetter in advanced magnetic materials. Located in Hangzhou, Zhejiang, and powered by our comprehensive production facility in Suining, Sichuan, we focus on the entire value chain: from research and raw materials extraction optimization to sintering, machining, plating, and final validation.
As a national high-tech enterprise, we invest heavily in R&D. Our core focus centers on developing heavy rare-earth-free (HRE-free) or reduced-HRE magnets using Grain Boundary Diffusion (GBD) technology. This permits our materials to operate seamlessly at elevated working temperatures (up to 200°C) without relying on high concentrations of expensive Dysprosium (Dy) or Terbium (Tb).
By partnering directly with domestic upstream rare earth miners, we secure stable access to Neodymium, Praseodymium, and Heavy Rare Earth elements, minimizing geopolitical pricing fluctuations for global importers.
Equipped with automatic vacuum sintering furnaces, multi-wire cutting machines, and automated optical inspection systems (AOI), we achieve extreme consistency in magnetic performance and dimensional tolerances (+/-0.05mm).
Our operations comply with key global specifications, including ISO 9001 and ISO 14001, verifying that every batch shipped conforms to industrial parameters.
In accordance with industry standards, we control the intrinsic properties of our magnetic substances. The table below lists the performance parameters for our typical industrial-grade sintered Neodymium Iron Boron magnets:
| Material Grade | Remanence (Br) [T] | Remanence (Br) [kGs] | Coercivity (Hcb) [kA/m] | Intrinsic Coercivity (Hcj) [kA/m] | Max. Energy Product (BH)max [kJ/m³] | Max. Working Temp (°C) |
|---|---|---|---|---|---|---|
| N35 | 1.17 - 1.22 | 11.7 - 12.2 | ≥ 868 | ≥ 955 | 263 - 287 | 80 |
| N45H | 1.32 - 1.38 | 13.2 - 13.8 | ≥ 955 | ≥ 1353 | 342 - 366 | 120 |
| N42SH | 1.28 - 1.32 | 12.8 - 13.2 | ≥ 987 | ≥ 1592 | 318 - 342 | 150 |
| N38UH | 1.22 - 1.25 | 12.2 - 12.5 | ≥ 876 | ≥ 1990 | 287 - 310 | 180 |
| N35EH | 1.17 - 1.22 | 11.7 - 12.2 | ≥ 836 | ≥ 2388 | 263 - 287 | 200 |
For procurement officers in EV, wind energy, and robotics, sourcing high-performance magnetic substances requires assessing several crucial performance metrics beyond dimensions:
Request ASTM-compliant demagnetization curves (B-H curves) at expected operating temperatures (e.g., 120°C, 150°C, 180°C) to verify that irreversible flux loss falls within your engineering margins.
Uncoated NdFeB is highly susceptible to oxidation. Depending on the environment, specify: Nickel-Copper-Nickel (NiCuNi) for general electronics; Epoxy or Teflon for humid operating conditions; and Rubber-coated variants for non-slip, scratch-proof applications.
High-speed rotation in electric motors requires tight tolerance control. Ask for CPK data to confirm dimensional deviations remain below ±0.05 mm.
Zhejiang Laysun Magnetics complies with global industrial standards. If you need copies of our compliance certifications (ISO9001, ISO14001, CE), please contact our sales office.
Quality Management Certificate
Environmental System Compliance
CE Compliance Assessment
Looking to source custom-grade NdFeB magnets, arc segments, or potted assemblies? Our engineering team works with your files to deliver tailored prototypes and volume pricing schedules.
Laysun Magnetics