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NINGBO HONY TECHNOLOGY CO.,LTD
NINGBO HONY TECHNOLOGY CO.,LTD

China ring ferrite speaker magnet manufacturer

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ring ferrite speaker magnet 

Price: 0.5~0.7 USD 
Payment Terms: T/T,L/C 
Place of Origin: Zhejiang, China (Mainland) 
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Product Detail

Means of Transport: Ocean
Packing: CARTON OR PALLET
Application: Speaker Magnet
Type: Permanent
shape: ring shape
usage: speaker
MOQ: 1000
Production Capacity: 1000000
Delivery Date: 35DAYS
Shape: Coil
Composite: Ferrite Magnet
material: ceramic magnet
coating: NO
GRADE: For your require

Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds. They have a low coercivity and are ca

We can supply . If you are interested in our Ring antisotropic speaker Magnet,please contact us.

Soft ferrites

Ferrites that are used in transformer or electromagnetic cores contain nickel, zinc, and/or manganese compounds. They have a low coercivity and are called soft ferrites. The low coercivity means the material's magnetization can easily reverse direction without dissipating much energy (hysteresis losses), while the material's high resistivity prevents eddy currents in the core, another source of energy loss. Because of their comparatively low losses at high frequencies, they are extensively used in the cores of RF transformers and inductors in applications such as switched-mode power supplies.

The most common soft ferrites are:

  • Manganese-zinc ferrite (MnZn, with the formula MnaZn(1-a)Fe2O4). MnZn have higher permeability and saturation induction than NiZn.

  • Nickel-zinc ferrite (NiZn, with the formula NiaZn(1-a)Fe2O4). NiZn ferrites exhibit higher resistivity than MnZn, and are therefore more suitable for frequencies above 1 MHz.

Hard ferrites

In contrast, permanent ferrite 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. This enables these so-called ceramic magnets to store stronger magnetic fields than iron itself. They are cheap, and are widely used in household products such as refrigerator magnets. The maximum magnetic field B is about 0.35 tesla and the magnetic field strength H is about 30 to 160 kiloampere turns per meter (400 to 2000 oersteds).[3] The density of ferrite magnets is about 5g/cm3.

The most common hard ferrites are:

