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Sintered Neodymium NdFeB Magnets

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Sintered Neodymium NdFeB Magnets

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Certification :	ISO9001
Price :	As negotiation
Delivery Time :	20-25days
Payment Terms :	T/T L/C
Supply Ability :	100 tons per month for NdFeB magnet

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Sintered Neodymium NdFeB Magnets

Introduction

Neodymium Iron Boron (NdFeB) or Neodymium magnets are extremely strong for their size. Shapes include rings, blocks, discs and custom.

To prevent unwanted oxidation, neodymium magnets are usually finished with a zinc, nickel or epoxy coating.

Manufacturing - In general, the elements are melted together and milled into a powder that is dry-pressed to shape in the presence of a magnetic field.

The material is then sintered, ground to dimension, magnetized and tested. They are called “rare earth” magnets because the elements of neodymium are classified as such in the lanthanides section of the Periodic Table of the Elements.

Physical Properties of Sintered Neodymium Magnet

Parameter Name	Parameter Values	Unit
Curie Temperature	310～380	℃
Relative Recoil Permeability	1.02～1.05
Reversible Temperature Coefficient of Br (20~100℃)	-0.09～-0.13	%/℃
Reversible Temperature Coefficient of Hcj (20~100℃)	-0.4～-0.7	%/℃
Density	7.50～7.70	g/cm³
Vickers Hardness	550～700
Bending Strength	-0.09～-0.13	MPa
Tensile Strength	≥80	MPa
Compressive Strength	800 ~1050	MPa
Electric Resistivity	150	μΩ·cm
Thermal Conductivity	8～10	W/(M·℃)
Coefficient of Thermal Expansion (Parallel to the orientation)	5	10^-6/K
Coefficient of Thermal Expansion (vertical to the orientation)	-1.5	10^-6/K
Young's Modulus	150～200	GPa
Specific Heat(20℃～320℃)	3.0～4.6	J/(g·k)
weight loss(low weight loss products)	≤2	mg/cm²

Magnetic Properties of Sintered Neodymium Magnet

Grade		Remanence		Coercivity		Intrinsic Coercivity		Max Energy Product		Working Temp
Grade		(Br)		(HcB)		(HcJ)		(BH)max		Tw
		KGs	T	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	℃
N Series	N35	11.7-12.2	1.17-1.22	≥10.9	≥868	≥12	≥955	33-36	263-287	≤80
	N38	12.2-12.5	1.22-1.25	≥11.3	≥899	≥12	≥955	36-39	287-310	≤80
	N40	12.5-12.8	1.25-1.28	≥11.4	≥907	≥12	≥955	38-41	302-326	≤80
	N42	12.8-13.2	1.28-1.32	≥11.5	≥915	≥12	≥955	40-43	318-342	≤80
	N45	13.2-13.8	1.32-1.38	≥11.6	≥923	≥12	≥955	43-46	342-366	≤80
	N48	13.8-14.2	1.38-1.42	≥11.6	≥923	≥12	≥955	46-49	366-390	≤80
	N50	14.0-14.5	1.40-1.45	≥10.0	≥796	≥11	≥876	48-51	382-406	≤60
	N52	14.3-14.8	1.43-1.48	≥10.0	≥796	≥11	≥876	50-53	398-422	≤60
M Series	35M	11.7-12.2	1.17-1.22	≥10.9	≥868	≥14	≥1114	33-36	263-287	≤100
	38M	12.2-12.5	1.22-1.25	≥11.3	≥899	≥14	≥1114	36-39	287-310	≤100
	40M	12.5-12.8	1.25-1.28	≥11.6	≥923	≥14	≥1114	38-40	302-326	≤100
	42M	12.8-13.2	1.28-1.32	≥12.0	≥955	≥14	≥1114	40-43	318-342	≤100
	45M	13.2-13.8	1.32-1.38	≥12.5	≥955	≥14	≥1114	43-46	342-366	≤100
	48M	13.6-14.3	1.36-1.43	≥12.9	≥1027	≥14	≥1114	46-49	366-390	≤100
	50M	14.0-14.5	1.40-1.45	≥13.0	≥1033	≥14	≥1114	48-51	382-406	≤100
	52M	14.3-14.8	1.43-1.48	≥13.0	≥995	≥14	≥1114	50-52	398-414	≤100
H Series	33H	11.3-11.7	1.13-1.17	≥10.6	≥844	≥17	≥1353	31-34	263-287	≤120
	35H	11.7-12.2	1.17-1.21	≥10.9	≥869	≥17	≥1353	33-36	263-287	≤120
	38H	12.2-12.5	1.22-1.25	≥11.3	≥899	≥17	≥1353	36-39	287-310	≤120
	40H	12.5-12.8	1.25-1.28	≥11.6	≥923	≥17	≥1353	38-41	302-326	≤120
	42H	12.8-13.2	1.28-1.32	≥12.0	≥955	≥17	≥1353	40-43	318-342	≤120
	45H	13.0-13.6	1.30-1.36	≥12.1	≥963	≥17	≥1353	43-46	326-358	≤120
	48H	13.7-14.3	1.37-1.43	≥12.5	≥955	≥17	≥1274	46-49	366-390	≤120
SH Series	30SH	10.8-11.3	1.08-1.13	≥10.1	≥804	≥20	≥1592	28-31	233-247	≤150
	33SH	11.3-11.7	1.13-1.17	≥10.6	≥844	≥20	≥1592	31-34	247-271	≤150
	35SH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥20	≥1592	33-36	263-287	≤150
	38SH	12.2-12.5	1.22-1.25	≥11.4	≥907	≥20	≥1592	36-39	287-310	≤150
	40SH	12.5-12.8	1.25-1.28	≥11.8	≥939	≥20	≥1592	38-41	302-326	≤150
	42SH	12.8-13.2	1.28-1.32	≥12.4	≥987	≥20	≥1592	40-43	318-342	≤150
	45SH	13.2-13.8	1.32-1.38	≥12.6	≥1003	≥20	≥1592	43-46	342-366	≤150
	48SH	13.7-14.3	1.37-1.43	≥12.6	≥1003	≥20	≥1592	46-49	366-390	≤150
UH Series	30UH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥25	≥1990	28-31	223-247	≤180
	33UH	11.3-11.7	1.13-1.17	≥10.7	≥852	≥25	≥1990	31-34	247-271	≤180
	35UH	11.7-12.2	1.17-1.22	≥10.8	≥860	≥25	≥1990	33-36	263-287	≤180
	38UH	12.2-12.5	1.22-1.25	≥11.0	≥876	≥25	≥1990	36-39	287-310	≤180
	40UH	12.4-12.8	1.24-1.28	≥11.3	≥915	≥25	≥1990	38-41	302-326	≤180
	42UH	12.8-13.2	1.28-1.32	≥11.3	≥971	≥25	≥1990	40-43	318-342	≤180
EH Series	30EH	10.8-11.3	1.08-1.13	≥10.2	≥812	≥30	≥2388	28-31	223-247	≤200
	33EH	11.3-11.7	1.13-1.17	≥10.5	≥836	≥30	≥2388	31-34	247-271	≤200
	35EH	11.7-12.2	1.17-1.22	≥11.0	≥876	≥30	≥2388	33-36	263-287	≤200
	38EH	12.2-12.5	1.22-1.25	≥11.3	≥899	≥30	≥2388	36-39	287-310	≤200
AH Series	30AH	10.2-10.8	1.02-1.08	≥10.1	≥804	≥35	≥2706	28-30	223-247	≤220
	33AH	11.4-11.7	1.14-1.17	≥10.6	≥844	≥35	≥2706	31-33	247-263	≤220
	35AH	11.7-12.1	1.17-1.21	≥10.9	≥876	≥35	≥2706	33-36	263-279	≤220

