Product Overview
N35 neodymium magnets are sintered NdFeB permanent magnets featuring a nominal maximum energy product of 35 MGOe. They are specified for industrial, motor, sensor, and OEM component applications where a reliable permanent magnetic field is required, but the highest available magnetic grade is not necessary.
For industrial procurement, grade selection is only one component of the specification. Finished performance depends on the interaction between magnetic grade, installation geometry, operating temperature, surface protection, and magnetic circuit design.
N35 NdFeB Magnet Technical Specifications
|
Parameter |
Specification Details |
|
Material System |
Sintered Neodymium-Iron-Boron (NdFeB) |
|
Material Grade |
N35 |
|
Nominal Maximum Energy Product |
33–36 MGOe (263–287 kJ/m³) |
|
Available Geometries |
Disc, ring, block, arc, segment, and custom customer drawings |
|
Magnetization Options |
Axial, diametrical, radial, multi-pole, or application-specific |
|
Surface Protection |
Ni-Cu-Ni, epoxy, zinc, and alternative coatings matched to environment |
|
Dimensional Tolerance |
Manufactured to drawing requirements and agreed standards |
|
Primary Production Route |
Powder preparation, magnetic-field pressing, sintering, machining, coating, and final magnetization |
Understanding N35 Material Characteristics
Energy Product Range: The number 35 represents the approximate maximum energy product, allowing engineers to compare baseline magnetic capabilities across different NdFeB grades.
Grade Positioning: N35 offers lower magnetic energy than higher commercial grades such as N42, N48, or N52. However, lower grade does not equate to inferior quality.
Cost-Performance Balance: If an application's required magnetic flux can be met using N35, selecting this grade often provides a more cost-effective material choice without oversizing the magnetic circuit.
Circuit Design: Grade selection should be evaluated based on the air gap, flux requirements, and physical envelope rather than choosing a higher grade by default.
Typical Industrial Applications
Arc and segment magnets integrated into rotors where magnetic circuit parameters align with N35 flux capabilities.
Disc and block magnets providing stable magnetic fields for position switching and feedback loops.
Holding, clamping, and coupling devices utilizing calculated magnetic attraction forces.
Actuators and positioning mechanisms requiring consistent magnetic properties across production batches.
Thermal Behavior & Operating Limits
Standard N35 magnets have a maximum recommended working temperature typically around 80°C. Operating near or above this threshold without proper evaluation can lead to irreversible thermal demagnetization.
Intrinsic Coercivity: N35 features a standard coercivity profile. If thermal spikes or continuous elevated temperatures are expected, higher-grade families (such as M, H, SH, UH, or EH) must be utilized instead.
Magnetic Circuit Impact: Operating temperature affects remanence. Engineering designs must factor in thermal coefficients during the magnetic simulation stage.
Manufacturing and Quality Control
Production Workflow
The manufacturing route for sintered N35 components involves raw material melting, hydrogen decrepitation, jet milling, magnetic-field alignment pressing, sintering, heat treatment, precision machining, surface coating, and final pulse magnetization.
Inspection Standards
Industrial quality control extends beyond visual appearance. Depending on project requirements, inspection plans can cover:
- Magnetic Testing: Verification of remanence, coercivity, and maximum energy product via hysteresis graph or flux meter.
- Dimensional Verification: Inspection of length, thickness, diameter, and arc radius against engineering drawings using calibrated measuring tools.
- Surface Integrity: Evaluation of coating thickness, adhesion, and coverage to ensure environmental resistance.
Packaging, Compliance & Export Logistics
Rare-earth permanent magnets require specialized industrial handling for international transit:
Magnetic Shielding: Packaged with iron sheets or air-gap spacers to neutralize stray magnetic fields, complying with international air and ocean freight safety standards.
Corrosion Prevention: Vacuum-sealed barrier packaging with desiccants to prevent oxidation during maritime shipping.
FAQ
Q: What is the maximum operating temperature for standard N35 magnets?
A: Standard N35 neodymium magnets have a maximum recommended working temperature of approximately 80 degrees Celsius. Operating continuously above this threshold requires higher temperature-rated grades such as M, H, SH, UH, or EH to prevent irreversible magnetic loss.
Q: Can N35 magnets be machined after final sintering and magnetization?
A: No. Sintered neodymium material is extremely hard and brittle. All cutting, slicing, drilling, and grinding must be performed using diamond tooling prior to the final surface coating and magnetization stages.
Q: What is the difference between axial and diametrical magnetization in disc magnets?
A: Axial magnetization creates magnetic poles on the flat circular faces of the disc. Diametrical magnetization places the North and South poles across the curved outer diameter perpendicular to the central axis.
Q: Why is surface coating required for N35 sintered neodymium magnets?
A: Neodymium-iron-boron alloys contain high concentrations of unalloyed neodymium, which oxidizes rapidly when exposed to ambient moisture. Protective coatings such as nickel-copper-nickel or epoxy prevent atmospheric corrosion and surface degradation.
Hot Tags: n35 neodymium magnets, China n35 neodymium magnets manufacturers, suppliers, factory, Alnico 4 Cast Magnet, Alnico 4 Sintered Magnet, magnet for mri machines, magnet for pharmaceutical industry, magnet for sample shaped magnets, magnetic stickers