  • 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.[

  • Sintered NdFeB Magnet
    GradeResidual Induction  (Br)Coercive Force (Hcb)Intrinsic Coercive Force (Hcj)Max Energy Product (BH)maxMax Working Temp.
    TkGskA/mkOekA/mkOeKj/m³MGOe(°C)
    N351.17-1.2211.7-12.2≥868≥10.9≥955≥12263-28733-3680
    N381.22-1.2512.2-12.5≥899≥11.3≥955≥12287-31036-3980
    N401.25-1.2812.5-12.8≥907≥11.4≥955≥12302-32638-4180
    N421.28-1.3212.8-13.2≥915≥11.5≥955≥12318-34240-4380
    N451.32-1.3813.2-13.8≥923≥11.6≥955≥12342-36643-4680
    N481.38-1.4213.8-14.2≥923≥11.6≥955≥12366-39046-4980
    N501.40-1.4514.0-14.5≥796≥10≥876≥11374-40647-5160
    N521.43-1.4814.3-14.8≥796≥10≥876≥11390-42249-5360
    N35M1.17-1.2211.7-12.2≥868≥10.9≥1114≥14263-28733-36100
    N38M1.22-1.2512.2-12.5≥899≥11.3≥1114≥14287-31036-39100
    N40M1.25-1.2812.5-12.8≥923≥11.6≥1114≥14302-32638-41100
    N42M1.28-1.3212.8-13.2≥955≥12≥1114≥14318-34240-43100
    N45M1.32-1.3813.2-13.8≥955≥12.5≥1114≥14342-36643-46100
    N48M1.37-1.4313.7-14.3≥1027≥12.9≥1114≥14366-39046-49100
    N50M1.40-1.4514.0-14.5≥1033≥13≥1114≥14382-40648-51100
    N35H1.17-1.2211.7-12.2≥868≥10.9≥1353≥17263-28733-36120
    N38H1.22-1.2512.2-12.5≥899≥11.3≥1353≥ 17287-31036-39120
    N40H1.25-1.2812.5-12.8≥923≥11.6≥1353≥17302-32638-41120
    N42H1.28-1.3212.8-13.2≥955≥12≥1353≥17318-34240-43120
    N45H1.32-1.3613.2-13.6≥963≥12.1≥1353≥ 17326-35843-46120
    N48H1.37-1.4313.7-14.3≥995≥12.5≥1353≥17366-39046-49120
    N35SH1.17-1.2211.7-12.2≥876≥11≥1592≥20263-28733-36150
    N38SH1.22-1.2512.2-12.5≥907≥11.4≥1592≥20287-31036-39150
    N40SH1.25-1.2812.5-12.8≥939≥11.8≥1592≥20302-32638-41150
    N42SH1.28-1.3212.8-13.2≥987≥12.4≥1592≥20318-34240-43150
    N45SH1.32-1.3813.2-13.8≥1003≥12.6≥1592≥20342-36643-46150
    N28UH1.04-10810.4-10.8≥764≥9.6≥1990≥25207-23126-29180
    N30UH1.08-1.1310.8-11.3≥812≥10.2≥1990≥25223-24728-31180
    N33UH1.13-1.1711.3-11.7≥852≥10.7≥1990≥25247-27131-34180
    N35UH1.17-1.2211.7-12.2≥860≥10.8≥1990≥25263-28733-36180
    N38UH1.22-1.2512.2-12.5≥876≥11≥1990≥25287-31036-39180
    N40UH1.25-1.2812.5-12.8≥899≥11.3≥1990≥25302-32638-41180
    N42UH1.28-1.3212.8-13.2≥899≥11.3≥1990≥25318-34240-43180
    N28EH1.04-1.0810.4-10.8≥780≥9.8≥2388≥30207-23126-29200
    N30EH1.08-1.1310.8-11.3≥812≥10.2≥2388≥30223-24728-31200
    N33EH1.13-1.1711.3-11.7≥836≥10.5≥2388≥30247-27131-34200
    N35EH1.17-1.2211.7-12.2≥876≥11≥2388≥30263-28733-36200
    N38EH1.22-1.2512.2-12.5≥899≥11.3≥2388≥30287-31036-39200
    N40EH1.25-1.2812.5-12.8≥899≥11.3≥2388≥30302-32638-41200
    N28AH1.04-1.0810.4-10.8≥787≥9.9≥2624≥33207-23126-29230
    N30AH1.08-1.1310.8-11.3≥819≥10.3≥2624≥33223-24728-31230
    N33AH1.13-1.1711.3-11.7≥843≥10.6≥2624≥33247-27131-34230
    N35AH1.17-1.2211.7-12.2≥876≥11≥2624≥33263-28733-36230
    N38AH1.22-1.2512.2-12.5≥899≥11.3≥2624≥33287-31036-39230
  • Mateirial : NDFEB MAGNET
    Grade: N35
    SIZE: D10X3 MM
    Coating: CHROME PLATED

