Ferrite Ring Magnets for Speaker

  • Model NO.: Ferrite Magnet
  • Magnetocrystalline Anisotropy: Isotropic Magnet
  • Shape: Ring
  • Composition: Ferrite Magnet
  • Business Type: Manufacturer/Factory
  • R&D Capacity: Owned Brand/OEM/ODM
  • Trademark: HHS MAG
  • Origin: China
  • Type: Permanent
  • Application: Speaker Magnet, Industrial Magnet
  • Coating: No
  • Category: Sintered
  • Member Type: Gold Member
  • City: Ningbo
  • Transport Package: Standard Export Carton, Pallet
  • HS Code: 8505190090
Ferrite ring speaker magnets
1.Introduction
Ferrite ring speaker magnets are made of hard ferrites, which have a high coercivity and high remanence after magnetization. These are composed of iron oxide and barium or strontium carbonate. The high coercivity means the materials are very resistant to becoming demagnetized, an essential characteristic for a permanent magnet. They also conduct magnetic flux well and have a high magnetic permeability. 
 
2.Material:
Strontium ferrite, SrFe12O19 (SrO·6Fe2O3), a common material for permanent magnet applications.
Barium ferrite, BaFe12O19 (BaO·6Fe2O3), a common material for permanent magnet applications. Barium ferrites are robust ceramics that are generally stable to moisture and corrosion-resistant. They are used in e.g. subwoofer magnets and as a medium for magnetic recording, e.g. on magnetic stripe cards.
Cobalt ferrite, CoFe2O4 (CoO·Fe2O3), used in some media for magnetic recording.
 
3.Main features:
1.high working temperature
2.good corrosion resistance
3.high intrinsic coercive force
 
4.Parameter

Max. Operating Temperature
°c
250

Hardness
Hv
480-580

Density
g/cm3
4.8-4.9

Relative Recoil Permeability
μ rec
1.05-1.20

Saturation Field Strength
kOe
10

Temperature Coefficient of Br
kA/m
800

Temperature Coefficient of iHc
%/°c
%/°c
-0.2
0.3

Tensile Strength
N/mm²
<100

Transverse Rupture
N/mm²
300

  
5.Typical Properties:

Ferrite Typical Physical Properties of Chinese Standard

Item
Grade
Remanence:Br

Coercivity:bHc
Coercivity:iHc
Max Energy Product

Br(mT)
Br(Gs)
bHc(kA/m)
bHc(Oe)
iHc(kA/m)
iHc(Oe)
(BH)max(KJ/m3)
(BH)max(MGOe)

Y10
Isotropic
200-235
2000-2350
125-160
1570-2010
210-280
2640-3520
6.5-9.5
0.8-1.2

Y25
Anistropic
360-400
3600-4000
135-170
1700-2140
140-200
1760-2510
22.5-28.0
2.8-3.5

Y30
Anistropic
370-400
3700-4000
175-210
2200-2640
180-220
2260-2770
26.0-30.0
3.3-3.8

Y30BH
Anistropic 
380-400
3800-4000
230-275
2890-3460
235-290
2950-3650
27.0-32.5
3.4-4.1

Y33
Anistropic
410-430
4100-4300
220-250
2770-3140
225-255
2830-3210
31.5-35.0
4.0-4.4

Y35
Anistropic
400-420
4000-4200
160-190
2010-2380
165-195
2070-2450
30.0-33.5
3.8-4.2

 
6.Applications:
 
barium ferrite magnets are now widely applied in speaker, louderspeaker,Ferrite magnets have largely displaced Alnico magnets in these applications.It is a common magnetic material for electromagnetic instrument pickups.
 
7.Production Flow Diagram
Control of Incoming Goods→Iron Oxide&Barium or Strontium Carbonate →Mixing →Presintering-Calcining →Milling →Add Binder →Granulating →Pressing →Sintering →Grinding →Cleaning →Final Inspection →Magnetising →Finished Production 
 
 
8.kindly reminder
Dear customer,you know all of our product are customized. So in order to save your time, our quotation is based on your material, size,coating,magnetization direction and quantity. If you could send us drawing which shows the information in need, that will be better. 
 
 
 

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