Direct supply options for global industrial, automotive, and technological manufacturing systems.
Your trusted partner in the world of advanced magnetic solutions. Since our inception in 1999, we have grown to become a national high-tech leader in manufacturing rare earth magnets, a testament to our unwavering commitment to excellence in this niche field.
Headquartered in Hangzhou, China, and leveraging our state-of-the-art factory sprawling across 100,000 square meters in the vibrant city of Suining, Sichuan, Zhejiang Laysun Magnetics Ltd. has rapidly evolved from a visionary startup to an industry pacesetter. Our strategic location combines regional production efficiencies with world-class logistics connections.
Deep-dive whitepaper detailing the physics, metallurgy, and future trends of Sintered NdFeB Magnetics.
Neodymium-Iron-Boron (NdFeB) magnets represent the pinnacle of modern rare earth permanent magnet technology. The fundamental phase responsible for the exceptional magnetic properties of these materials is the tetragonal Nd₂Fe₁₄B crystalline structure. By alloy engineering, manufacturers introduce minor alloying elements such as Dysprosium (Dy), Terbium (Tb), Cobalt (Co), and Copper (Cu) to optimize temperature stability, chemical resilience, and intrinsic coercivity ($H_{cj}$).
In high-operating temperature applications (e.g., automotive traction motors and wind turbine generators), maintaining magnetic alignment against strong demagnetizing fields is critical. The introduction of heavy rare earth elements (HREE) like Dy and Tb at the grain boundary phases drastically reduces high-temperature flux losses, allowing NdFeB configurations to work reliably in temperatures exceeding 200°C (classes SH, UH, EH, AH).
Pure elements are melted under vacuum. The molten alloy is poured onto a water-cooled rotating copper roller to produce thin flakes (0.2-0.4 mm) with a highly uniform microcrystalline structure, suppressing the formation of free iron.
The strip-cast flakes absorb hydrogen gas, which expands the lattice structure and causes the alloy to fragment along grain boundaries, generating pre-crushed powders ready for fine milling.
Using high-pressure inert gas (Nitrogen), particles collide to achieve a narrow size distribution (usually 3.0 to 4.5 μm). Controlling particle size is vital to achieving a high squareness ratio in the final magnet.
The powder is oriented under a strong magnetic field (1.5–3.0 Tesla) and compacted. Alignment preserves the anisotropic properties, ensuring maximum magnetic energy density ($(BH)_{max}$).
Green bodies are heated in high-vacuum sintering furnaces to ~1050°C-1100°C. Sintering achieves nearly 100% density. Multi-stage annealing heat treatment follows to optimize the grain boundary structure.
As heavy rare earths (Dy/Tb) are geographically scarce and highly volatile in price, Zhejiang Laysun Magnetics utilizes state-of-the-art Grain Boundary Diffusion (GBD) technology. Instead of adding Dy/Tb during the initial induction melting phase, a thin coating of Dy/Tb compound is applied to the surface of the sintered magnet. Through precision heat treatment, these heavy elements diffuse selectively along the Nd-rich grain boundaries. This technique achieves comparable levels of high coercivity while reducing overall HREE consumption by up to 50–70%, rendering high-performance magnets more cost-efficient and environmentally sustainable.
Unmatched industry experience, processing scalability, and dedication to rare earth technological innovation.
Founded in 1999, Laysun Magnetics brings over two decades of deep material-science expertise. This long-term industrial commitment translates to unparalleled reliability in high-volume, mission-critical rare earth supplies.
As an accredited national high-tech manufacturing firm, we house fully automated strip casting lines, hydrogen decrepitation systems, jet mills, and advanced vacuum sintering plants designed for high-coercivity NdFeB grades.
Our expansive 100,000 m² factory in Suining, Sichuan produces up to 5,000 tons of rare earth magnets annually. This massive scale guarantees high volume consistency, reliable delivery lead times, and pricing resilience.
Our magnets power state-of-the-art technologies including electric vehicles (EV), industrial motors, wind energy systems, computer storage hard drives, mobile telecommunications, and consumer electronic peripherals.
Our core operating values—Quality, Credibility, Technology, and Innovation—guide every batch we ship. Every magnet undergoes strict magnetic testing, dimensional analysis, and environmental lifetime testing.
Backed by over 300 highly trained employees, including metallurgical PhDs, material engineers, and quality assurance specialists, Laysun is capable of offering customized CAD designs and technical solutions.
How advanced magnetics empower high-performance modern industrial and consumer technology systems.
