Browse our top sintered and bonded Neodymium magnets engineered for high coercivity, thermal tolerance, and exact geometric limits.
Founded at the turn of the millennium in 1999, Zhejiang Laysun Magnetics Ltd. has evolved from a local manufacturer to a national high-tech enterprise at the forefront of the permanent magnet industry. Our comprehensive business model integrates scientific R&D, mass-scale manufacturing, strict quality verification systems, and global logistics coordination.
Equipped with 300+ technical employees, our automated and vacuum-sintering facilities output 5,000 metric tons of custom Neodymium-Iron-Boron (NdFeB) materials annually. We address challenges in mechanical shear, magnetic loss under high thermal stress, and corrosion in extreme environments.
Quality, Credibility, Technology, and Innovation define our strategic orientation to maximize longevity and performance value.
Through our rigorous quality checking workflows, we confirm that every batch complies with strict standards like ISO 9001 and ISO 14001, providing long-term reliability for critical industrial systems.
By investing in new R&D for Dysprosium-saving and Terbium-diffusion processes, we minimize dependence on volatile heavy rare earths while improving thermal resistance and physical reliability.
Our 100,000 square meter factory ensures reliable bulk supply profiles, preventing disruptions in production timelines for electric vehicles and industrial motor manufacturers.
A critical overview of the engineering innovations, material science shifts, and economic factors shaping the future of NdFeB rare earth magnets.
Modern electric powertrains and industrial servo systems are operating under increasingly demanding conditions. Sintered NdFeB magnets, while offering superior energy density, traditionally suffer from thermal degradation. Above specific temperature thresholds, structural demagnetization occurs. This has catalyzed the development of high-coercivity grades (such as EH and AH series) that maintain magnetic stability at temperatures exceeding 200°C.
To manage rare earth costs, the industry is transitioning away from heavy rare earth alloying. Grain Boundary Diffusion (GBD) selectively introduces Dysprosium (Dy) or Terbium (Tb) into the magnet’s boundary phases rather than the main grains. This process boosts coercivity while preserving high remanence, allowing designers to reduce heavy rare earth content by up to 60%.
Neodymium is highly reactive, making effective corrosion protection essential. Our modern treatments, including multilayer Nickel-Copper-Nickel (Ni-Cu-Ni), epoxy resin, and chemical vapor deposition (CVD) zinc, prevent oxidation in humid or chemically aggressive environments, ensuring long component lifespans.
| Magnet Grade Category | Max Operating Temp (°C) | Remanence - Br (mT) | Coercivity - Hcb (kA/m) | Intrinsic Coercivity - Hcj (kA/m) |
|---|---|---|---|---|
| NdFeB N35 - N52 (Standard) | 80 | 1170 - 1480 | ≥ 876 | ≥ 955 |
| NdFeB 35M - 50M (Medium Temp) | 100 | 1170 - 1430 | ≥ 876 | ≥ 1194 |
| NdFeB 35H - 48H (High Temp) | 120 | 1170 - 1390 | ≥ 907 | ≥ 1353 |
| NdFeB 33SH - 45SH (Super High) | 150 | 1130 - 1360 | ≥ 876 | ≥ 1592 |
| NdFeB 30UH - 40UH (Ultra High) | 180 | 1080 - 1280 | ≥ 828 | ≥ 1989 |
| NdFeB 28EH - 38EH (Extra High) | 200 | 1040 - 1250 | ≥ 796 | ≥ 2387 |
Explore our custom-machined profiles, multi-pole magnetic rings, and specialty automotive components.
Zhejiang Laysun Magnetics customizes material properties to meet the specific requirements of various industries.
High-precision joint actuators and robotic arm servo motors require stable magnetic flux density to ensure repeatable positioning and operational accuracy.
High power-to-weight ratios are key. Our lightweight NdFeB materials maximize motor output without increasing overall weight.
Providing high-coercivity sintered NdFeB blocks designed to withstand thermal cycles and reverse magnetic fields in electric vehicle drivetrains.
Durable magnetic arrays designed for high rotation speeds, vibration resistance, and sudden stop cycles.
Precision micro-magnets for smartphones, audio equipment, magnetic connectors, and camera focus modules.
High-efficiency compressor motors for air conditioning and variable frequency appliances, meeting energy efficiency standards.
To support international supply chains, Zhejiang Laysun Magnetics maintains a comprehensive quality management system. Our manufacturing processes are certified to meet major international standards.
With our logistics hubs in Hangzhou and our primary production facilities, we streamline transport times and handle export clearances efficiently for global markets.
Zhejiang Laysun Magnetics quality certificates (Contact support to request full verification documents).
Expert technical responses to key questions on magnetic performance, demagnetization limits, and coating options.
NdFeB magnets exhibit a reversible loss of remanence (Br) and coercivity (Hcj) as temperature increases. Standard grades lose approximately 0.12% of their magnetic strength per °C rise (known as the temperature coefficient of remanence, αBr) and 0.6% of their coercivity per °C (βHcj). When operating temperatures cross the recommended threshold of a specific grade, this loss becomes permanent. Using our UH, EH, or AH grades prevents permanent demagnetization under continuous high-temperature operation.
Grain Boundary Diffusion (GBD) introduces heavy rare earths like Dysprosium (Dy) or Terbium (Tb) selectively into the crystal grain boundaries instead of alloying them throughout the entire magnet. This targeted structure enhances magnetic isolation between Nd2Fe14B grains, increasing intrinsic coercivity (Hcj) without sacrificing remanence (Br), and improves overall thermal stability.
Choosing the right coating depends on the application environment. For humid conditions, a Ni-Cu-Ni multilayer electroplate provides excellent mechanical protection. For applications involving chemical exposure or marine conditions, epoxy resin coatings or autophoretic coatings are recommended as they resist saltwater corrosion and pass salt spray testing for up to 500 hours.
Yes, we provide custom multipolar configurations. Using specialized magnetizing fixtures, we can program multi-pole configurations (such as 4, 8, 12, 16, or 24 poles) on ring-shaped sintered or bonded NdFeB magnets. This is highly suitable for high-speed brushless DC (BLDC) motors, automotive EPS, and precise optical encoders.
Browse our remaining high-performance magnet categories, optimized for consumer appliances, motors, and magnetic lifters.
Contact our engineering and sales teams for custom specifications, bulk pricing, or grain boundary diffusion configurations. We aim to respond within 24 hours.
Laysun Magnetics
