Download - Alliance Magnets
Industries we Serve
Automotive Consumer
Electronics Appliances Medical Military /
Aerospace Office
Automation
Our Magnet Family
Permanent Magnets
Cast Sintered Bonded Other
Alnico Alnico
Ferrite
SmCo
NdFeB
Calendared Compression
Injection
Ferrite Ferrite
SmCo
NdFeB
Ferrite
SmCo
NdFeB
Magnet Steel
PtCo
Cunife
Lodex
Vicalloy
Remalloy
FeCrCo
Issues When Designing for a Magnet
Items to consider when specifying a permanent magnet in an application
The material to be used
Alnico Ferrite Samarium Cobalt Neodymium Iron Boron Cunife Iron Chrome Cobalt
Magnet CharacteristicsMaterials Typical Shapes Pro Con
Cast AlnicoAlNiCo
Rods, Bars, U shapeand other cast type
High BrHigh working TGood T coef.
Very Low HcHigh costHigh L/D
Requires Cast
Sintered AlnicoAlNiCo
Powder pressed to shapeComplex shapes
High Br, T
Requires ToolHigh costLow market
Ceramic/FerriteSrFe2O3
Blocks, Rings, Arcs, DiscsMost flux for $
High usageLow corrosion
Low BrRequires tool
Simple shapes
SamariumCobaltSmCo
Blocks, Rings, DiscsArcs, Segments
No corrosionVery low T coefStable, No tool
Very expensiveSimple shapes
High Co content
NeodymiumNdFeB
Blocks, Rings, DiscsArcs, Segments
Highest magnetic properties
No tooling
CorrodesLow working TDifficult to Mag
Bonded GradesAll materials
Difficult geometriesCan be insert molded
or over-molded
Complex shapesVarious resins
High toolingLow magneticsHigh volumes
The method of manufacture
Cast
Sintered
Bonded Calendared Injection molded Compression molded Extruded
Typical Magnet Shapes
Sintered:
RingDiscArcRodCylinderBreadloafSegment
Bonded:
It is up to yourimagination
Coating and Plating
Material 1 e-
coat 2
Epoxy 3
Nickel 4
Zinc 5 Paralene Method of coating Coating thickness Color or luster
NdFeB Coatings
Properties Organic: E-Coat Metallic: Nickel Plating
Application TypeImmersion Electrodeposition
Epoxy/UrethaneWater Based
ImmersionBarrel
ElectroplateElectroless
Pretreat ProcessAlkaline Clean
Acid Etch/Passivate
Alkaline CleanElectroclean
Acid Etch/Activate
Thickness15-25
(0.6-1.0 mil)10-50
(0.4-2.0 mil)
Uniformity(Flatness/Edges)
Excellent20% Edge Loss
Good50% Edge Gain
DurabilityGood
Pencil 2H-4HExcellent
300-1000 V100
Temp and Humidityat 85C and 85% RH
250 Hours Over 1200 Hours