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Sintered NdFeB Magnets

Sintered NdFeB Magnets
Sintered NdFeB Magnets


Sintered NdFeB

 

Sintered NdFeB Magnet Come out from the early 1980s. Its main component is Nd2Fe14B with

high magnetic performance. Because of bad anticorrosion, the surface of magnet need handling with various coating for some especial applications from various clients, such as Zn ,Ni, Au ,Epoxy so on.

Characteristics

1. It has higher magnetic performance. Its maximum energy density ----(BH)max is over 10 times as high as that of ferrite magnet.

2. it has good mechanical property, which is suitable for various processing, such as abrasive cutting, linear cutting and boring so on.

3. Its maximum working temperature can come up to 250 ℃,while it depends on the temperature more.

4. Because of bad anticorrosion, the surface of magnet need handling with various coating or electroplating for some especial applications.

Mechanical property of NdFeB Magnets

Items

 

Reference Value

Auxilliary magnetic properties

Br Reversable temperature coefficient (α(Br))/(%/K)

-0.08-0.12

Hcj Reversable temperature coefficient  (α(Hcj)/%/K)

-0.42-0.70

Curie temperature (Tc)/K

310380

Recoil Permeability (μrec) [ - ]

1.05

Mechanical physical properties

Density/(g/cm3)

7.507.70

Vickers Hardness (Hv)

650

Electrical resistance /(μΩ•m)

1.4

Compressive strength /MPa

1050

Tensile strength /MPa

80

Bending strength /MPa

290

Thermal Conductivity /(W/(m•K) )

68

Young's modulus/GPa

160

Thermal expansion (perpendicular to orientation direction)/(10-6/K)

-1.5

Thermal expansion (parellel to orientation direction)//(10-6/K)

6.5


Introduction to Coating of NdFeB magnets

Coatings

Thickness (µm)

Color

SST

PCT/HAST

Zn

5-15

Bright Blue

16-48

NiCuNi

10-30

Bright Silver

≧24-72

≧24-72

Ni+Sn

10-30

Silver

≧36-72

≧48

Ni+Au

10-30

Gold

≧12

≧48

Ni+Ag

10-30

Silver

≧12

≧48

Epoxy

10-30

Black/Grey

≧48

≧48

NiCu+Epoxy

20-40

Black/Grey

≧72

≧96

Vacuum Aluminium plating

5-30

Silver

≧96

≧96

Passivate/Phosphate

1-3

Dark Grey

Temporary Protection

Remarks                                                                                               1. For the same coating, magnets by barrel rolling plating will get better SST results than they're by rack plating. 

2. SST condition: 5% sodium choloride solution, 35℃ temperature, continuously spraying for a certain period of time.    

3. PCT condition: 2 atm, 95% relative humidity, 121℃, testing the bondability of plating. Zn, epoxy, phosphate platings do not under this test.   

4. Testing methods for quality of coating:  drop test, cut test, constant temperature and humidity test etc.             


Tolerance Range
 

方块形位公差控制标准

Block magnet

圆片形位公差控制标准

Block magnet

长度基本尺寸

Length Dimension(mm)

尺寸公差

Tolerance(mm)

垂直度

Perpendicularity

平行度

Parallelism(mm)

外径基本尺寸

Outer diameter(mm)

尺寸公差

Tolerance(mm)

圆度cylindricity

L≤10

±0.03

≤0.5°

0.03

D≤10

±0.03

0.03

10<L≤30

±0.05

≤0.5°

0.04

10<D≤30

±0.04

0.03

30<L≤50

±0.05

≤0.5°

0.05

30<D≤50

±0.05

0.05

L>50

±0.08

≤0.5°

0.08

D>50

±0.06

0.06

瓦型产品形位公差控制标准

Segment magnet

圆环产品形位公差控制标准

Ring magnet

名称

Name(mm)

基本尺寸Dimension(mm)

尺寸公差

Tolerance(mm)

内孔基本尺寸

Inner diameter(mm)

尺寸公差

Tolerance(mm)

同心度Coaxiality(mm)

壁厚

Wall thickness

T≤10

±0.04

D≤10

±0.04

0.06

10<T≤30

±0.05

10<D≤30

±0.05

0.08

30<T≤50

±0.06

30<D≤50

±0.06

0.1

长度 Length

L≤10

±0.04

50<D≤80

±0.08

0.12

10<L≤30

±0.05

D>80

±0.1

0.15

30<L≤50

±0.05

L>50

±0.08

宽度 Width

W<50

±0.05

W≥50

±0.08


Magnetic Property
 : 


烧结钕铁硼永磁材料性能


Prodution Process:

烧结钕铁硼生产工艺流程图

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