MIM-Fe02Ni Soft Magnetic Alloy
MIM-Fe02Ni is an iron-nickel soft magnetic alloy optimized for cost-sensitive applications requiring high saturation flux density and moderate permeability. With only 2% nickel content, this alloy offers the lowest material cost among soft magnetic MIM grades while delivering magnetic performance suitable for high-flux applications such as motor cores, magnetic yokes, and industrial actuators.
At Emitech, we produce MIM-Fe02Ni components with near-full density and consistent magnetic properties. The low nickel content makes this alloy particularly attractive for high-volume consumer electronics, automotive sensors, and industrial motor applications where material cost significantly impacts total product economics.
Material Characteristics
MIM-Fe02Ni prioritizes flux-carrying capacity and cost efficiency over extreme permeability:
- Highest saturation flux density — Bs exceeds 1.7 T, maximizing magnetic energy in compact volumes
- Moderate permeability — Initial relative permeability of 400-600, sufficient for power and general magnetic circuits
- Lowest cost — Approximately 40-50% lower raw material cost than Fe08Ni
- High Curie temperature — Tc ≈ 720°C, suitable for elevated temperature operation
- Good mechanical strength — Higher yield strength than high-nickel soft magnetic alloys
- Ferromagnetic stability — Consistent properties from -40°C to 200°C
Chemical Composition
| Element | Weight % (typical) |
|---|---|
| Iron (Fe) | Balance |
| Nickel (Ni) | 1.5 - 2.5 |
| Molybdenum (Mo) | ≤ 0.5 |
| Carbon (C) | ≤ 0.02 |
| Manganese (Mn) | ≤ 0.5 |
| Silicon (Si) | ≤ 0.5 |
| Phosphorus (P) | ≤ 0.02 |
| Sulfur (S) | ≤ 0.02 |
Magnetic Properties
| Property | Value (Typical) |
|---|---|
| Initial Permeability (μi) | 400 - 600 |
| Maximum Permeability (μmax) | 2,000 - 3,500 |
| Coercivity (Hc) | 150 - 250 A/m |
| Saturation Flux Density (Bs) | ≥ 1.7 T |
| Remanence (Br) | ≤ 1.2 T |
| Curie Temperature (Tc) | ≈ 720°C |
| Electrical Resistivity | ≈ 25 μΩ·cm |
| Density (sintered) | ≥ 7.75 g/cm³ |
MIM Soft Magnetic Alloy Comparison
| Property | MIM-Fe02Ni | MIM-Fe04Ni | MIM-Fe08Ni |
|---|---|---|---|
| Nickel Content | 1.5 - 2.5% | 3.5 - 4.5% | 7.5 - 8.5% |
| Initial Permeability (μi) | 400 - 600 | 800 - 1,200 | ≥ 2,000 |
| Coercivity (Hc) | 150 - 250 A/m | 100 - 150 A/m | ≤ 80 A/m |
| Saturation Flux Density | ≥ 1.7 T | ≥ 1.6 T | ≥ 1.55 T |
| Relative Cost | Lowest | Moderate | Highest |
| Best For | High-flux, cost-sensitive | Balanced performance | High-permeability sensors |
Typical Applications
MIM-Fe02Ni is selected when maximum flux density and cost efficiency outweigh the need for ultra-high permeability:
- AC motor cores — Stator and rotor laminations for fractional horsepower motors
- Magnetic yokes — Flux return paths in loudspeakers, actuators, and magnetic clamps
- Power inductors — Toroidal and bobbin cores for DC-DC converters and filters
- Relays and contactors — Magnetic circuits for industrial switching equipment
- Automotive actuators — HVAC blend door motors, throttle body motors, and EGR valves
- Transformer cores — Small power transformers and current transformers
Why Choose Emitech for MIM-Fe02Ni Parts?
- Cost-optimized production — High-volume processing with minimized material waste
- Magnetic testing — B-H curve measurement and permeability verification
- Stacked assemblies — Insulated laminations for AC motor and transformer applications
- Consistent properties — SPC-controlled sintering for lot-to-lot repeatability
- Volume scalability — Multi-cavity tooling for million-piece annual programs
- Custom alloys — Nickel content adjustments from 1% to 3% for specific requirements
Frequently Asked Questions
Q: When should I choose Fe02Ni over Fe04Ni or Fe08Ni?
A: Choose MIM-Fe02Ni when your magnetic circuit operates at moderate to high field strengths (500-5000 A/m) where saturation flux density matters more than initial permeability. Applications like motor cores, power inductors, and magnetic yokes benefit from Fe02Ni's high Bs and lower cost. For low-field sensor applications, upgrade to Fe04Ni or Fe08Ni.
Q: Can Fe02Ni be used for high-frequency applications?
A: MIM-Fe02Ni is suitable for DC and low-frequency AC applications up to approximately 1 kHz in solid cores. Its relatively low electrical resistivity (25 μΩ·cm) results in significant eddy current losses above 1 kHz. For higher frequencies, insulated laminations or powder cores with organic binders are required.
Q: How does the cost of MIM-Fe02Ni compare to silicon steel laminations?
A: On a per-kilogram basis, MIM-Fe02Ni is more expensive than silicon steel. However, MIM eliminates stamping tooling and assembly labor for complex 3D shapes. For small motors and magnetic components with features like holes, slots, and mounting bosses, MIM-Fe02Ni often provides lower total cost at volumes above 50,000 pieces annually.
Q: What insulation is used for Fe02Ni laminated stacks?
A: We apply inorganic phosphate coatings (0.5-2 μm) or organic resin coatings to individual laminations before stacking. Phosphate coatings withstand temperatures up to 500°C and provide interlaminar resistance exceeding 100 MΩ. Organic coatings offer higher resistance (1 GΩ+) but are limited to 200°C.
Q: Can Fe02Ni parts be welded or soldered?
A: Yes, MIM-Fe02Ni can be resistance welded and brazed using standard ferrous metal procedures. Silver soldering and soft soldering are also possible. Welding may alter magnetic properties in the heat-affected zone; we recommend magnetic testing of welded assemblies for critical applications.
Q: What is the typical MOQ for MIM-Fe02Ni production?
A: Standard MOQ is 10,000 pieces annually due to tooling investment. For large-volume programs (500K+ annually), we offer dedicated tooling with 16 cavities and automated processing. Prototype quantities of 100-500 pieces are available with aluminum soft tooling at reduced cost.
Q: How does temperature affect Fe02Ni magnetic properties?
A: Permeability remains stable from -40°C to 150°C, decreasing by approximately 10% at 200°C. Saturation flux density decreases linearly with temperature, dropping to approximately 1.5 T at 200°C. The Curie temperature of 720°C provides ample margin for all practical operating temperatures.
Q: Can Fe02Ni be used in corrosive environments?
A: MIM-Fe02Ni has limited corrosion resistance due to its high iron content. For humid or mildly corrosive environments, electroless nickel plating (5-10 μm) provides adequate protection. For severe corrosion environments, consider ferritic stainless steels or encapsulated designs.
Request a Quote for MIM-Fe02Ni Parts
Looking for a cost-effective soft magnetic solution for your motor or inductor application? Our engineers will analyze your flux requirements and recommend the optimal alloy and geometry. Send us your specifications for a detailed quotation.
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