Nickel Coated Neodymium Block Magnets
Precision-engineered sintered neodymium-iron-boron (NdFeB) permanent block magnets finished with high-durability electrolytic Ni-Cu-Ni triple-layer protective coating. Designed for high-efficiency electric motors, industrial automation, precision sensors, and heavy-duty holding fixtures requiring maximum magnetic flux density and stringent dimensional stability.
High-Performance Ni-Cu-Ni Coated Neodymium Block Magnets (NdFeB)
Precision-engineered sintered neodymium-iron-boron (NdFeB) permanent block magnets finished with high-durability electrolytic Ni-Cu-Ni triple-layer protective coating. Designed for high-efficiency electric motors, industrial automation, precision sensors, and heavy-duty holding fixtures requiring maximum magnetic flux density and stringent dimensional stability.
Technical Specifications Overview
|
Parameter |
Specification Details |
|
Material Composition |
Sintered Neodymium-Iron-Boron (NdFeB) |
|
Available Magnetic Grades |
N35 to N52, N35M-N50M, N35H-N48H, N35SH-N45SH, N28UH-N40UH, N28EH-N38EH |
|
Protective Coating |
Electrolytic Ni-Cu-Ni (Nickel-Copper-Nickel) |
|
Coating Thickness |
10 -- 25 um (Passes 24 -- 96 h Neutral Salt Spray Test / SST) |
|
Max. Operating Temperature |
80 deg.C to 200 deg.C+ (Grade dependent) |
|
Dimensional Tolerance |
Standard +/-0.05 mm to +/-0.10 mm (Precision grinding down to +/-0.02 mm available) |
|
Density |
7.4 -- 7.6 g/cm^3 |
|
Magnetization Direction |
Through thickness, length, width, or customized multi-pole patterns |
Temperature Grade Reference
To prevent thermal demagnetization, select the appropriate temperature series based on your application's peak working environment:
|
Thermal Class |
Max Operating Temp |
Intrinsic Coercivity (Hcj) |
Primary Applications |
|
Standard (N Series) |
<= 80 deg.C |
>= 12,000 Oe |
Holding fixtures, consumer electronics, sensors |
|
M Series |
<= 100 deg.C |
>= 14,000 Oe |
Acoustic transducers, stepping motors |
|
H Series |
<= 120 deg.C |
>= 17,000 Oe |
Industrial automation, servo motors |
|
SH Series |
<= 150 deg.C |
>= 20,000 Oe |
EV traction motors, high-speed rotors |
|
UH Series |
<= 180 deg.C |
>= 25,000 Oe |
Automotive sensors, harsh environment drives |
|
EH Series |
<= 200 deg.C |
>= 30,000 Oe |
Aerospace actuators, high-temperature generators |
Magnetic Performance Matrix by Grade
Grade Remanence (Br, Gauss) Max. Energy Product ((BH)max, MGOe) Coercivity (Hcb, Oe) Intrinsic Coercivity (Hcj, Oe)
|
Grade |
Remanence (Br, Gauss) |
Max. Energy Product ((BH)max, MGOe) |
Coercivity (Hcb, Oe) |
Intrinsic Coercivity (Hcj, Oe) |
|
N35 |
11,700 -- 12,200 |
33 -- 36 |
>= 11,000 |
>= 12,000 |
|
N38 |
12,200 -- 12,500 |
36 -- 38 |
>= 11,000 |
>= 12,000 |
|
N40 |
12,500 -- 12,800 |
38 -- 41 |
>= 11,000 |
>= 12,000 |
|
N42 |
12,800 -- 13,200 |
40 -- 43 |
>= 11,000 |
>= 12,000 |
|
N45 |
13,200 -- 13,700 |
43 -- 46 |
>= 11,000 |
>= 12,000 |
|
N48 |
13,800 -- 14,200 |
46 -- 49 |
>= 10,500 |
>= 12,000 |
|
N50 |
14,100 -- 14,500 |
48 -- 51 |
>= 10,500 |
>= 15,000 |
|
N52 |
14,400 -- 14,800 |
50 -- 53 |
>= 10,000 |
>= 15,000 |
Core Engineering Characteristics
Superior Magnetic Energy Density & Thermal Stability
Maximum Torque & Power Output: Sintered NdFeB offers the highest energy density among all commercial permanent magnetic materials.
