金属粉末材

B
B1
MAGNETIC MATERIAL + CORES
MAGNETIC MATERIAL
B1.3 FERROCART | OVERVIEW
FERROCART (IRON POWDER)
Our FERROCART material grades are manufactured by pressing; they consist of a blend of
magnetically soft metal powder and isolating binder. Through fine grain dispersion, eddy
currents are largely suppressed. Different FERROCART types, which are suitable for application
at low frequency ranges, up to approximately 100 MHz, can be manufactured by mixture of
metal powder types and isolation portions. We can fully take advantage of the metallic
Magnetika, which is the high magnetization, with this material, for instance in component
parts used for power electronics. Furthermore fine grain dispersion implicates internal
demagnetization with the result of an extremely good stabilization. Air gaps, which have to be
mostly used in strip band cores or laminated steel cores, are no more necessary. By using
FERROCART material grades, it ensues in many cases, like loading coil - and noise suppression
choke applications, very cheap inductive component parts.
Remark
The data of our different material grades as shown on the following tables, were measured on
toroidal test cores. As is well known there is no direct relation between material
characteristics as measured on test pieces and the corresponding parameters of other cores,
made of the same material, but different in shape and size, especially if cores are applied
outside those ranges (e.g. of frequency, induction, or temperature), within which the
catalogue material properties have been ascertained.
No guarantee can be given that specifications as laid down in this catalogue may not be
changed before the next edition is given to press. Obligatory assurances of properties require
separate agreements in writing in order to become efficacious.
For these reasons, if new components are to be designed, we ask our customers for due
contact in order to agree on suitable specifications. This can be done either by fixing
measuring conditions and quantities or by exchanging standard cores or components.
General technical characteristics
Density
≈
5 . . . 7,4
g·cm-3
DC Resistivity
≈
5
Ω·m
E-Modul
≈
30 . . . 70
kN·mm-3
Expansion Coefficient
≈
10 . . . 25
10-6·K-1
Thermal Conductivity
≈
10
W·m-1·K-1
177
B
B1
MAGNETIC MATERIAL + CORES
MAGNETIC MATERIAL
B1.3 FERROCART
NEW MATERIAL
Fe 897: Iron powder with high amplitude permeability
500
Fe 897
Fe 893
450
400
350
300
µa
250
200
150
100
50
f = 1 kHz
0
100
1000
Hs / A/m
TASK:
Development of a µa optimized iron powder material for AC applications
Result:
Fe897 with a amplidude permability of 420 with low power losses
178
10000
B
B1
MAGNETIC MATERIAL + CORES
MAGNETIC MATERIAL
B1.3 FERROCART | SUMMARY
Application
High Q circuits
(Coils with high thermal and
Frequency range
Magnetic load
Powder materials
Core shape
MHz
FERROCART
≤ 10
Fe 818
Rod, tube,
≤ 100
Fe 810
screw, nipple
temporal stability insensible of
and cup cores
external magnetic fields)
All powder
materials have
a high
Anti-interference and
≤ 10
damping coils
saturation
Fe 876
magnetization
Fe 850
multi-aperture, E-,
and are there-
Fe 818
and pot cores, toroids
fore usable
Fe 810
Power applications
at extremely
Fe 897
(Inductors and transformers
high magnetic
Fe 896
with high thermal and temporal
load.
Fe 893
stability, for high AC amplitudes
or high premagnetization, e.g.
Rod, tube,
Fe 892
Fe 876
≤ 0,2
loading coils, noise
Fe 875
suppression coils)
Fe 850
Toroids
Fe 835
Fe 818
Toroids for thyristor noise
Fe 896
suppression chokes for
Fe 892
dimmers.
179
Toroids
B
B1
MAGNETIC MATERIAL + CORES
MAGNETIC MATERIAL
B1.3 FERROCART | SUMMARY
FERROCART
Initial permeability
Relative loss factor
frequency
Rel. temperature factor
25°C - 70°C
Fe 897
µi
Rel. temperature factor
140
110
100
75
± 15%
± 15%
± 15%
± 15%
1600
120
1600
0,16
0,01
0,16
0,01
0,16
100
< 18
< 18
<5
°C
200
200
200
200
180
Toroids
Toroids
Toroids
Toroids
Toroids
Fe 875
Fe 850
Fe 835
Fe 818
f
1)
75
55
35
± 15%
± 15%
± 15%
1
MHz
αF
0,01
1400
< 10
tanδ
-6
µi 10
0,16
190
< 18
µi
0,01
1200
10-6
K
Maximum operating temperature
1)
125
αF
25°C - 70°C
preferred shapes
Fe 876
MHz
FERROCART
frequency
Fe 892
f
preferred shapes
Relative loss factor
Fe 893
± 15%
1
tanδ
-6
µi 10
Maximum operating temperature ¹
Initial permeability
Fe 896
0,01
0,16
Fe 810
18
10
± 10%
± 10%
120
1300
140
800
100
180
110
200
500
2000
0,01
0,16
0,02
0,3
0,05
0,5
0,05
0,5
12
100
-6
10
K
< 18
< 15
< 12
< 12
<2
°C
180
180
150
150
120
Toroids
Toroids
Toroids
the maximum operating temperature of coated
cores depends on the temperature behaviour of
the coating material.
180
Toroid, rod, tube, screw cores