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AlNiCo - Magnets

This material was developed in the early 30's of the twentieth century. The most outstanding characteristics of this material are its high application temperature of approx. 500°C and the very low temperature coefficient of 0,02%/°K. Because of their high hardness AlNiCo magnets can be worked on later only by grinding and by eroding.
If you are using the magnet as a single magnet without iron support its length-diameter ratio should be 3 - 7. Because of the advantages mentioned this material is used preferentially in adhesive systems for high application temperatures, signal generators for Hall/Reed Sensors and in measuring instruments.

rings

from ø 15 mm to ø 135

cylinders

from ø 1,7 mm to ø 53 mm

blocks

from 1,5 mm to 240 mm

special designs

according to your requirements

Simply ask for your desired magnet. More than 100 different types and dimensions of AlNiCo magnets are available from stock. We are able to manufacture any additional dimension you might require.

Physical and chemical characteristics

Chemical composition [Gew.-%] : 8AL; 14Ni; 24Co; 3,5Cu; RestFe
Density : 7,3 g/cm³
Curie-temperature : 860 °C
max. usage temperature : 450 °C
Expansion coefficient : 11,3 x 10-6/°C
specific electric resistance: 0,5 μ Ohm m
Vickers hardness : HV 10 ca. 500 - 600
Compressive strength : 1200 - 2200 N/mm²

In its chemical resistance the material is similar to highly alloyed steel, but inconsistant in inorganic acids, in sea water or in strongly alkaline solutions. The material is not attacked by organic solvents, alcohols, oils and gasoline. The material is nontoxic and does not pollute the environment. People who are sensitive to nickel can react with the same side effects as other Ni-containing materialsA direct contact with food and the use in the toy industry should be avoidedIf necessary the magnets can be coated with plastic or food-suited colorThe magnets are very hard and brittle, the edges break easily and they can only be worked on by abrasive procedures (grinding).

Technical Details

Material
Remanence  Br [mT]
HCB kA/m
HCj [kA/m]
Bhmax [KJ/m3]
working -
temp. [°C]
Curie-
temp. °C
Density
 
 
min
max
min
max
min
max
min
max
max
max
g/cm3
Alnico 120Alnico 145049556615763885007607,3
Alnico 160Alnico 26006604044414510115007607,3
  7207925257535915175008107,3
Alnico 500
(Guss)
Alnico 5C12001320444845503336520 7,3
Alnico 600Alnico 5DG120013204853495436405508907,3
Alnico 500
(Sinter)
Alnico 5110012105359556034375508907,3
Alnico 700Alnico 5-7122013424853495438425508907,3
Alnico 400Alnico 6125013755661576347525508907,3
Alnico 450
(Guss)
Alnico 89009905763596528315208907,3
Alnico 450
(Sinter)
Alnico 880088011012111112237415208507,3
  88096811012111112247525208507,3
 Alnico 99009901101211111225661520  
  70077013514913715034375208507,3

Other types of magnets

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