Neodymium Magnets

Description

Neodymium magnet is mainly made from the alloy of neodymium, iron and boron. It is a kind of rare earth magnet which is most widely used. In Nd₂Fe₁₄B tetragonal crystalline structure, it is also called NdFeB magnet or NIB magnet. It is the strongest type of permanent magnet made so far, so neo magnet is known as the king of magnets and widely utilized in various fields. They may be either sintered ones or bonded ones.

Types

1. Sintered Neodymium Magnet
2. Bonded Neodymium Magnet

Shapes

1. These magnets are featured by small size, metallic appearance and simple shapes such as rings, blocks and discs.
2. We can customize NdFeB magnets according to customers’ requests.
Choose Neodymium Magnet from Following Shapes

Square Neodymium Magnets

Disc Neodymium Magnets

Custom Neodymium Magnets

Applications

NdFeB magnets are widely applied in aviation field, aerospace field, electronic industry, electrical industry, mechanical industry, instrument manufacturing, transportation industry, medical field, commodity industry, etc. Exactly speaking, they are used in machineries which are equipped with magnetic devices.

Manufacturing Process of Neodymium Magnet

Mill neodymium, iron, boron and transition metals into NdFeB powder, then compact the powder into desirable shape. Next, sinter the compacted powder and melt it. Cool down the melted metal, you will find it becomes a solid metal item. Then, conduct finish machining on the metal item. There are two forms for pressing: die pressing and isostatic pressing.

Maintenance of NdFeB Magnet

DO NOT place neodymium magnets in following environments to prevent them from rusting or reducing magnetic performance.
1. Acid or Alkali Liquor
2. Organic Solvent
3. Electrolyte
4. Water or Oil
5. Hydrogen
6. Active Gas like Chlorine, Ammonia, Oxynitride
7. Radiation or Radioactive Rays

Package and Delivery of Neodymium Magnet

1. NIB magnet is packaged in cartons.
2. During transportation, handle the cargo with care. Besides, the cargo should be shockproof, rainproof and be placed in ventilated, dry, no-erosion environment.
3. Deliver cycle is about 20 days.

Physical Properties of NdFeB Magnet

Property	Specification
Hardness	570 HV
Resistivity	150 μΩ·cm (10℃-120℃)
Compressive Strength	780 N/mm2
Thermal Expansivity (Vertical to Reference Direction)	-4.8 × 10-6 K
Thermal Expansivity (Parallel to Reference Direction)	3.4 × 10-6 K

Size Specifications of Neodymium Magnet

Ring Shape	Outer Diameter	Inner Diameter	Thickness	Disc Shape	Diameter	Thickness
Max.	100.00 mm	80.00 mm	30.00 mm	Max.	50.00 mm	20.00 mm
Min.	2.60 mm	1.80 mm	0.50 mm	Min.	1.20 mm	0.50 mm
Tolerance	+/-0.1 mm	+/-0.1 mm	+/-0.1 mm	Tolerance	+/-0.1 mm	+/-0.1 mm
Square Shape	Length	Width	Thickness	Customized Shapes
Max.	80.00 mm	80.00 mm	30.00 mm
Min.	2.00 mm	1.50 mm	0.50 mm	According to Samples or Design Data
Tolerance	+/-0.1 mm	+/-0.1 mm	+/-0.1 mm

Max. Working Temperature of Neodymium Magnet

Type	Max. Working Temperature (Pc=1)
N	80 ℃
M	100 ℃
H	120 ℃
SH	150 ℃
UH	180 ℃
EH	200 ℃

Surface Treatment of NIB Magnet

Item	Specification
Metal	Zn, Ni, Ag, Au
Organic Substance	Epoxy Resin Spraying, Ni and Epoxy Resin Spraying
	Surface Passivation

Magnetization Directions of Neodymium Magnet
a. Thickness Magnetized
b. Axially Magnetized
c. Diametrally Magnetized
d. Multi-poles Magnetized
e. Radially Magnetized
f. Customized Specific Requirements Magnetized