Max. working temperature for different grade

Grade		Working Temp
Grade		(L/D=0.7)
		℃
N Series	N35~N52	≤80
M Series	38M~50M	≤100
H Series	35H~48H	≤120
SH Series	33SH~48SH	≤150
UH Series	30UH~40UH	≤180
EH Series	30EH~38EH	≤200

Manufacturing process for magnets (outline)

Mixing	1.Mix the ingredients.
Melting	2.Dissolve the mixture at high temperature and prepare an alloy.
Fine pulverization	3.Turn the alloy into fine powder.
Molding in a magnetic field	4.When pressing the fine powder, apply a magnetic field to it and prepare a molded product of powder with aligned directions of magnetization.
Sintering and heat treatment	5.Sinter the product at about 1,100℃, and then subject it to heat treatment at about 600℃ to increase its magnetic characteristics.
Processing	6.Process the manufactured magnet base material and finish it into the product shape.
Surface treatment	7.Subject the product to surface treatment in order to make it rustproof.
Magnetization	8.Apply a magnetic field to give the magnet magnetism.

Application

Applications of Neodymium - Ideal for applications where a very high magnetic force is needed in a small area. Medical equipment,magnetic separators,linear actuators, microphone assemblies, servo motors, DC motors (automotive starters), computer rigid disc drives, printers and speakers are a few examples.

Other Characteristics

Tolearance Control

Name	Dimension(mm)	Tolerance(mm)
Wall thickness	T≤10	±0.04
	10<T≤30	±0.05
	30<T≤50	±0.06
Length	L≤10	±0.04
	10<L≤30	±0.05
	30<T≤50	±0.05
	L>50	±0.08
Width	W>50	±0.05
L>50	W≥50	±0.08

Available size: L≤200mm,W≤100mm,T: 1.5~50mm,H3~60mm

Physical Properties & Application to Environment of the Coating

Coating Material	Colour	Properties	Environment of Application	Thickness of Coating layer
Zinc	Blue, Black and rainbow etc	Compact, Stable and Homogeneous	With reasonalbe capability of anticorrosion	6um≤∮≤12
Nickel-Copper-Nickel	White and black	Light and Stable	Suitable for higher corrosive environment	15μm≤∮≤30pm
Phosphorization	Colorless or light gray	uniform thickness	short-term anticorrosion	-
Epoxy	Black and Gray	layer with certain luster, insurability	Suitable for higher corrosive environment	≥15μm
Parylene	transparency	uniform thickness, density pinholes-free and insurability	Excellent capability of anticorrosion especially for small items	0.1μm≤∮≤100pm
Ni+Cu+Epoxy	Black	Layer with certain luster	Excellent capability of	10-30μm
			anticorrosion. Suitable for
			hostile environment
			salt spray resistance>300hr
Al+Epoxy	Black	Layer with certain luster	Excellent capability of	15-35μm
			anticorrosion. Suitable for
			hostile environment
			salt spray resistance>650hr Widely used in new energy
			auto magnets

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