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Brief Introduction of NdFeB Magnetic Materials

NdFeB permanent magnets are the strongest currently commercially available magnets. They have up to ten times higher energy densities in comparison to ferrites. The excellent magnetic properties of this material are due to the strongly magnetic matrix phase Nd₂Fe₁₄B with very high saturation polarization and high magnetic anisotropy. NdFeB magnets are commonly used in automotive applications, linear or servo motors, industrial applications and aviation.

Magnetic Material Properties Table

（Nd-Fe-B、SmCo）Standard Material performance Rare Earth Magnets (Nd-Fe-B, SmCo)

Demagnetization curve

Demagnetization curve of iron boron magnet (heavy rare earth diffusion process)

Grain boundary diffusion technology performance

Traditional sintering process grade table

Grade		Nomal	M	H	SH	UH	EH	AH
Br Reference (KG)	14.2~14.9	N-52	N-52M
	13.9~14.6	N-50	N-50M	N-50H
	13.6~14.3	N-48	N-48M	N-48H	N-48SH
	13.2~13.8	N-45	N-45M	N-45H	N-45SH	N-45UH
	12.8~13.4	N-42	N-42M	N-42H	N-42SH	N-42UH	N-42EH
	12.5~13.1	N-40	N-40M	N-40H	N-40SH	N-40UH	N-40EH	N-40AH
	12.1~12.7	N-38	N-38M	N-38H	N-38SH	N-38UH	N-38EH	N-38AH
	11.6~12.2	N-35	N-35M	N-35H	N-35SH	N-35UH	N-35EH	N-35AH
	11.3~11.8	N-33	N-33M	N-33H	N-33SH	N-33UH	N-33EH	N-33AH
	11.0~11.4	N-30	N-30M	N-30H	N-30SH	N-30UH	N-30EH	N-30AH
		≥ 12	≥ 14	≥ 17	≥20	≥25	≥30	≥ 33
		IHc Reference(kOe)

Grain Boundary Diffusion Process Grade Table

Grade		Nomal	M	H	SH	UH	EH	AH
Br Reference (KG)	14.2~14.9	N-52	N-52M
	13.9~14.6	N-50	N-50M	N-50H
	13.6~14.3	N-48	N-48M	N-48H	N-48SH
	13.2~13.8	N-45	N-45M	N-45H	N-45SH	N-45UH
	12.8~13.4	N-42	N-42M	N-42H	N-42SH	N-42UH	N-42EH
	12.5~13.1	N-40	N-40M	N-40H	N-40SH	N-40UH	N-40EH	N-40AH
	12.1~12.7	N-38	N-38M	N-38H	N-38SH	N-38UH	N-38EH	N-38AH
	11.6~12.2	N-35	N-35M	N-35H	N-35SH	N-35UH	N-35EH	N-35AH
	11.3~11.8	N-33	N-33M	N-33H	N-33SH	N-33UH	N-33EH	N-33AH
	11.0~11.4	N-30	N-30M	N-30H	N-30SH	N-30UH	N-30EH	N-30AH
		≥ 12	≥ 14	≥ 17	≥20	≥25	≥30	≥ 33
		IHc Reference(kOe)

Technical index of surface treatment

Magnetic property parameters and conversion table

Unit and symbol	International Unit	Unit conversion table
Flux density B	T (Tesla)	1T =1Vs/ m²= 10kGs
Polarization J	T (Tesla)	1T =1Vs/ m²= 10kGs
Magnetic field H	A/m	1kA/m³= 4πOe ≈ 12.570e
Energy density (BH) m	J/m³	1kJ/m³=0.126MGOe
Magnetic flux Ø	Wb(Weber)	1Wb = 1Vs = 10⁸Mx

Surface treatment index

Properties/Coatings	phosphating	zinc spray	Epoxy Coating	Ni/Ni Plating
Color	Grey	White	Black	Silver
Thickness (um)	＜3	10-30	10-30	10-20
PCT	--	12 hours	48 hours	48 hours
Salt spray test	1 hour	24 hours	96 hours	24 hours
Working temperature	--	<200 ℃	<200 ℃	<200 ℃