A-57 Cast Alnico Magnet,E FORU

### **Product Introduction: A-57 Cast Alnico Magnet** **A-57 Cast Alnico** is a high-performance anisotropic permanent magnet material from the Alnico family, manufactured through traditional casting processes. As an anisotropic grade, it exhibits superior magnetic properties when magnetized along its preferred crystallographic orientation, making it ideal for applications requiring maximum magnetic energy in a specific direction. This material represents one of the premium grades in the Alnico family, offering an excellent balance of high residual induction and good coercivity, combined with the characteristic Alnico advantages of outstanding thermal stability and long-term reliability. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of A-57 Cast Alnico is as follows: | Element | Content (%) | | :--- | :--- | | **Iron (Fe)** | Balance | | **Aluminum (Al)** | 7.5 - 8.5 | | **Nickel (Ni)** | 13.5 - 15.0 | | **Cobalt (Co)** | 23.5 - 25.0 | | **Copper (Cu)** | 2.8 - 3.5 | | **Titanium (Ti)** | 0.3 - 0.8 | | **Niobium (Nb)** | 0.8 - 1.2 | | **Silicon (Si)** | 0.2 - 0.5 | | **Other Elements** | ≤ 0.3 | The carefully balanced composition, particularly the optimized cobalt and titanium content, enables the development of strong magnetic anisotropy during heat treatment in a magnetic field. --- #### **2. Physical & Magnetic Properties** **Magnetic Properties (Typical at 20°C):** | Property | Value (Typical) | Unit | | :--- | :--- | :--- | | **Residual Induction (Bᵣ)** | 12.8 - 13.2 | kG (kiloGauss) | | **Coercivity (Hᶜ)** | 1.5 - 1.7 | kOe (kiloOersteds) | | **Intrinsic Coercivity (Hᶜⱼ)** | 1.6 - 1.8 | kOe (kiloOersteds) | | **Maximum Energy Product ((BH)ₘₐₓ)** | 7.0 - 7.5 | MGOe (Mega-Gauss Oersteds) | **Physical & Mechanical Properties:** | Property | Value | Unit | | :--- | :--- | :--- | | **Density** | 7.3 - 7.4 | g/cm³ | | **Coefficient of Thermal Expansion (20-500°C)** | ~11.8 | μm/m·°C | | **Curie Temperature (T𝒸)** | ~850 | °C | | **Maximum Operating Temperature** | ~525 | °C | | **Vickers Hardness** | ~550 | HV | | **Electrical Resistivity** | ~80 | μΩ·cm | | **Compressive Strength** | 850 - 1100 | MPa | | **Flexural Strength** | 180 - 230 | MPa | | **Temperature Coefficient of Bᵣ** | -0.02 | %/°C | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** * **Anisotropic Nature:** Requires magnetization along preferred orientation but delivers superior magnetic performance in that direction * **Excellent Thermal Stability:** Maintains magnetic properties at elevated temperatures up to 525°C * **High Residual Induction:** Provides strong magnetic field strength * **Good Coercivity Balance:** Offers reasonable resistance to demagnetization * **Outstanding Long-Term Stability:** Minimal aging effects over decades of service * **Excellent Corrosion Resistance:** Inherently stable in most environments without coating requirements **Product Applications:** A-57 Cast Alnico finds applications in demanding environments where thermal stability and reliability are critical: * **Aerospace & Defense:** - Gyroscope systems and navigation instruments - Satellite positioning systems - Aircraft sensors and control systems * **Scientific Instruments:** - Mass spectrometers - Electron microscopes - NMR instrumentation - Particle accelerator components * **Industrial Equipment:** - High-temperature motors and generators - Magnetic bearings - Precision measuring instruments - Process control sensors * **Automotive Applications:** - High-performance sensor systems - Ignition components for racing applications - Specialty motor applications * **Medical Equipment:** - MRI auxiliary components - Medical analyzer systems - Surgical instrument positioning systems --- #### **4. International Standards & Specifications** A-57 Cast Alnico conforms to several international standards: * **IEC 60404-8-1:** International standard for permanent magnet materials * **ASTM A894/A894M:** Standard specification for aged permanent magnet alloys * **Military Standards:** MIL-M-10319 (historical reference) * **National Standards:** - **China:** GB/T 17951.7 (similar classification) - **Russia:** YuNDK-35TBA equivalent - **Japan:** JIS C 2502-7-XXX * **Industry Specifications:** - Often specified as **Alnico 8** or **AN-800** in industry documentation - Recognized in aerospace and military specifications for critical applications --- #### **Summary of Key Advantages** * **Premium Magnetic Performance:** High energy product with excellent thermal stability * **Superior Temperature Capability:** Reliable operation up to 525°C continuous service * **Anisotropic Optimization:** Maximum magnetic performance in preferred orientation * **Exceptional Longevity:** Decades of stable performance with minimal degradation * **Robust Mechanical Properties:** Suitable for demanding industrial environments * **Corrosion Resistance:** No protective coatings required in most applications **Manufacturing Note:** The casting process allows for production of complex shapes and large sizes, while the anisotropic nature requires careful orientation during magnetization. Machining requires diamond tools due to material hardness and brittleness. Proper heat treatment in magnetic field is essential for achieving specified magnetic properties.

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 3141 gallon liquid totes Special package is available on request.