Explore our premium grade selections engineered with state-of-the-art rare earth alloys, featuring high thermal stability, reliable coating integrity, and extreme magnetic flux densities.
A trusted partner in the world of advanced magnetic solutions, delivering excellence since 1999.
Founded at the turn of the millennium in 1999, Zhejiang Laysun Magnetics Ltd. has rapidly evolved from a visionary startup into an industry pacesetter and recognized national high-tech enterprise. Our modern, highly-integrated manufacturing plant, spanning over 100,000 square meters in the vibrant economic development zone of Suining, Sichuan, represents the heart of our operations.
Backed by an expert workforce of over 300 highly skilled engineers, researchers, and technical staff, we maintain an annual output capacity of over 5,000 tons of sintered NdFeB magnets. This massive capacity allows us to dynamically satisfy high-volume requirements across global automotive, electronics, robotics, and industrial sectors without compromising our strict, rigorous zero-defect quality culture.
At Zhejiang Laysun Magnetics Ltd., we construct our corporate philosophy on four crucial pillars: Quality, Credibility, Technology, and Innovation. Over 25 years, our commitment to exploring the physical boundaries of rare earth element arrays has motivated us to deploy substantial R&D resources into optimizing NdFeB (Neodymium Iron Boron) microstructures. This persistent focus ensures that our magnets consistently perform in high-stress thermal environments, maintain exceptional magnetic flux stability, and offer robust oxidation resistance.
Understanding the tectonic shifts in the rare earth magnetics landscape
The global push towards carbon neutrality is driving unprecedented demand for high-performance rare earth permanent magnets, particularly in electric vehicle (EV) powertrains, wind energy generation, and high-efficiency industrial motors. Neodymium magnets (NdFeB) remain the most powerful type of permanent magnets commercially available, providing the highest torque-to-weight ratio for electric traction motors. As automakers scale up their EV programs, sourcing highly stable permanent magnets with excellent coercivity (Hcj) at high operating temperatures (up to 200°C) has become a primary bottleneck for procurement teams.
With rare earth element mining and refining heavily concentrated in specific geographical nodes, global procurement managers are increasingly prioritizing "supply chain resilience" and "geographical de-risking". The standard sourcing model has shifted from finding the absolute lowest price to securing supply partnerships with integrated manufacturers that own stable, high-capacity facilities (like our 100,000 m² factory in Suining). This ensures that upstream material price volatility does not halt production schedules downstream.
In high-temperature applications, such as automotive EPS or electric drivetrains, standard Neodymium magnets lose magnetism rapidly due to thermal demagnetization. Traditionally, heavy rare earths (HREs) like Dysprosium (Dy) and Terbium (Tb) were alloyed into the magnet core to counteract this. Today, advanced manufacturers utilize Grain Boundary Diffusion (GBD) technology. GBD targets these expensive HRE elements strictly at the grain boundaries, allowing magnets to achieve high temperature resistance (up to 220°C) while reducing HRE usage by up to 70%, translating to significant cost savings and sustainable sourcing practices.
Environmental, Social, and Governance (ESG) mandates are transforming industrial sourcing. Industrial equipment buyers are tracking the carbon footprint of their components. Zhejiang Laysun Magnetics actively invests in green metallurgy, waste heat recovery systems, and automated, low-emission sintering processes. This commitment aligns our production pipeline with the strict environmental compliance requirements of tier-1 European, American, and Japanese OEMs.
Inside the Metallurgy and Advanced Material Science of Zhejiang Laysun Magnetics
Using ultra-precise vacuum sintering furnaces and high-intensity magnetic orientation fields, we ensure that the microcrystalline structure of our NdFeB alloys achieves maximum Remanence (Br) and Energy Product (BH)max.
Our operational GBD production line diffuses heavy elements (Dy/Tb) selectively through the boundary network. This raises thermal threshold parameters while optimizing material costs for the client.
We operate advanced, automated electroplating systems offering options including Tri-layer Nickel-Copper-Nickel (Ni-Cu-Ni), Epoxy Coating, Zinc (Zn), and Gold (Au) platings to achieve up to 1000+ hours in salt spray testing (SST).
