Mu-Metal,Hy-Mu 80,,E FORU

### **Mu-Metal / Hy-Mu 80** **High Permeability Nickel-Iron Soft Magnetic Alloy for Magnetic Shielding** --- #### **1. Overview** **Hy-Mu 80**, commonly referred to generically as **Mu-Metal**, is a high-permeability nickel-iron soft magnetic alloy specifically engineered for exceptional magnetic shielding performance. This alloy exhibits extremely high magnetic permeability at low field strengths, making it highly effective for shielding sensitive electronic components from external magnetic fields. Mu-Metal achieves its optimal magnetic properties through a specialized heat treatment process that includes rapid cooling from high temperatures in a protective atmosphere. --- #### **2. Chemical Composition (Weight %)** The typical chemical composition of Hy-Mu 80 is outlined below. The balance is Iron (Fe). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | 77.0 - 81.0 | Primary element responsible for high permeability and low coercivity. | | **Iron (Fe)** | Balance | Forms the base matrix of the alloy system. | | **Molybdenum (Mo)** | 4.0 - 5.0 | Enhances resistivity and improves magnetic properties. | | **Copper (Cu)** | 0.30 - 0.70 | Increases electrical resistivity and aids in property optimization. | | **Chromium (Cr)** | 0.30 - 0.70 | Contributes to improved corrosion resistance. | | **Manganese (Mn)** | 0.30 - 0.70 | Acts as a deoxidizer and improves workability. | | **Silicon (Si)** | 0.10 - 0.30 | Enhances magnetic properties and processing characteristics. | | **Carbon (C)** | 0.03 max | Minimized to prevent degradation of magnetic properties. | | **Sulfur (S)** | 0.015 max | Controlled to prevent hot shortness. | | **Phosphorus (P)** | 0.015 max | Controlled to maintain ductility. | --- #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.70 g/cm³ (0.314 lb/in³) | | **Melting Point** | ~ 1450 °C (2642 °F) | | **Curie Temperature** | ~ 400 °C (752 °F) | | **Electrical Resistivity** | 0.58 μΩ·m at 20°C (68°F) | | **Thermal Conductivity** | 19.0 W/m·K (132 Btu·in/hr·ft²·°F) at 20°C (68°F) | | **Specific Heat Capacity** | 480 J/kg·K (0.115 Btu/lb·°F) at 20°C (68°F) | | **Mean Coefficient of Thermal Expansion** | 20 - 400°C (68 - 752°F): **13.0 x 10⁻⁶/°C** (7.2 x 10⁻⁶/°F) | | **Modulus of Elasticity (Young's Modulus)** | 160 GPa (23.2 x 10⁶ psi) at 20°C (68°F) | --- #### **4. Magnetic Properties (After Proper Heat Treatment)** | Property | Value | | :--- | :--- | | **Initial Permeability (μi)** | 30,000 - 50,000 | | **Maximum Permeability (μmax)** | 80,000 - 150,000 | | **Saturation Induction (Bs)** | 0.70 - 0.80 T (7,000 - 8,000 G) | | **Coercive Force (Hc)** | 0.5 - 1.5 A/m (0.006 - 0.02 Oe) | | **Residual Induction (Br)** | 0.20 - 0.40 T (2,000 - 4,000 G) | --- #### **5. Mechanical Properties (Annealed Condition)** | Property | Value at Room Temperature | | :--- | :--- | | **Tensile Strength** | 520 MPa (75 ksi) | | **Yield Strength (0.2% Offset)** | 350 MPa (51 ksi) | | **Elongation (in 50 mm / 2 in)** | 35% | | **Hardness (Rockwell B)** | 75 HRB | --- #### **6. International Standards** Mu-Metal/Hy-Mu 80 conforms to the following international specifications: * **ASTM:** * **A753:** Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys * **MIL:** * **MIL-N-14411C:** Composition 1 * **IEC:** * **IEC 60404-8-6:** Soft magnetic metallic materials * **National Standards:** * Various national specifications for high-permeability alloys --- #### **7. Product Applications** Mu-Metal is essential in applications requiring extreme magnetic shielding: * **Electron Microscopy:** * Electron beam column shielding * Sample chamber magnetic isolation * Detector shielding * **Medical Imaging:** * MRI room shielding * PET scanner components * Medical sensor shielding * **Aerospace & Defense:** * Satellite sensor protection * Avionics magnetic shielding * Navigation system components * **Research Instruments:** * Mass spectrometer shielding * Particle detector components * Cryogenic magnetic shielding * **Consumer Electronics:** * CRT display shielding * Hard disk drive components * Precision sensor housings --- #### **8. Key Characteristics & Advantages** * **Extremely High Permeability:** Maximum permeability up to 150,000 provides superior magnetic shielding * **Low Coercive Force:** Excellent soft magnetic properties with minimal hysteresis loss * **Effective Magnetic Shielding:** Attenuates low-frequency magnetic fields by factors of 100-1000x * **Good Saturation Induction:** Maintains performance under moderate magnetic fields * **Excellent Workability:** Can be formed and fabricated into complex shielding geometries * **Predictable Performance:** Well-characterized magnetic properties for reliable design * **Proven Reliability:** Decades of successful application in critical magnetic shielding * **Specialized Heat Treatment:** Achieves optimal properties through specific thermal processing --- **Disclaimer:** *Hy-Mu is a registered trademark. The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier. Mu-Metal requires specialized heat treatment in a protective atmosphere (typically hydrogen) to achieve its optimal magnetic properties and is sensitive to mechanical stress after annealing.*

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1692 gallon liquid totes Special package is available on request.