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Amorphous, and Nanocrystalline Cores
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Ferrite, Amorphous, and Nanocrystalline Cores
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Amorphous Alloy
Amorphous alloys feature an ultra-fine grain structure. With high magnetic permeability, high-saturation magnetic induction, low core loss and excellent stability, they meet the development needs of today’s electronic products toward high frequency, high current, miniaturization and energy-saving. Theycan replace silicon steel, permalloy, and ferrite, and are widely used in electric power and electronic products.
As a new type of soft magnetic alloy material, amorphous alloys areproduced using internationally advanced super-rapid quenching technology. Molten metal is cooled directly at a rate of millions of degrees Celsiusper second to form amorphous thin strips with a thickness of 14 ~ 20µm. This results in an amorphous alloy structure with short-range order, and long-range disorder in atomic arrangement, which is fundamentallydifferent from the microstructureof conventional metals and alloys.
Therefore, amorphous alloys exhibit incomparable superiorcharacteristics over conventional metallic materials in many aspects, such as physical, chemical, and mechanical performance. In addition, their preparationprocess is entirely different from traditional metallurgic techniques. Amorphous alloys are produced directly from molten steel into thin amorphous ribbons in a single step, eliminating multiple processes such as casting, forging, intermediate annealing, and rolling used in conventionalmetallurgy. This significantly saves energy, and produces no pollutant emissions.
Amorphous alloys are thus known as new type of green material that is environmentally friendly, energy-saving, and highly efficient.
Nanocrystalline Alloy
The amorphous strip is annealed at 400-600 ℃ to precipitate small grains of 10-20nm, forming a composite structure of amorphous and nanocrystals, retaining the low defect characteristics of amorphous materials while introducing the high magnetic permeability advantage of nanocrystals.
Property Comparison between Amorphous Alloy and Nanocrystalline Alloy
|
Property |
Amorphous Alloy |
Nanocrystalline Alloy |
|
Structure |
Long-range disorder |
Nano-grains in amorphous matrix |
|
Saturation Magnetic Flux Density (Bs) |
1.25 –1.6T |
1.2 –1.4T |
|
Coercivity (Hc) |
1 –10 A/m |
<1 A/m |
|
Initial Permeability (µi) |
103- 104 |
104–105 much higher |
|
Core Loss |
Low at <20kHz |
Ultra-low at >50kHz |
|
Temperature Stability-Curie |
~ 370oC |
~ 570oC |
|
Toughness |
Hard & brittle |
Much better |
|
Cost |
Lower |
Higher |
|
Applied Best for |
Low-frequency, High flux density, Cost-sensitive |
High-frequency, High-precision, High Temperature |
Soft Magnetic Materials Matrix of Amorphous, Nanocrystalline alloys
Iron-based Amorphous Ribbon
Product IntroductionIt is composed of iron, silicon, and boron, with high permeability, high saturation magnetic flux density, low loss and good temperature stability. |
Main Parameters
|
Main Applications
|
Iron-based Nanocrystalline Ribbon
Product IntroductionIt is composed of iron, silicon, boron and a small amount of copper, molybdenum, niobium, etc., with high permeability & saturation magnetic flux density, low Hc, low loss & excellent temperature stability, mainly used for replacing silicon steel sheet, ferrite & permoalloy. |