Magnetic Properties of Neodymium Magnet

Grade	Remanence		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product		Temperature	Density
	Br		Hcb		Hcj		(BH) Max.		Tw	ρ
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m3	MGOe	℃	g/cm3
N35	1.17-1.22	11.7-12.2	≥859	≥10.8	≥955	≥12	263-287	33-36	≤80	≥7.4
N38	1.22-1.26	12.2-12.6	≥859	≥10.8	≥955	≥12	287-303	36-38	≤80	≥7.5
N40	1.26-1.29	12.6-12.9	≥836	≥10.5	≥955	≥12	303-318	38-40	≤80	≥7.5
N42	1.29-1.32	12.9-13.2	≥836	≥10.5	≥955	≥12	318-342	40-43	≤80	≥7.5
N45	1.32-1.37	13.2-13.7	≥836	≥10.5	≥955	≥12	342-359	43-45	≤80	≥7.5
N48	1.36-1.42	13.6-14.2	≥836	≥10.5	≥955	≥12	358-382	45-49	≤80	≥7.5
N50	1.40-1.45	14.0-14.5	≥836	≥10.5	≥955	≥12	374-406	47-51	≤80	≥7.5
N52	1.42-1.48	14.2-14.8	≥836	≥10.5	≥876	≥11	389-422	49-53	≤80	≥7.5
N30M	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1114	≥14	223-247	28-31	≤100	≥7.5
N33M	1.14-1.17	11.4-11.7	≥852	≥10.7	≥1114	≥14	247-263	31-33	≤100	≥7.5
N35M	1.17-1.22	11.7-12.2	≥876	≥11.0	≥1114	≥14	263-287	33-36	≤100	≥7.5
N38M	1.22-1.26	12.2-12.6	≥916	≥11.5	≥1114	≥14	287-303	36-38	≤100	≥7.5
N40M	1.26-1.29	12.6-12.9	≥939	≥11.8	≥1114	≥14	303-318	38-40	≤100	≥7.5
N42M	1.29-1.32	12.9-13.2	≥955	≥12.0	≥1114	≥14	318-334	40-42	≤100	≥7.5
N45M	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1114	≥14	334-366	42-46	≤100	≥7.5
N48M	1.36-1.42	13.6-14.2	≥1018	≥12.8	≥1114	≥14	358-390	45-49	≤100	≥7.5
N50M	1.39-1.45	13.9-14.5	≥1050	≥13.2	≥1114	≥14	374-406	47-51	≤100	≥7.5
N30H	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1353	≥17	223-247	28-31	≤120	≥7.5
N33H	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1353	≥17	247-263	31-33	≤120	≥7.5
N35H	1.17-1.22	11.7-12.2	≥875	≥11.0	≥1353	≥17	263-287	33-36	≤120	≥7.5
N38H	1.22-1.26	12.2-12.6	≥916	≥11.6	≥1353	≥17	287-303	36-38	≤120	≥7.5
N40H	1.26-1.29	12.6-12.9	≥939	≥11.8	≥1353	≥17	303-318	38-40	≤120	≥7.5
N42H	1.29-1.32	12.9-13.2	≥955	≥12.0	≥1353	≥17	318-334	40-42	≤120	≥7.5
N45H	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1353	≥17	334-366	42-46	≤120	≥7.5
N48H	1.36-1.42	13.6-14.2	≥1026	≥12.9	≥1273	≥16	358-390	45-49	≤120	≥7.5
N30SH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1592	≥20	223-247	28-31	≤150	≥7.5
N33SH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1592	≥20	247-263	31-33	≤150	≥7.5
N35SH	1.17-1.22	11.7-12.2	≥876	≥11.0	≥1592	≥20	263-287	33-36	≤150	≥7.5
N38SH	1.22-1.26	12.2-12.6	≥899	≥11.3	≥1592	≥20	287-303	36-38	≤150	≥7.5
N40SH	1.26-1.29	12.6-12.9	≥931	≥11.7	≥1592	≥20	303-318	38-40	≤150	≥7.5
N42SH	1.29-1.32	12.9-13.2	≥963	≥12.1	≥1592	≥20	318-334	40-42	≤150	≥7.5
N44SH	1.30-1.36	13.0-13.6	≥995	≥12.3	≥1592	≥20	326-359	41-45	≤150	≥7.5
N30UH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥1990	≥25	223-247	28-31	≤180	≥7.5
N33UH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥1990	≥25	247-263	31-33	≤180	≥7.5
N35UH	1.17-1.22	11.7-12.2	≥875	≥11.0	≥1990	≥25	263-287	33-36	≤180	≥7.5
N38UH	1.22-1.26	12.2-12.6	≥915	≥11.5	≥1990	≥25	287-302	36-38	≤180	≥7.5
N40UH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1990	≥25	302-334	38-42	≤180	≥7.5
N30EH	1.08-1.14	10.8-11.4	≥812	≥10.2	≥2388	≥30	223-247	28-31	≤200	≥7.5
N33EH	1.14-1.17	11.4-11.7	≥851	≥10.7	≥2388	≥30	247-263	31-33	≤200	≥7.5
N35EH	1.17-1.25	11.7-12.5	≥875	≥11.0	≥2388	≥30	263-295	33-37	≤200	≥7.5
N38EH	1.22-1.29	12.2-12.9	≥907	≥11.4	≥2388	≥30	287-318	36-40	≤200	≥7.5
N30AH	1.08-1.20	10.8-12.0	≥860	≥10.8	≥2626	≥33	247-263	31-35	≤220	≥7.5