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NdFeB magnets -The Strongest Permanent Magnets Today

NdFeB(Neodymium-Iron-Boron) magnet is used most popular by people in industry and our daily life, because it has superior magnetic properties than other kind of magnets. The outstanding characteristics are as follows--------
·Higher unit magnetic properties than other magnet and assure you of smaller size and lighter weight in designing devices.
·Being mostly an iron based alloy, NdFeB type rare earth magnet is much more prone to surface oxidation or rust. To eliminate such a problem, the user should consider magnet coating, plating, or suitable surface treatment.
·Being less prone to chipping during handing
·Lower temperature coefficient of magnetic properties than ceramic but higher than SmCo type rare earth magnet. Therefore, this NdFeB type rare earth magnet will suffer irreversible loss at high temperature.

The permanent magnets, which are called the next centurial magnets, are used in a wide range of industries including computer, automobile, electric machinary, electro-sound devices, automatic control, magnetic force mechanism, microwave commnication, petrochemical industry, medical apparatus and equipment. The magnets are the ideal materials for the subminiature magnetic devices with high function.NdFeB magnets is especially suitable for developing those new products demanding high quality, small volume and light weight.

 


Surface Treatment Method:

Type Information
Metallic Zinc,Nickel,Nickel+Nickel,Copper+Nickel,Nickel+Copper+Nickel,Gold
Organic Epoxy,Nickel+Epoxy coating
Temporary Surface Pssivation

Produce Flow Chart:


Sintered NdFeB Magnets
MAGNETIC AND PHYSICAL CHARACTERISTICS:

TYPE
Remanence Br
Coercivforce bHc
Intrinsic coercive force iHc
Max. energy product (BH) max
Working Temperature
KGs
T
KOe
KA/m
KOe
KA/m
MGOe
KJ/m3
0C
3 N-35
11.7-12.1
1.77-12.1
10.8-11.5
860-915
=12
=955
33-35
263-279
=80
4 N-36
11.9-12.2
1.19-1.22
11.0-11.4
876-907
=12
=955
34-36
271-287
=80
5 N-38
12.4-12.6
1.24-1.26
11.4-11.5
907-915
=12
=955
37-38
295-303
=80
6 N-40
12.7-12.9
1.27-1.29
10.5-11.0
915-923
=12
=955
39-40
310-318
=80
7 N-42
13.0-13.3
1.30-1.33
10.0-10.5
796-836
=12
=955
40-42
318-334
=80
8 N-43
13.0-13.3
1.30-1.33
10.5-11.0
836-876
=12
=955
41-43
326-342
=80
9 N-45
13.3-13.7
1.33-1.37
10.5-11.0
836-876
=12
=965
43-45
358-342
=80
10 N-48
13.7-14.0
1.37-1.40
10.5-11.0
836-876
=12
=965
47-51
374-390
=80
11 N-50
14.0-14.6
1.40-1.46
10.5-11.0
836-876
=12
=965
47-51
358-390
=80
12 N-27M
10.2-10.6
1.02-1.06
9.6-10.1
764-804
=15
=1194
25-27
199-215
=100
13 N-30M
10.8-11.2
1.08-1.12
10.1-10.6
804-844
=15
=1194
28-30
223-239
=100
14 N-33M
11.4-11.7
1.14-1.17
10.5-11.1
844-884
=15
=1194
31-33
247-263
=100
15 N-35M
11.7-12.1
1.17-1.21
10.8-11.5
860-915
=15
=1114
33-35
263-279
=100
16 N-36M
11.9-12.2
1.19-1.22
11.1-11.6
884-923
=15
=1194
34-36
271-287
=100
17 N-38M
12.2-12.6
1.22-1.26
10.8-11.5
860-915
=14
=1114
36-38
287-303
=100
18 N-40M
12.6-12.9
1.26-1.29
10.8-11.5
860-915
=14
=1114
38-40
303-318
=100
19 N-42M
13.0-13.3
1.30-1.33
10.8-11.4
860-907
=14
=1114
40-42
318-334
=100
20 N45M
13.3-13.7
1.33-1.37
10.8-11.4
860-907
=17
=1114
43-45
334-358
=100
21 N-27H
10.2-10.6
1.02-1.06
9.6-10.1
764-804
=17
=1353
25-27
199-215
=120
22N-30H
10.8-11.2
1.08-1.12
10.1-10.6
804-844
=17
=1353
8-30
223-239
=120
23 N-33H
11.4-11.7
1.14-1.17
10.6-11.1
844-884
=17
=1353
31-33
247-263
=120
24 N-35H
11.7-12.1
1.17-1.21
10.8-11.5
860-915
=17
=1353
33-35
263-279
=120
25 N-36H
11.9-12.2
1.19-1.22
11.1-11.6
884-923
=17
=1353
34-36
271-287
=120
26 N-38H
12.2-12.6
1.22-1.26
11.5-12.0
915-955
=17
=1353
30-36
287-303
=120
27 N-40H
12.6-12.9
1.26-1.29
11.5-12.0
915-955
=17
=1353
38-40
303-318
=120
28N-27SH
10.2-10.6
1.02-1.06
9.6-10.1
764-804
=20
=1592
25-27
199-215
=150
29N-30SH
10.8-11.2
1.08-1.12
10.1-10.6
804-844
=20
=1592
28-30
223-239
=150
30N-33SH
11.4-11.7
11.4-11.7
10.6-11.1
844-884
=20
=1592
31-33
247-263
=150
31N-35SH
11.7-12.1
1.17-1.21
10.8-11.5
860-915
=20
=1595
33-35
263-279
=150
32N-38SH
12.1-12.5
1.21-1.25
10.8-11.5
860-915
=20
=1592
36-38
287-302
=150
31N25UH
9.8-10.2
0.98-1.02
9.2-9.6
732-764
=25
=1990
23-25
183-199
=180
32N28UH
10.4-10.8
1.04-1.08
9.8-10.2
780-812
=25
=1990
26-28
207-223
=180
33N30UH
10.8-11.2
1.08-1.12
10.1-10.6
804-844
=25
=1990
28-30
223-239
=180
34N35UH
11.7-12.1
1.17-1.21
10.5-11.2
836-890
=25
=1989
33-35
263-278
=180
35N38UH
12.2-12.6
1.22-1.26
11.7-12.0
930-955
=25
=1989
33-38
280-302
=180
36N30EH
10.8-11.2
1.08-1.12
10.1-10.6
804-844
=30
=2229
28-30
223-239
=200
37N33EH
11.4-11.7
1.14-1.17
10.4-11.0
844-876
=30
=2229
30-33
247-263
=200
38N35EH
11.7-12.1
1.17-1.21
10.8-11.5
860-915
=30
=2229
33-35
263-279
=200

