Sintered Neodymium Iron Boron (NdFeB) Magnets

ContentsCharacteristic magnetic properties at room temperature (20°C)

Remarks on table

Physical properties at room temperature (20°C)

1

2

N35N38N40N42N45N48N50N52N33MN35MN38MN40M

N42MN45MN48MN50MN30HN33HN35HN38HN40HN42HN44HN46H

N48HN30SHN33SHN35SHN38SHN40SHN42SHN44SHN46SHN28UHN30UHN33UH

N35UHN38UHN40UHN28EHN30EHN33EHN35EHN38EHN25AHN28AHN30AHN25BH

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

Demagnetisation curves

Page No. Magnet grade Page No. Magnet grade Page No. Magnet grade Page No. Magnet grade

1

N35N38N40N42N45N48N50N52N33MN35MN38MN40MN42MN45MN48MN50MN30HN33HN35HN38HN40HN42HN44HN46HN48HN30SHN33SHN35SHN38SHN40SHN42SHN44SHN46SHN28UHN30UHN33UHN35UHN38UHN40UHN28EHN30EHN33EHN35EHN38EHN25AH

N28AH

N30AH

N25BH

Grade

8080808080807070

100100100100100100

9090

120120120120120120120120120150150150150150150150150180180180180180180200200200200200220

220

220

230

Max. operating

temp.

min11701220126013001330137014101440114011701220126013001330137014101080114011701220126013001330136013801080114011701220126013001330136010401080114011701220126010401080114011701220

970

1040

1080

950

typ122012601300133013701410144014701170122012601300133013701410144011401170122012601300133013601380141011401170122012601300133013601380108011401170122012601300108011401170122012601020

1080

1140

1000

RemanenceBRmT

min870870870870900900830830830870900930950980

10101030

810830870900930950970980

1010810830870900930950970980770810830870900930770810830870900730

770

810

710

typ920920920920930930850850880920950980

1000103010601080

860880920950980

1000102010401060

860880920950980

100010201040

810860880920950980810860880920950770

810

860

750

Normal coercivityHcb

kA/m

min263279303318334358382398239263279303318334358382223239263279303318334350366223239263279303318334350199223239263279303199223239263279180

203

220

170

typ279303318334358382398414263279303318334358382398239263279303318334350366382239263279303318334350366223239263279303318223239263279303200

218

250

190

Mass energy productBH(max)kJ/m3

min955955955955955955875875

1114111411141114111411141114111413531353135313531353135313531353135315921592159215921592159215921592198919891989198919891989238723872387238723872787

2787

2787

3000

Intrinsic coercivity

HcjkA/m

Sintered NdFeB magnetsCharacteristic magnetic properties at room temperature (20°C)

iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m

iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m

iHc at 150°C, min. 1200KA/miHc at 180°C, min. 900KA/m

iHc at 150°C, min. 1300KA/miHc at 180°C, min. 950KA/m

2

Remarks on facing table

1 The max working temperature is only for reference, it is dependent on the circuit in which the magnet is operating.

2 Customers are advised to consult us on any application involving temperatures near to 150°C.

3 When L/D = 0.7, the magnet can be operated at maximum working temperature before irreversable losses occur.

Temp. Coeff. Of Br −0.11%/°C

Density 7.5/cm³

Vickers Hardness 600Hv

Tensile Strength 8.0kg/mm²

Specific Heat 0.12 kcal/(kg,°C)

Young's Modulus 1.6 × 10¹¹N/m²

Poisson's Ratio 0.24

Curie Temperature 310–340°C

Temp. Coeff of iHc −0.60%/°C

Electrical Resistivity 144 μΩ.cm

Flexural Strength 25kg/mm

Coeff. Of Thermal Expansion 4×10–6/°C

Thermal Conductivity 7.7 kcal/(m.h. °C)

Rigidity 0.64N/m²

Compressibility 9.8 × 10–¹²m²/N

Physical properties at room temperature (20°C)

3

Demagnetisation curves

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Demagnetisation curves

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Demagnetisation curves

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9

Demagnetisation curves

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11

Demagnetisation curves

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13

Demagnetisation curves

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15

Demagnetisation curves

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Demagnetisation curves

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Demagnetisation curves

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Demagnetisation curves

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Demagnetisation curves

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Demagnetisation curves

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Eclipse Magnetics LtdAtlas Way, Atlas North, Sheffield, S4 7QQ, EnglandT +44 (0)114 225 0600 F +44 (0)114 225 0610 sales@eclipse-magnetics.co.uk www.eclipse-magnetics.co.uk