Main Parameters
|
Main Applications
|
Cobalt-based Amorphous Ribbon
Product IntroductionIt is composed of iron, cobalt, silicon and boron, with high permeability, ultra-low loss and good temperature stability. |
Main Parameters
|
Main Applications
|
Specifications and Properties of Iron-based Nanocrystalline Strips
Pressure Original Belt Specifications
|
Width Spec. |
Width (mm) |
|
33 |
33+5 |
|
39 |
39+5 |
|
43 |
43+5 |
|
48 |
48+5 |
|
Thickness Spec |
Thickness (mm) |
|
23µm Series |
23+1 |
|
21µm Series |
21+1 |
|
19µm Series |
19+1 |
|
17µm Series |
17+1 |
|
15µm Series |
15+1 |
Gravity Direct Injection Belt Specifications
|
Width Specification (mm) |
Width Tolerance (mm) |
Thickness Specification (mm) |
Thickness Deviation (mm) |
|
2 - 30 |
+0.1 |
22 –40 |
+3 |
Physical Property Parameters
|
Saturation Flux Density Bs |
1.25T |
Magnetostriction Coefficient |
<2.0*10-6 |
|
Curie Temperature Tc |
570℃ |
Density |
7.2g/cm3 |
|
Crystalline Temperature Tc |
510℃ |
Resistivity |
130µΩ·m |
|
Vickers Hardness (Hv) |
880kg/ mm2 |
Operating Temperature |
-55℃~ 155℃ |
Magnetic Characteristics Parameters
|
Item |
After annealing with no magnetic field |
After annealing with transverse magnetic field |
After annealing with longitudinal magnetic field |
|
Initial permeability µi |
>8*104 |
>2*104 |
>1*104 |
|
Max Permeability µmax |
40*104 |
/ |
/ |
|
Coercivity Hc |
<0.8A/m |
<1A/m |
<2A/m |
|
Remanence Br |
<0.6T |
<0.2T |
>0.8T |
|
Loss @20KHz/0.5T |
≤20w/kg |
≤25w/kg |
≤25w/kg |
|
Loss @100KHz/0.2T |
≤50w/kg |
≤70w/kg |
≤70w/kg |
|
-55℃-125℃Change rate |
≤15% |
≤15% |
≤15% |
Magnetic Property Comparisons with Other Magnetic Materials
|
Mat’l name Magnetic Properties |
Si Steel Sheet |
Ferrite |
Permoalloy |
Amorphous Alloy |
Nanocrystalline Alloy |
||
|
Mn-Zn |
50Ni |
80Ni |
Co-based Amorphous |
Iron-based Amorphous |
Iron-based Nanocrystalline |
||
|
Saturation Flux Density Bs (T) |
2.03 |
0.5 |
1.55 |
0.74 |
0.55 |
1.56 |
1.25 |
|
Coercivity Hc (A/m) |
40 |
8 |
12 |
2.4 |
<1 |
<4 |
<2 |
|
Initial Permeability µi *104 |
0.15 |
0.3 |
0.6 |
4 |
10 |
0.5 |
8 |
|
Max Permeability µm *104 |
2 |
0.6 |
6 |
20 |
80 |
5 |
40 |
|
Resistivity ρµΩ·cm |
50 |
5*107 |
30 |
60 |
120 |
130 |
130 |
|
Curie Temperature Tc (℃) |
750 |
220 |
500 |
450 |
400 |
410 |
570 |
Magnetic Hysteresis Loop
|
Magnetization Curve
|
Permeability-Frequency Curve
|
Loss Curve
|
EMC Nanocyrstalline Common Mode Inductor Cores
Characteristics
|
Applications
|
|
|
|
Property Metrics
|
Material Name |
Iron-based Nan℃rystalline |
|||
|
Grade |
1K107F |
1K107G |
1K107H |
1K107J |
|
Saturation Flux Density Bs (T) |
1.2 |
1.2 |
1.2 |
1.2 |
|
Coercivity Hc (A/m) |
≤1 |
≤1 |
≤2 |
≤1 |
|
Saturation Magnetic Field Strength (TYP) Hs (A/m) |
15 |
60 |
300 |
20 |
|
Relative Permeability (TYP) µr*104@10kHz |
8 |
2.5 |
0.5 |
7 |
|
Relative Permeability (TYP) µr*104@100kHz |
3.5 |
2 |
0.5 |
3.5 |
|
Resistivity ρµΩ·cm |
90 |
90 |
90 |
90 |
|
Curie Temperature Tc (℃) |
570 |
570 |
570 |
570 |
Property Curves
Magnetic Hysteresis Loops of Different Permeability
|
Permeability VS DC-bias Curve
|
Permeability VS Frequency Curve
|
Permeability VS Temperature Change Curve
|
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