NdFeB

Tianhe Magnetics neodymium-iron-boron (NdFeB) permanent magnets are primarily composed of three elements: neodymium, iron, and boron. As the third generation of rare earth permanent magnets, they offer the highest magnetic performance currently available. They are characterized by high remanence, strong coercivity, and an excellent magnetic energy product.

Production Process Magnetic Properties Table Demagnetization Curve Surface Treatment

Product Introduction

Production Process

01

Raw Materials
02

Melting
03

Hydrogen Decrepitation
04

Jet Milling
05

Pressing
06

Sintering
07

Testing
08

Machining
09

Grain Boundary Diffusion (Optional)
10

Surface Treatment
11

Magnetization
12

Inspection & Shipping

Magnetic Properties Table

Magnetic Properties Table
Physical Properties
Parameters and Conversion Table

Item	Parameters	Reference Value
Additional magnetic properties	Temp.Coefft.of Br [(dB_r/B_r)]/(%/K)	-0.08~-0.12
	Temp.Coefft.of H_cj [(dH_cj/H_cj)]/(%/K)	-0.42~-0.70
	Curie Temperature (Tc)/℃	310-380
	Recoil Permeability (μ_rec)(-)	1.05
	Density (g/cm3)	7.45-7.7
Mechanical and Physical Properties	Vickers Hardness/(Hv)	650
	Electrical Resistivity/(μΩ·m)	1.4
	Compressive Strength/MPa	1050
	Tensile Strength/MPa	80
	Bending Strength/MPa	290
	Thermal Conductivity/[W/(m·K)]	6-8
	Young's Modulus/GPa	160
	Coefficient of Thermal Expansion (C⊥) / (10^-6/K)	-1.5
	Coefficient of Thermal Expansion (C∥) / (10^-6/K)	6.5

Demagnetization Curve

N35AH

N42EH

N45UH

N48EH

N52H

N52UH

N54M

N54SH

Surface Treatment

The neodymium iron boron (NdFeB) matrix is prone to corrosion. To overcome this flaw, surface protection treatment is required. Common methods include: phosphating, blue/white zinc, color zinc, nickel-copper-nickel, copper-nickel, zinc-nickel alloy, electrophoretic epoxy, sprayed epoxy, and nickel-copper + epoxy, among others.