Automotive EPS motors demand high magnetic flux stability and extremely low cogging torque to ensure smooth feedback to the driver. Our high-coercivity Neodymium magnets maintain reliable performance in temperature variations under the hood, ensuring safety and efficiency.
Traction motors in modern electric vehicles require magnets capable of resisting strong demagnetizing fields. Laysun’s specialized UH and EH sintered block magnets offer the required thermal resilience and high $(BH)_{max}$ to optimize power density and driving range.
Consumer electronic components like camera autofocus systems and hard disk drive head actuators rely on VCMs. These applications demand micro-sized NdFeB components with strict dimensional tolerances and cleanroom packaging to avoid micro-particle contamination.
Large-scale wind turbine rotors utilize segmented arc magnets to convert physical wind motion into clean electrical energy. High corrosion-resistant coatings, such as double-layered Epoxy or Everlube, are applied to survive harsh offshore maritime environments.
For heavy-duty manufacturing and metal recycling, NdFeB manual magnetic lifters with up to 1000kg load capacity provide reliable holding force without requiring electric power supply, minimizing operation hazards in industrial plants.
Modern smart devices and accessories utilize custom ring and disc shapes for magnetic alignments, which require strict magnetic field symmetry and ultra-thin profiles, allowing efficient wireless charging compatibility.
Serving diverse sectors globally with specialized magnetic grades and configurations.
Strategically structured to guarantee compliant material sourcing and streamlined global supply networks.
Headquartered in Hangzhou, China, Eneroc is building our worldwide subsidiaries and offices to serve our customers. This extensive sales network ensures real-time customer support, custom engineering consultations, and dynamic inventory management across various time zones.
We strictly prioritize environmental compliance and quality certifications, making sure our magnets pass the rigorous demands of industrial international markets. We are proud to maintain compliance and offer support for the following certifications:
Additional Technical Certificates Available Upon Request
A comprehensive overview of manufactured shapes and configurations from Laysun Magnetics.
Get answers to critical metallurgical, supply-chain, and application questions related to NdFeB manufacturing.
Sintered NdFeB quality is primary defined by its Magnetic Remanence ($B_r$), Intrinsic Coercivity ($H_{cj}$), and Maximum Energy Product ($(BH)_{max}$). Grades are labeled using prefixes (e.g., N35 to N56) to represent $(BH)_{max}$ in MGOe, followed by letters (M, H, SH, UH, EH, AH) designating the temperature range and demagnetization resistance. High-grade systems are evaluated by hysteresis-graph trace, density metrics, and the micro-structural alignment factor.
Because the Nd-rich grain boundary phase in sintered NdFeB is highly reactive, surface coatings are critical. We offer Ni-Cu-Ni electroplating, organic Epoxy coatings, Autophoretic coatings, chemical Gold plating, and specialized Everlube or Tefzel sprays. For harsh conditions, we perform Highly Accelerated Temperature and Humidity Stress Testing (HAST) and Salt Spray Testing (SST) up to 1000 hours to ensure complete environmental isolation.
Heavy rare earths, such as Dysprosium (Dy) and Terbium (Tb), replace Neodymium atoms in the crystal structure to increase coercivity, preventing demagnetization at temperatures up to 220°C. However, since HREEs are highly expensive, we implement Grain Boundary Diffusion (GBD) technology. This diffuses Dy/Tb selectively along boundaries rather than distributing them throughout the magnet grain, lowering material costs while maintaining maximum heat stability.
For high-precision applications like smartphone camera VCMs and micro-sensors, we achieve dimensional tolerances as low as +/-0.01 mm using automated double-disc grinding, wire EDM cutting, and high-precision diamond wheel slicing. Optical measurement projection systems verify each batch before vacuum packaging.
Our 100,000 m² Sichuan production hub is located near key regional primary raw material processing hubs, minimizing delays. Utilizing Sichuan's local green hydro-energy significantly reduces operational electricity overhead, keeping our production costs highly competitive on a global scale. Combined with our logistics and trade headquarters in Hangzhou, we ensure fast, compliant, and cost-effective shipping routes.
Explore our targeted magnetic utilities designed for specialized fishing, lifting, and device mounts.
Join us on our journey toward a magnetically empowered future. Zhejiang Laysun Magnetics Ltd. provides the manufacturing capabilities, technical scale, and strict quality compliance necessary to optimize your supply chain. For price lists, technical sheets, and custom magnet samples, contact our Hangzhou office today.
Leave your email details below. Our team of sales engineers will contact you with custom estimates within 24 hours.
Laysun Magnetics