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Amorphous Alloys VITROVAC

 

Amorphous - what is this ?

The main charactistic of amorphous alloys is the absence of periodic crystalline arrangements of atoms, their structure is unordered resembling the distribution of atoms in a melt. As a result, amorphous metals are soft magnetic while at the same time mechanically hard. This is a direct contradiction of the old school of thought on crystalline metals.

 

 

Cost-effectivity:
  • Production of ribbons in one step directly from melt
    (rapid solidification)

Special properties:
  • magnetically soft
  • high permeability
  • magnetostriction adjustable to zero
  • low losses

a n d

  • mechanically hard

Typical Properties
  • As a rule, the magnetic properties of amorphous alloys are adjusted by the heat treatment only. By carrying out the heat treatment in a magnetic field, the relaxation and stabilization processes occuring during heat treatment can also be used for adjusting defined shapes of hysteresis loops. After heat treatment amorphous materials are brittle, therefore only the the end product can be heat-treated, as a rule this is a toroidal strip wound core. Amorphous strips without heat treatment can be used only in those applications where the distinct stray of magnetic properties can be tolerated (e.g. shieldings or magnetic heads.

Forms of supply:
  • Semi-finished material exclusively in form of thin metal foils
    (strip thickness approx. 20-25 µm and a maximum strip width of (presently) 56 mm (as cast)
  • or preferably: Toroidal strip-wound cores and
    Inductive Components

Typical properties

Alloy

6025

6070

6030

6150

Main transition metal besides metalloids

Co

Co

Co

Co

Saturation flux density

Bs[T]

0,55

0,62

0,82

1,0

Curie temperature

[°C]

210

240

365

485

Saturation magnetostriction 10e-6

<0,2

<0,2

<0,2

<0,2

Measured values on strip-wound

cores with Z-loop

6025Z

DC coercivity

[mA/cm]

3

Remanence ratio

0,9

Core losses (100kHz, 0,3T)

[W/kg]

120

Measured values on strip-wound

cores with F-loop

6025F

6070F

6030F

6150F

Effective unipolar flux density swing

[T]

0,4

0,5

0,7

0,9

Max. pulse permeability

70.000 -
100.000

25.000 - 50.000

2.500 - 3.500

1.100 - 1.600

Core losses (100kHz, 0,3T)

[W/kg]

100

100

110

130

The mentioned data are nominal values only



 

Further alloy variants for special applications available on request.

 

For Electronic Article Surveillance (EAS) applications VAC offers direct cast ribbons
in widths of 0,7-1,5 mm which - due to the production process - have a remanence ratio
of >0,7 mm:

VC6025Z

VC6006Z

Saturation flux density

[T]

0,55

0,4

Remanence ratio

>0,7

>0,7

typical width

[mm]

0,75

0,75