 

Bonded NdFeB Magnets
Bonded NdFeB magnets are manufactured by binding rapid-quenching NdFeB powder. The powder is mixed with resin to form a magnet by compression molding with epoxy or infection molding with nylon. The latter technique is particular effective in large volume production, though the magnetic value of products is lower than lower than those made with compression molding because of their relatively lower density. Various shapes of high dimensional accuracy can be produced without further processing. Surface is treated by epoxy coating or nickel-plating to prevent corrosion .

Advantages of Bonded Magnets
·Produced with high efficiency, stability and repeatability.
·Magnet and other part may form together in one step.
· Free choice of magnetizing direction-especially for multi-polar applications
· High dimensional accuracy-large quantity applications with minimum post-press machining.
· Thin-wall ring and complex shape magnets.
· High resistance to corrosion.

MAGNETIC AND PHYSICAL CHARACTERISTICS:

Performance

B r T(Gs)

H CB kA/m(kOe)

H CJ kA/m(kOe)

(BH) max kJ/m 3 (MGOe)

D g/cm 3

μ r

α（ B r ） %/ ℃

T w ℃

BN-6

0.55-0.62

285-370 (3.6-4.6

600-755 (7.5-9.5

44-56 (5.5-7)

5.5-6.1

1.15

-0.13

100

BN-8L

0.60-0.64

360-400 (4.5-5.0)

715-800 (9-10)

56-64 (7.0-8.0)

5.6-6.1

1.15

-0.13

110

BN-8

0.62-0.69

385-445 (4.8-5.6)

640-800 (8-10)

64-72 (8.0-9.0)

5.8-6.1

1.15

-0.13

120

BN-8SR8

0.62-0.66

410-465 (5.2-5.8)

880-1120 (11-14)

64-72 (8.0-9.0)

5.8-6.1

1.13

-0.13

150

BN-8H

0.61-0.65

410-455 (5.2-5.7)

1190-1440 (15-18)

64-72 (8.0-9.0)

5.9-6.2

1.15

-0.07

125

BN-9

0.65-0.70

400-440 (5.0-5.5)

