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Address:No. 249 West Xianmu Road, Huzhen Town, Jinyun County, Lishui, Zhejiang China
Zip Code:321404
TEL: +86-578-3272111
FAX:+86-578-3263799
E-mail: sales@cnlishuai.com

Complaints:Loonge Zhang
E-mail:loonge@cnlishuai.com

Ceramic Magnets



Ceramic Magnets

 

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Features & Spec.
 
Application
 
Attention
 
Package
 
Name:Ceramic Magnets
Serial:Ceramic Magnets
Features:Ceramic Magnets
Detail:

General Description:
Ceramic (ferrite) magnets are composed of SrO or BaO and Fe2O3. They are charcoal gray in color and usually appear in the forms of discs, rings, blocks, cylinders, and sometimes arcs or segments for motors.

 Applications of Ceramic Magnets:
• Speaker magnets
• DC brushless motors
• Magnetic Resonance Imaging (MRI)
• Magnetos used on lawnmowers and outboard motors
• DC permanent magnet motors (used in cars)
• Separators (separate ferrous material from non-ferrous)
• Used in magnetic assemblies designed for lifting, holding, retrieving and separating
• Magnetic Door Catcher
• Instrument and Meters
• Toys
• Arts and crafts
 
Attributes of Ceramic Magnets:
• Least expensive material compared to alnico and rare earth magnets
• High intrinsic coercive force
• Available in simple shapes only due to manufacturing process
• Lower service temperature than alnico, greater than rare earth  
• Lower energy product than alnico and rare earth magnets
• Most common grades of Y25,Y30,Y30H-1,Y30H-2,Y32,Y33 ceramic are 1, 5 and 8 (1-8 possible)
 
Tolerances:
For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005inch. Other dimensions are ± 2% or ± .010inch, whichever is greater.



Magnetic Characteristic of Ferrite Magnets
Grade
Br
Hcb
Hcj
 
(BH)max  
mT
KG
KA/m
Koe
KA/m
Koe
KJ/m3
MGOe
Y8T
200-235
 
2.0-2.35
125-160
1.57-2.01
210-280
2.64-3.52
6.5-9.5
0.8-1.2
Y20
320-380
 
3.2-3.8
135-190
1.70-2.38
140-195
1.76-2.45
18.0-22.0
2.3-2.8
Y22H
310-360
 
3.1-3.6
220-250
2.77-3.14
280-320
3.52-4.02
20.0-24.0
2.5-3.2
Y23
320-370
 
3.2-3.7
170-190
2.14-2.38
190-230
2.39-2.89
20.0-25.5
2.5-3.2
Y25
360-400
 
3.6-4.0
135-170
1.70-2.14
140-200
1.76-2.51
22.5-28.0
2.8-3.5
Y26H
360-390
 
3.6-3.9
220-250
2.77-3.14
225-255
2.83-3.21
23.0-28.0
2.9-3.5
Y27H
370-400
 
3.7-4.0
205-250
2.58-3.14
210-255
2.64-3.21
25.0-29.0
3.1-3.7
Y28H
370-400
 
3.7-4.0
175-210
2.20-2.64
180-220
2.26-2.77
26.0-30.0
3.3-3.8
Y30H-1
380-400
 
3.8-4.0
230-275
2.89-3.46
235-290
2.95-3.65
27.0-32.0
3.4-4.1
Y30H-2
395-415
  
3.95-4.15
275-300
3.46-3.77
310-335
3.90-4.21
28.5-32.5
3.5-4.0
Y32
400-420
 
4.0-4.2
160-190
2.01-2.38
165-195
2.07-2.45
30.0-33.5
3.8-4.2
Y33
410-430
 
4.1-4.3
220-250
2.77-3.14
225-255
2.83-3.21
31.5-35.0
4.0-4.4


Physical Property of Ferrite Magnets
Parameter
mark
Unit
Value
Recoil permeability
μrec
Gs/Oe
1.05-1.3
Curie Temperature
Tc
450
The coefficient of demagnetization to temperature
ɑ(Br)
℃-1
-0.2%(0-100℃)
The coefficient of demagnetization coercive force to temperature
ɑ(Hc)
℃-1
0.2%-0.5%(0-100℃)
Density
d
g/cm³
4.7-5.0
Resistivity
ρ
℃-1
≥106
The coefficient of linear expansion
ɑ
℃-1
 
Hardness
HV
-
480-580

No. 249 West Xianmu Road, Huzhen Town, Jinyun County, Lishui, Zhejiang China (Mainland)
Tel:+86-578-3272111,Fax:+86-578-3263799
E-mail:sales@cnlishuai.com

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