Sintered NdFeB Magnets

Sintered NdFeB magnets are the most high-performance permanent magnets to date, produced by the powder metallurgy process (powder making –magnetic field alignment compaction –vacuum sintering –aging heat treatment –machining –surface coating), they have a dense microstructure and exhibits excellent magnetic performance.

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Hard Magnetic Cores

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Core Features

Super-high magnetic properties

Maximum magnetic energy product: The (BH)max of high performance grades is typically 35-52 MGOe, with the maximum reaching up to 55 MGOe.
Ultra-high remanence: Normally greater than 1.2T, and some grades can exceed 1.4 T.
Highcoercivity: The Hcj range is extremely wide, from approximately12kOe for standard grades to over 30 kOe for high-coercivity grades.

Temperature properties and stability

Curie temperature: Relatively low, approximately 310C –380^oC, depending on the composition.
Operating temperature: The maximum operating temperature is one of its major drawbacks, and it typically varies by grade as below:
Series N：~80^oC；
Series M/H：~100^oC;
Series SH/UH：~150^oC
Series EH/AH：~180 - 200^oC or higher（reached by adding heavy rare earths）
Temperature coefficient: Thereversible temperature coefficient of remanence is relatively high (approximately-0.11%/^oC to -0.13%/^oC)

Mechanical and Physical Properties

Hard and brittle: Atypical brittle ceramic material with high hardness, but low tensile and flexuralstrength
High density: 7.4 –7.6 g/cm³, 1.3 times that of bonded NdFeB.
Lowelectrical resistivity:A good electrical conductor, and significant eddy current losses occur in alternating electric field, leading to heating and efficiency reduction.

Chemical Properties (Corrosion resistance)

Extremely susceptible to corrosion: Itsneodymium-rich phase and iron components are prone to rapid oxidation and electrochemical corrosion in humid air and alkaline environments.
Surface protection is mandatory: All sintered NdFeB magnets must undergo rigorous coating treatment prior to factory delivery.

Typical Applications

Sintered NdFeB magnet boasts ultimate magnetic properties, making it irreplaceablefor high-power density, high-efficiency and miniaturized applications. It is widely used in high-performance motors & generators (such as new energy vehicles, Industrial motors and wind turbines), consumer electronics, medical devices, industrial automation, robots and energy-efficient appliances.