640-800 (8-10)

70-76 (8.8-9.5)

5.8-6.1

1.22

-0.12

120

BN-10

0.68-0.72

420-470 (5.3-5.9)

640-800 (8-10)

76-84 (9.5-10.5)

5.8-6.1

1.22

-0.11

120

BN-11

0.70-0.74

445-480 (5.6-6.0)

680-800 (8.5-10)

80-88 910.0-11.0)

5.8-6.1

1.22

-0.11

120

BN-11L

0.70-0.74

400-440 (5.0-5.5)

520-640 (6.5-8)

78-84 (9.8-10.5)

5.8-6.1

1.26

-0.11

110

BN-12L

0.74-0.80

420-455 (5.3-5.7)

520-600 (6.5-7.5)

84-92 (10.5-11.5)

5.8-6.1

1.26

-0.08

110

QUALITY CONTROL AND PROCESS:
Quality test: Salt-Spray test /Magnetic Flux test/ Coating layer thickness test/ Magnetic Properties tes
NO

PROCESS

NAM

 EQUIPMENT CONTROL POINT CONTROL METHOD
ITEMS FOR INSPECTION STANDARD PREQUENCY INSTRUMENT USED RECORD DOCUMENT IN-CHARGE
1

Purchase

Raw Material

  

1.Name,Amount,Order No,

2.Composition , Appearance

Purchase Document

Inspection Standard

ALL

2Pcs Per Load

Visual

ICP or Chamical Analyse

 Material Inspection Sheet Technician
2
 Burden Electric Balance

1.Weight

2.Appearance

 Burden Production Guide

ALL

ALL

 Electric Balance Visual Burden Record Opreator
3
 Melting Vacuum Mclting Furnace

1.Powder Size

2.Oxygen Conteat

 Inspection Standard

Ipcs/Furnace/week

ALL

Icp or Chamical

Visual

Inspection Sheet

Quality Record

 Technician
4

Smash &

let Milling

Smash Machine

Let Mill

1.Powder Size

2.Oxygen Conten

 Milling Production Guide

ITimes/Day/Machine

Per Load

FSSS

Oxygen Determinator

 Powder Size Record

Technician

Technician
5
 Pressing

Press

1.Heigh

2.Press

3.Weight

Pressing Production Guide

5% Per Load

ALL

ALL

Callipers

Press Meter

Balance

 Produce process Sheet(3) Opreator
6

Sintering&Tempering

 Vacuum Furnace

1.Sintering time

2.Sintering Temperature

Sintering &Tempering

Production Guide

 Per Furnace Vacumn Furnace Produce process Sheet(3) Operator
7
 Inspection

B-H Curves

Measurement

Magnetizer

1.Br,JHc,(BH)max

2.Magnetic Property

3.De-Magnetiz Volt

4.Appearance

Company Standard

Inspection Standard

SPcs Per Load

I[/AQL=0.1

I[/AQL=0.1

ALL

SPcs Per Load

I[/AQL=0.1

I[/AQL=0.1

ALL

Stntering Produce

Test Sheet

 inspection
8
 Mashining

Grinder

slicer

Electric Spark

Machining

Magactizer

 1.Dimentions

2.Appearance tolerance

3.orientation

4.Magnetic property

5.Appearance

Inspection Standard

II[/AQL=0.1

III/AQL=0.1

III

S-4/AQL=0.1

III/AQL=0.1

Callipers

Callipers

Magneted Material

Gaussmeter or Fluxmeter

Visual

 Produce Inspection sheet Inspection
9
 Plating Plating Vat

1.After Plating Dimensions

2.Appearance

3.Plating Tickness

 Inspection Standard

S-4/AQL=0.1

S-4/AQL=0.1

5Pcs Per Load

Callipers

Visual

Thickness Determinator

Produce Inspection sheet

Thickness Record

Inspection

Technician
10

Final

Inspection

 Magaetizer

1.Dimentions

2.Apperarance Tolerances

3.Orientatioa

4.Megnetic property

5.Appearance

 Inspection Standard

II/AQL=0.1

S-4/AQL=0.1

S-4

S-4/AQL=0.1

ALL

Callipers

Callipers

Magneted Material

Oaussmeler or Fluxmeter

Visual

 Final Inspection Record Inspection
11
 Packing Packer

1.Quantity

2.Label

 Inspection Standard

ALL

ALL

Visual

Visua

 Enter Store Sheet Opreator

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