Ring NdFeB, generally used into loudspeaker

NdFeB ring magnet is also widely used in the market with many different appications. Our production steps:batching - melting - powder processing - pressing - sintering - surface grinding - machining (hole processing, cutting...) - chamfering - electroplating - magnetizing - packaging. Our delivery time: sample production cycle 10-15 days, mass production cycle 20-25 days. Advantages: The most cost-effective, fast delivery, convenient assembling.

Products Details

Surface Coating Thickness μm Color SST Hours PCT Hours
Nickel Ni 10~20  Bright Silver >24~72 >24~72
Black Nickel Ni+Cu+Ni  10~20 Bright Black   >48~96 >48
Cr3+Zinc Zn C-Zn 5~8 Brighe Blue Shining Color >16~48 >36~72 ---
Sn Ni+Cu+Ni+Sn 10~25 Silver >36~72 >48
Au Ni+Cu+Ni+Au 10~15 Gold >12 >48
Ag Ni+Cu+Ni+Ag 10~ 15 Silver >12 >48
Epoxy Epoxy 10~20 Black/Grey >48 ---
Ni+Cu+Epoxy 15~30  >72~108 ---
Zn+Epoxy 15~25  >72~108 ---
Passivation --- 1~3 Dark Grey Temporary Protection ---
Phosphate --- 1~3 Dark Grey Temporary Protection) ---
Item Parameters Reference Value Unit
Auxiliary Magnetic Properties Reversible Temperature Coefficient Of Br -0.08--0.12 %/℃
Reversible Temperature Coefficient Of Hcj -0.42~-0.70      %/℃
Specific Heat 0.502    KJ·(Kg ·℃)-1
Curie Temperature  310~380      
Mechanical Physical Properties Density 7.5~7.80   g/cm3
Vickers Hardness 650      Hv
Electrical Resistance 1.4x10-6        μQ ·m
Compressive Strength 1050   MPa
Tensile Strength 80     Mpa
Bending Strength 290      Mpa
Thermal Conductivity 6~8.95 W/m ·K
Young's Modulus 160  GPa
Thermal Expansion(C⊥) -1.5     10-6/℃-1
Thermal Expansion(CII) 6.5 10-6/℃-1
Application: NdFeB ring are widely used in hollow cup motor, vacuum cleaner motor, hair dryer motor, loudspeaker and other fields. In motor applications,it has very high requirement on magnet geometric dimension and magnet property, the minimum tolerance can be within 0-0.03mm.In loudspeaker application, the magnet are normally with Zn coating, delivery under un-magnetized condition, magnet grade like N, M and H series grade, normally loudspeaker magnet don't need higher grade.Another application is for cosmetic market,we are providing millions pieces ring magnet to our clients all over the world, the magnets are used for packaging box,axial magnetized or multipole axial magnetized like 2 or 4 poles, and not only for pure magnet, we are also avaialbe for some magnet assembly. Products customized: Our ring magnet can be customized from 3mm-200mm outer diameter, 1mm-150mm inner diameter, thickness from 1mm-70mm.It also need coating most of the time, like NiCuNi, Zn, Epoxy and so on...

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