  • Magnetic Properties of Neodymium Magnets
    GradeResidual InductionCoercive ForceIntrinsic Coercive ForceMaximum Energy ProductMaximum Working Temperature
    BrHcbHcj(BH)maxTw
    mTkA/mkA/mkJ/m3
    [kGs][kOe][kOe][MGOe]
    N351170-1220≥868≥955263-28780°
    [11.7-12.2][≥10.9][≥12][33-36]
    N381220-1250≥899≥955287-31080°
    [12.2-12.5][≥11.3][≥12][36-39]
    N401250-1280≥907≥955302-32680°
    [12.5-12.8][≥11.4][≥12][38-41]
    N421280-1320≥915≥955318-34280°
    [12.8-13.2][≥11.5][≥12][40-43]
    N451320-1380≥923≥955342-36680°
    [13.2-13.8][≥11.6][≥12][43-46]
    N481380-1420≥923≥955366-39080°
    [13.8-14.2][≥11.6][≥12][46-49]
    N501400-1450≥796≥876382-40680°
    [14.0-14.5][≥10.0][≥11][48-51]
    N521430-1480≥796≥876398-42280°
    [14.3-14.8][≥10.0][≥11][50-53]
    30M1080-1130≥805≥1114223-247100°
    [10.8-11.3][≥10.1][≥14][28-31]
    33M1130-1170≥836≥1114247-263100°
    [11.3-11.7][≥10.5][≥14][31-33]
    35M1170-1220≥868≥1114263-287100°
    [11.7-12.2][≥10.9][≥14][33-36]
    38M1220-1250≥899≥1114287-310100°
    [12.2-12.5][≥11.3][≥14][36-39]
    40M1250-1280≥923≥1114302-326100°
    [12.5-12.8][≥11.6][≥14][38-41]
    42M1280-1320≥955≥1114318-342100°
    [12.8-13.2][≥12.0][≥14][40-43]
    45M1320-1380≥995≥1114342-366100°
    [13.2-13.8][≥12.5][≥14][43-46]
    48M1370-1430≥1027≥1114366-390100°
    [13.7-14.3][≥12.9][≥14][46-49]
    50M1400-1450≥1033≥1114382-406100°
    [14.0-14.5][≥13.0][≥14][48-51]
    35H1170-1220≥868≥1353263-287120°
    [11.7-12.2][≥10.9][≥17][33-36]
    38H1220-1250≥899≥1353287-310120°
    [12.2-12.5][≥11.3][≥17][36-39]
    40H1250-1280≥923≥1353302-326120°
    [12.5-12.8][≥11.6][≥17][38-41]
    42H1280-1320≥955≥1353318-342120°
    [12.8-13.2][≥12.0][≥17][40-43]
    45H1320-1360≥963≥1353342-366120°
    [13.2-13.6][≥12.1][≥17][43-46]
    48H1370-1430≥995≥1353366-390120°
    [13.7-14.3][≥12.5][≥17][46-49]
    35SH1170-1220≥876≥1592263-287150°
    [11.7-12.2][≥11.0][≥20][33-36]
    38SH1220-1250≥907≥1592287-310150°
    [12.2-12.5][≥11.4][≥20][36-39]
    40SH1250-1280≥939≥1592302-326150°
    [12.5-12.8][≥11.8][≥20][38-41]
    42SH1280-1320≥987≥1592318-342150°
    [12.8-13.2][≥12.4][≥20][40-43]
    45SH1320-1380≥1003≥1592342-366150°
    [13.2-13.8][≥12.6][≥20][43-46]
    28UH1040-1080≥764≥1990207-231180°
    [10.4-10.8][≥9.6][≥25][26-29]
    30UH1080-1130≥812≥1990223-247180°
    [10.8-11.3][≥10.2][≥25][28-31]
    33UH1130-1170≥852≥1990247-271180°
    [11.3-11.7][≥10.7][≥25][31-34]
    35UH1170-1220≥860≥1990263-287180°
    [11.7-12.2][≥10.8][≥25][33-36]
    38UH1220-1250≥876≥1990287-310180°
    [12.2-12.5][≥11.0][≥25][36-39]
    40UH1250-1280≥899≥1990302-326180°
    [12.5-12.8][≥11.3][≥25][38-41]
    28EH1040-1080≥780≥2388207-231200°
    [10.4-10.8][≥9.8][≥30][26-29]
    30EH1080-1130≥812≥2388223-247200°
    [10.8-11.3][≥10.2][≥30][28-31]
    33EH1130-1170≥876≥2388247-271200°
    [11.3-11.7][≥10.5][≥30][31-34]
    35EH1170-1220≥876≥2388263-287200°
    [11.7-12.2][≥11.0][≥30][33-36]
    38EH1220-1250≥899≥2388287-310200°
    [12.2-12.5][≥11.3][≥30][36-39]
    28AH1040-1080≥787≥2624207-231220°
    [10.4-10.8][≥9.9][≥33][26-29]
    30AH1080-1130≥819≥2624223-247220°
    [10.8-11.3][≥10.3][≥33][28-31]
    33AH1130-1170≥843≥2624247-271220°
    [11.3-11.7][≥10.6][≥33][31-34]

  • The Physical Properties of Neodymium Magnets

  • ParametersUnitsIndicators
    Densityg/cm³≥7.3
    Home temperature310-340
    BrReversible temperature coefficient℃/%-0.100~-0.130
    HcjReversible temperature coefficient℃/%0.40~0.70
    Compressive strengthN/mm21050
    Bending strengthN/mm2250
    Tensile strengthN/mm280
    Webster Hardness
    600
    Coefficient of thermal expansion(20 to 200℃)10-6/k∥5⊥-1.5
    Specific heatJ/(Kg.K)460
    Thermal conductivityW/(m.K)9
    ResistivityμΩ.cm150

  • The Surface Coatings of Neodymium Magnets

  • Surface CoatingCoating MethodCoating thickness(m)Coating ColorCoating features
    Nickelplating≥5YellowCorrosion resistance strong,with outstanding resistance to high temperature and humidity capabilities
    zincplating≥5Silvery whiteHas strong corrosion resistance,anti-salt spray test ability .
    goldplating≥5goldHas outstanding resistance to high temperature capability,corrosion resistance,good resistance to color change ablity
    Ni-Cu-Niplating15-30sliverstrong corrosion resistance
    EpoxyElectrophoresis15-20Black/grey

    strong corrosion resistance,outstanding resistance to salt spray,strong resistance to high temperature, high humidity capacity

Mr. Gene Mao
skype Mr. Gene Mao
manager
Tel: 86-574-87733820
Fax: 86-574-87733888
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NINGBO HONY TECHNOLOGY CO.,LTD [China (Mainland)]

Offline Showroom in USA

Business Type:Manufacturer, Trading Company
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)

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