Our engineering laboratory operates under tight tolerances, allowing us to produce custom shapes (arcs, segments, rings, blocks, countersunk holes, and multi-pole magnetized assemblies) with dimensional precision down to ±0.01mm. By controlling the entire manufacturing process—from raw material melting, strip casting, hydrogen decrepitation, jet milling, magnetic field alignment, pressing, sintering, machining to final coating—we ensure high stability across batches, eliminating the risk of internal structural cracking or sudden magnetic flux drops in application environments.
Where our advanced magnetic compounds empower technological breakthroughs
In Automotive Electric Power Steering (EPS), reliability is crucial. EPS motors demand tight magnetic flux deviations, typically under 1%. Our specialized NdFeB formulations, enriched through grain boundary control, guarantee minimal thermal degradation under long-term cyclical loads. For Voice Coil Motors (VCM) in hard drives and high-resolution optical camera assemblies, our ultra-thin block and segment magnets enable fast actuators with minimal latency.
For industrial wind turbine generators, we design and produce heavy-duty NdFeB Arc Segment Magnets. These complex structural profiles are optimized for low cogging torque, helping generator systems operate smoothly and maximize kinetic-to-electrical energy conversion ratios even under high-wind mechanical stress.
Ensuring complete peace of mind through strict international standards
We understand that sourcing components for high-risk industrial applications requires absolute reliability. Our plants operate under certified quality management systems: ISO 9001 and ISO 14001, and we follow strict testing regimes aligned with global regulations, including RoHS, REACH, and critical safety certifications like API 6D, API 607, and CE.
Our quality control laboratories are equipped with industry-leading diagnostic machinery: demagnetization curves plots (hysteresisgraphs), inductively coupled plasma (ICP) spectrometers, scanning electron microscopes (SEM), salt spray test cabinets, and thermal degradation chambers. Every batch of magnetic material is issued a complete Certificate of Analysis (CoA) containing detailed demagnetization metrics (Br, Hcb, Hcj, BHmax) and precise dimensional tolerances.
Our engineering division will review your drawings, magnetizing specifications, and environmental parameters to provide a comprehensive pricing quote and FEA magnetic simulation analysis within 24 hours.
In-depth technical answers from our Principal Materials Scientist
A: The letter prefix/suffix system indicates magnetic strength and thermal limitations. The number (e.g., 35, 52) refers to the Maximum Energy Product (BH)max in MGOe. A higher number indicates a higher magnetic field capability. The letter suffix (e.g., M, H, SH, UH, EH, AH) denotes the intrinsic coercivity (Hcj). Lower suffixes mean the magnet is more susceptible to permanent demagnetization at elevated temperatures. For example, N35 can operate up to 80°C, while 45SH is rated up to 150°C under typical load-line conditions.
A: Sintered NdFeB is highly susceptible to oxidation because of its high iron content and intergranular neodymium-rich phase. We mitigate this through vacuum sintering and passivation plating. Our primary recommendation for harsh conditions is a triple-layer Ni-Cu-Ni or organic epoxy coating, which forms a dense, non-porous moisture barrier.
A: We utilize advanced Grain Boundary Diffusion (GBD) technology. Instead of melting Dy/Tb elements into the alloy matrix, we diffuse Dy/Tb compounds from the surface of the sintered magnet along the grain boundary during a secondary heat treatment. This increases coercivity at the exterior shell of the crystals where demagnetization risk is highest, saving raw materials and lowering overall costs.
A: Tooling design, alloy preparation, sintering, precision slicing, and plating typically take 15 to 25 days. For standard geometric blocks and cylinders, we can dispatch prototypes sooner using our existing inventory blocks.
A: We achieve consistency through automation at key process points. Our modern jet milling and field alignment systems are computer-controlled to ensure uniform grain size distribution (typically around 3-5 microns) and consistent orientation angles. Every batch is validated using automated Helmholtz coil checks.
A: Yes, we design and manufacture complex magnetic assemblies, such as pot magnets, hook magnets, and rotor assemblies. Our metal workshop handles CNC machining, gluing, and insertion of magnets into mild steel, stainless steel, or plastic housings to optimize overall circuit performance.
Explore our custom series, pot geometries, wind-turbine segment modules, and specialty industrial lifters.
Laysun Magnetics