Compact Footprint Design: Utilizing high grades (N48 to N52) allows design engineers to reduce component weight and housing volume in BLDC motors and magnetic actuators without reducing total magnetic flux output.
Thermal Demagnetization Protection: Heavy Rare Earth Elements (HREE) such as dysprosium (Dy) or terbium (Tb) are alloyed via Grain Boundary Diffusion (GBD) technology to maintain high intrinsic coercivity (Hcj) under heavy thermal loads.
Advanced Triple-Layer Ni-Cu-Ni Surface Protection
Sintered neodymium is porous and iron-rich, making it susceptible to moisture degradation without plating.
Inner Nickel Flash (3 -- 5 um): Delivers direct adhesion strength to the substrate.
Intermediate Copper (5 -- 10 um): Forms a ductile, non-porous barrier against moisture penetration.
Outer Bright Nickel (5 -- 10 um): Provides a clean, metallic finish resistant to mechanical wear and automated handling friction.
Corrosion Performance: Successfully passes 24 -- 96 h Neutral Salt Spray Testing (SST) and Pressure Cooker Testing (PCT).
Precision Machining & Tight Tolerances
Diamond Multi-Wire Slicing: Ensures smooth surface finish and razor-sharp edge definition.
Minimal Reluctance Gap: Tight geometric tolerances (+/-0.05 mm standard, +/-0.02 mm custom) guarantee zero-gap seating in precision rotor slots, sensor enclosures, and clamping jigs.
OEM Customization Capabilities
Custom Geometries: Rectangular slabs, blocks, countersunk/counterbored holes, slots, chamfers, or radiused corners.
Custom Magnetization: Through thickness, length, or width, as well as skewed or multi-pole magnetizing patterns.
Specialized Coatings: Epoxy (Black/Grey), Zinc (Zn), Gold (Au), or Parylene for medical, marine, or chemical processing environments.
Industrial Applications
Electric Motors & Generators: Rotor poles for brushless DC motors (BLDC), linear drive motors, servo actuators, and wind turbine alternators.
Sensors & Automation: High-reliability components for magnetic encoders, proximity switches, and Hall-effect sensor modules.
Industrial Holding & Separation: Heavy-duty clamping units, automated robotic grippers, and magnetic tramp-iron separators.
Electro-Acoustics & Medical: Precision driver units in specialized audio transducers, actuators, and medical device systems.
Manufacturing, Quality Assurance & Compliance
Vacuum Induction Melting & Jet Milling: Micro-alloyed raw materials are melted and pulverized into 3 -- 5 um microscopic particles.
Field Pressing & Sintering: Powders are aligned in high magnetic fields, cold-isostatically pressed (CIP), and sintered above 1000 deg.C in vacuum furnaces.
Multi-Stage Quality Inspection:
Magnetic Testing: Br, Hcb, Hcj, and (BH)max verified via Hysteresis Graph and Helmholtz Coils.
Dimensional Metrology: Inspected via CMM, digital micrometers, and optical comparators.
Coating Integrity: Checked via Salt Spray Test (SST) and automatic vision inspection systems for surface defects.
Global Regulatory Compliance: Fully certified under ISO9001 and IATF16949 quality management systems. 100% compliant with RoHS and REACH standards.
Export Packaging & Logistics Support
Air Freight Shielded Packaging: Fully insulated with iron sheets to meet IATA Packing Instruction 953 magnetic field emission requirements (<0.00525 Gauss at 15 feet).
Sea & Express Freight: Vacuum-sealed in anti-rust packaging with plastic separators between block magnets for safe handling during transit.
Production Lead Times:
Prototypes & Samples: 7 to 10 Days
Mass Production Orders: 15 to 25 Days
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