Metallic Powder cores

Material Properties

Characteristics of iron powder core:

So as to obtain a new metallic powder core with constant permeability and low core loss up to higher frequency range, we have tried to prepare the amorphous alloy powder cores by using the Fe[70]Al[5]Ga[2]P[9.65]C[5.75]B[4.6]Si[3] glassy alloy powders that have a wide supercooled liquid region (ΔTx) below crystallization temperature (Tx). The iron powder core had a constant permeability of about 110 up to 10 MHz, and a lowest core loss of 610 kW/m3 at Bm = 0.1 T and f = 100 kHz in any other metallic powder cores. These excellent magnetic properties of the iron powder core in a higher frequency range are presumably due to an extremely low coercive force (He) derived from sufficient elimination of internal stress by annealing at near the ΔTx and its higher electrical resistivity (p) of about 1.60 µΩm for the Fe[70]Al[5]Ga[2]P[9.65]C[5.75]B[4.6]Si[3] glassy alloy. For the excellent magnetic properties of the iron powder core, therefore, allows us to expect that this toroidal core will be suitable for high frequency drive magnetic devices such as a choke coil, reactor and so on.

1.MATERIAL PROPERTIES OF THE IRON POWDER CORE

Characteristics \ Material 35 55 75 22 33 60 75a
Permeability µ 35 55 75 22 33 60 75
Temp.Coef.of
Perm(+ppm/oC)
250 360 825 410 600 950 650
Color Code Yellow/red Green/red Yellow/white Gray/green Gray/yellow Green/yellow Green/blue

2.SIZE TOLERANCE(mm) OF THE IRON POWDER CORE

Yuxiang Part Number OD(mm) ID(mm) Ht(mm)
YT30-YT38 ±0.35 ±0.35 ±0.35
YT44-YT72 ±0.50 ±0.50 ±0.50
YT80-YT141 ±0.50 ±0.50 ±0.60
YT150-YT225 ±0.60 ±0.60 ±0.75
YT249-YT300 ±0.75 ±0.75 ±0.75
The listed tolerance includes coating

3.MATERIAL PROPERTIES OF OTHER METALLIC POWDER CORE

Type Material µ Q Temp.Coeff. (-65~125) oC (ppm) Density (g/cm3) Grey Color Bs (Gs) Inductance coeff. Tolerance Al
T3H FeNi50 60 ≥20 ≤300 7.6 Blue 13000 ±15%
T4H FeNi50 125 ≥5 ≤300 7.6 Blue 13000 ±15%
SHAPEiron powder core metallic powder core toroidal core e cores bus bar cores u cores i cores
SYMBOL AND FORMULAiron powder core metallic powder core toroidal core e cores bus bar cores u cores i cores
Ae-Core Cross sectional area(cm2)
Le - Effective magnetic path length(cm)
N - Winding turns
AL -Inductance rated value (nH/N2)of one core,during frequency
      10KHz and AC flus density 10 gauss(lmT)
L - Inductance
µe - Effective Permeability
π - 3.14