Product Matrix

The magnetic properties matrix of sintered NdFeB magnet at 23℃±3℃

Series	Grade	Remanence		Coercivity		Max Magnetic Energy Product		Max work temperature	Density
		Br		Hcj		(BH) max		Max work temperature	Density
		T	kGs	KA/m	KOe	KJ/m3	MGOe	℃	g/cm3
N	N58	1.50-1.54	15.0-15.4	≥897	≥11	430-462	54-58	80	≥7.5
	N56	1.48-1.52	14.8-15.2	≥955	≥12	414-446	53-56	80	≥7.5
	N54	1.45-1.48	14.5-14.8	≥955	≥12	398-430	50-55	80	≥7.5
	N52	1.43-1.45	14.3-14.5	≥955	≥12	390-422	49-53	80	≥7.5
	N50	1.40-1..45	14.0-14.3	≥955	≥12	382-406	48-51	80	≥7.5
	N48	1.36-1.42	13.6-14.2	≥955	≥12	358-390	45-49	80	≥7.5
	N45	1.32-1.36	13.2-13.6	≥955	≥12	334-366	42-46	80	≥7.5
	N42	1.29-1.32	12.9-13.2	≥955	≥12	318-342	40-43	80	≥7.5
	N40	1.26-1.29	12.6-12.9	≥955	≥12	302-326	38-41	80	≥7.5
	N38	1.22-1.26	12.2-12.6	≥955	≥12	287-310	36-39	80	≥7.5
	N35	1.17-1.22	11.7-12.2	≥955	≥12	263-286.5	33-36	80	≥7.5
M	56M	1.48-1.52	14.8-15.2	≥1114	≥14	414-446	53-56	100	≥7.5
	54M	1.45-1.48	14.5-14.8	≥1114	≥14	398-430	51-55	100	≥7.5
	52M	1.43-1.45	14.3-14.5	≥1114	≥14	390-422	49-53	100	≥7.5
	50M	1.40-1.45	14.0-14.3	≥1114	≥14	374-406	47-51	100	≥7.5
	48M	1.36-1.42	13.6-14.2	≥1114	≥14	358-390	45-49	100	≥7.5
	45M	1.32-1.36	13.2-13.6	≥1114	≥14	342-366	43-46	100	≥7.5
	42M	1.29-1.32	12.9-13.2	≥1114	≥14	318-342	40-43	100	≥7.5
	40M	1.26-1.29	12.6-12.9	≥1114	≥14	302-326	38-41	100	≥7.5
	38M	1.22-1.26	12.2-12.6	≥1114	≥14	287-310	36-39	100	≥7.5
	35M	1.17-1.22	11.7-12.2	≥1114	≥14	263-286	33-36	100	≥7.5
	33M	1.14-1.17	11.4-11.7	≥1114	≥14	247-270	31-34	100	≥7.5
H	56H	1.48-1.52	14.8-15.2	≥1270	≥16	414-446	52-56	120	≥7.5
	54H	1.45-1.48	14.5-14.8	≥1270	≥16	398-430	51-55	120	≥7.5
	52H	1.43-1.45	1.43-1.45	≥1350	≥17	390-405	49-51	120	≥7.5
	50H	1.40-1.43	1.40-14.3	≥1350	≥17	374-405	47-51	120	≥7.5
	48H	1.36-1.40	13.6-14.0	≥1350	≥17	358-390	45-49	120	≥7.5
	45H	1.32-1.38	13.2-13.8	≥1350	≥17	335-366	42-46	120	≥7.5
	42H	1.29-1.32	12.9-13.2	≥1350	≥17	318-342	40-43	120	≥7.5
	40H	1.26-1.32	12.6-13.2	≥1350	≥17	302-326	38-41	120	≥7.5
	38H	1.22-1.26	12.2-12.6	≥1350	≥17	287-310	36-39	120	≥7.5
	35H	1.17-1.22	11.7-12.2	≥1350	≥17	263-286	33-36	120	≥7.5
	33H	1.14-1.17	11.4-11.7	≥1350	≥17	247-270	31-34	120	≥7.5
	30H	1.08-1.12	10.8-11.2	≥1350	≥17	223-239	28-30	120	≥7.5
	25H	0.90-0.93	9.0-9.3	≥1350	≥17	183-199	23-25	120	≥7.5
SH	54SH	1.45-1.48	14.5-14.8	≥1592	≥20	398-430	50-55	150	≥7.5
	52SH	1.43-1.45	1.43-1.45	≥1592	≥20	390-405	49-51	150	≥7.5
	50SH	L.38-1.42	13.8-14.2	≥1592	≥20	374-406	47-51	150	≥7.5
	48SH	L.36-1.39	13.6-13.9	≥1592	≥20	358-390	45-49	150	≥7.5
	45SH	13.3-13.6	13.3-13.6	≥1592	≥20	343-366	43-46	150	≥7.5
	42SH	L.29-1.32	12.9-13.2	≥1592	≥20	318-342	40-43	150	≥7.5
	40SH	1.26-1.29	12.6-12.9	≥1592	≥20	302-326	38-41	150	≥7.5
	38SH	1.22-1.26	12.2-12.6	≥1592	≥20	287-310	36-39	150	≥7.5
	35SH	1.17-1.22	11.7-12.2	≥1592	≥20	263-287	33-36	150	≥7.5
	33SH	1.14-1.17	11.4-11.7	≥1592	≥20	247-270	31-34	150	≥7.5
	30SH	1.08-1.12	10.8-11.2	≥1592	≥20	223-239	28-30	150	≥7.5
UH	52UH	1.43-1.45	14.3-14.5	≥1910	≥25	390-422	49-53	180	≥7.5
	5OUH	1.38-1.42	13.8-14.2	≥1990	≥25	374-406	47-51	180	≥7.5
	48UH	1.36-1.39	13.6-13.9	≥1990	≥25	358-390	45-49	180	≥7.5
	45UH	1.33-1.36	13.3-13.6	≥1990	≥25	342-366	43-46	180	≥7.5
	42UH	1.29-1.33	12.9-13.3	≥1990	≥25	318-342	40-43	180	≥7.5
	40UH	1.25-1.29	12.5-12.9	≥1990	≥25	302-326	38-41	180	≥7.5
	38UH	1.22-1.25	12.2-12.5	≥1990	≥25	287-310	36-39	180	≥7.5
	35UH	1.17-1.22	11.7-12.2	≥1990	≥25	263-286	33-36	180	≥7.5
	33UH	1.12-1.17	11.2-11.7	≥1990	≥25	247-271	31-34	180	≥7.5
	30UH	1.08-1.12	10.8-11.2	≥1990	≥25	223-247	28-31	180	≥7.5
EH	45EH	1.33-1.36	13.3-13.6	≥2388	≥30	342-366	43-46	200	≥7.5
	42EH	1.29-1.33	12.9-13.3	≥2388	≥30	318-342	40-43	200	≥7.5
	40EH	1.25-1.29	12.5-12.9	≥2388	≥30	302-326	38-41	200	≥7.5
	38EH	1.22-1.25	12.2-12.5	≥2388	≥30	287-310	36-39	200	≥7.5
	35EH	1.17-1.22	11.7-12.2	≥2388	≥30	263-287	33-36	200	≥7.5
	33EH	1.12-1.17	11.4-11.7	≥2388	≥30	247-271	31-35	200	≥7.5
	30EH	1.08-1.12	10.8-11.2	≥2388	≥30	223-247	28-31	200	≥7.5

Note:

1、Tw represents the operating temperature when L/D=0.7.

2、The temperature range for calculating the temperature coefficient is divided as: M-grade and below,△T: 20 ~ 100^oC;H-range and below, △T: 20 ~ 150^oC;

3、The conversion relationship of magnetic properties between SI and CGS unit systems: 1T= 10kGs, 1kOe=79.6Ka/m, MGOe=7.96kJ/m³;

4、The rounding of numerical values for product magnetic properties is conducted per GB/T8170.

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