Product Descriptions
| Parameter | Details |
|---|---|
| Product Name | Block Magnet NiCuNi Coating N52 |
| Magnet Grade | N52 (Max Energy Product: 52 MGOe) |
| Material | Sintered NdFeB (High-purity, Dy-free for maximum remanence) |
| Dimensions (Custom) | Standard: 50mm × 25mm × 10mm; Custom: 5mm – 150mm |
| Coating System | Ni-Cu-Ni (Nickel-Copper-Nickel) Triple Layer |
| Coating Thickness | ≥ 20μm total (Ni: 5μm, Cu: 10μm, Ni: 5μm) |
| Salt Spray Resistance | ≥ 96 hours (ASTM B117) |
| Remanence (Br) | ≥ 1.43 Tesla (14300 Gauss) |
| Coercivity (Hc) | ≥ 876 kA/m (11000 Oe) |
| Operating Temperature | Up to 80°C (Standard); High-temp grades (N52H, N52SH) available |
| Dimensional Tolerance | ±0.05mm (Precision ground surfaces) |
Key Features & Applications
Maximum magnetic performance: N52 grade offers the highest remanence (1.43T) and energy product, providing superior holding force in compact form factors – ideal for the Block Magnet NiCuNi Coating N52 in space-constrained designs.
Superior corrosion resistance: the Ni-Cu-Ni triple coating system (20μm total) provides excellent protection against humidity, salt spray, and industrial solvents, ensuring long-term reliability.
Precision ground surfaces: all dimensions are ground to ±0.05mm tolerance, with surface roughness ≤ Ra0.8μm, ensuring accurate fit in tight assemblies.
Typical applications: automotive sensors, electric motor rotors, magnetic couplings, Hall effect sensors, holding assemblies, and magnetic pump couplings.
Advantages
Highest grade available: N52 offers the strongest commercial magnet performance, allowing designers to achieve higher force in smaller volumes – making the Block Magnet NiCuNi Coating N52 the preferred choice for advanced motor and sensor applications.
Certified quality: our manufacturing processes are IATF16949 and ISO9001 certified, with 100% magnetic flux testing and dimensional inspection for each batch.
Full environmental compliance: all products meet REACH, RoHS, and Conflict Minerals requirements, with SGS test reports available for coating composition and heavy metals.
Flexible customization: we offer custom dimensions (5–150mm length/width), special coatings (Epoxy, PTFE, Zinc, Gold), and magnetized patterns (multi-pole, radial, or axial).
Coating / Plating
Magnets, particularly those made from neodymium iron-boron, require protective coatings primarily to prevent corrosion. Their iron-rich composition is highly susceptible to oxidation and rust when exposed to moisture or chemicals, which can severely degrade magnetic strength and structural integrity. Coatings act as a vital barrier, ensuring long-term performance and durability.
The main coatings include:
Flow Chart of Neodymium Magnets
1.Raw material selection (high-purity NdFeB alloy, 95%+ purity).
2.Strip casting and hydrogen decrepitation (HD) for powder preparation.
3.Jet milling to fine powder (3-5 μm particle size).
4.Oriented pressing under 1.8T magnetic field.
5.Sintering in vacuum furnace (1030°C – 1080°C).
6.Precision grinding to final dimensions (±0.05mm tolerance).
7.Ni-Cu-Ni electroplating (automated barrel plating with thickness monitoring).
8.Magnetization (full saturation) and BH-curve testing.
Packaging & Shipping
Each Block Magnet NiCuNi Coating N52 is individually separated with foam spacers in anti-static trays to prevent chipping and surface scratches. For high-volume orders, we use custom-molded EPE foam inserts inside double-walled cartons. All packages include desiccant bags to control moisture during transit. We support global shipping via air freight (for urgent prototypes) and sea freight (for production volumes), with complete customs documentation including HS code, packing list, and material safety data sheets.
Magnetic Grade Parameters
FAQ
Q: What is the difference between N52 and lower grades?
A: The Block Magnet NiCuNi Coating N52 offers the highest remanence (1.43T) and energy product (52 MGOe), providing approximately 15-20% more magnetic flux than N48 in the same size, allowing for more compact designs.
Q: Can I get dimensions outside the standard range?
A: Yes. We offer custom sizing from 5mm to 150mm in length, width, and thickness. Please provide your dimensional drawing for a tailored quotation.
For custom dimensions, high-temperature grades, and bulk pricing, contact us: WhatsApp/WeChat/Tel: +86-181 3450 2123 | Email: hs15@magnet-expert.com