A-2 Alnico Magnetic Material,E FORU

### **Product Introduction: A-2 Alnico Magnetic Material** **A-2 Alnico** is a member of the Alnico family, which is a class of permanent magnet materials known for their excellent magnetic stability, high residual induction, and superior performance at elevated temperatures. The name "Alnico" is derived from its primary alloying elements: **Al**uminum, **Ni**ckel, and **Co**balt. A-2 is an **isotropic** Alnico grade, meaning it can be magnetized in any direction without a preferred magnetic orientation. This characteristic, combined with its good castability, makes it a versatile and cost-effective choice for producing complex magnet shapes. It offers a balanced combination of magnetic properties, good mechanical strength, and outstanding resistance to demagnetization at high temperatures, making it suitable for a wide range of industrial and consumer applications. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of A-2 Alnico is as follows: | Element | Content (%) | | :--- | :--- | | **Iron (Fe)** | Balance | | **Aluminum (Al)** | 8.0 - 10.0 | | **Nickel (Ni)** | 13.0 - 17.0 | | **Cobalt (Co)** | 11.5 - 14.5 | | **Copper (Cu)** | 2.5 - 4.5 | | **Titanium (Ti)** | 0.5 - 1.5 | | **Other Elements** | ≤ 1.0 | The balance of these elements creates a microstructure that is critical for its magnetic properties, typically featuring a fine-scale precipitation of ferromagnetic particles within a non-magnetic matrix. --- #### **2. Physical & Magnetic Properties** Typical physical and magnetic properties for A-2 Alnico are provided below. **Magnetic Properties (Typical at 20°C):** | Property | Value (Typical) | Unit | | :--- | :--- | :--- | | **Residual Induction (Bᵣ)** | 7.0 - 7.5 | kG (kiloGauss) | | **Coercivity (Hᶜ)** | 1.4 - 1.6 | kOe (kiloOersteds) | | **Intrinsic Coercivity (Hᶜⱼ)** | 1.5 - 1.7 | kOe (kiloOersteds) | | **Maximum Energy Product ((BH)ₘₐₓ)** | 1.4 - 1.8 | MGOe (Mega-Gauss Oersteds) | **Physical & Mechanical Properties:** | Property | Value | Unit | | :--- | :--- | :--- | | **Density** | 7.0 - 7.1 | g/cm³ | | **Coefficient of Thermal Expansion (20-500°C)** | ~11.0 | μm/m·°C | | **Curie Temperature (T𝒸)** | ~850 | °C | | **Compressive Strength** | Very High | | | **Tensile Strength** | Low / Brittle | | | **Vickers Hardness** | ~500 | HV | | **Electrical Resistivity** | ~70 | μΩ·cm | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** * **Isotropic:** Can be magnetized in any direction, offering great design flexibility. * **High Temperature Stability:** Can operate continuously at temperatures up to 450-500°C (842-932°F) with minimal irreversible loss of magnetic strength. * **Excellent Long-Term Stability:** Exhibits very low magnetic aging losses over time. * **High Residual Induction (Bᵣ):** Provides strong magnetic field strength. * **Brittle and Hard:** Has good compressive strength but is brittle and must be used with care; it is typically ground with diamond tools. * **Good Corrosion Resistance:** Generally stable and does not require plating or coating for most environments. **Product Applications:** Due to its isotropic nature and robust properties, A-2 Alnico is widely used in: * **Sensors:** Proximity sensors, position sensors, and speed sensors (e.g., in automotive crankshaft and camshaft position sensors). * **Electromechanical Devices:** Holding magnets, magnetic chucks, and relays. * **Consumer Products:** Decorative magnets, magnetic latches for cabinets and doors, and toys. * **Loudspeakers:** Used in some older or specialized speaker designs. * **Motors and Generators:** Found in small hysteresis motors, instrument motors, and some educational generator kits. * **Aerospace and Defense:** Components requiring stable performance under varying temperature conditions. --- #### **4. International Standards & Specifications** While often specified by manufacturer data sheets, A-2 Alnico is recognized in several international classification systems. * **IEC 60404-8-1:** International Electrotechnical Commission standard for permanent magnet materials. A-2 would fall under the general "Isotropic Alnico" classification. * **National/Historical Standards:** * It was historically classified under standards like **MIL-M-10319** (US Military Standard). * In China, it corresponds to **LN-9**. * In Russia and former Soviet states, a similar grade is known as **YuNDK-24**. * **Industry Practice:** Most suppliers and users refer to it by its common name, **Alnico 2** or **A-2**, and rely on standardized producer data sheets for procurement. --- #### **Summary of Key Advantages** * **Design Flexibility:** Its isotropic nature allows for cost-effective production of complex multi-pole magnetizations. * **High-Temperature Performance:** Superior to many other magnet materials (like Ferrite and NdFeB) in high-temperature environments. * **Robustness and Stability:** Excellent resistance to demagnetization and very stable magnetic output over time and under thermal cycling. * **Cost-Effective:** Generally less expensive than anisotropic Alnico grades and high-performance rare-earth magnets, making it ideal for cost-sensitive applications. **Disclaimer:** The information provided here is for reference purposes. Specific magnetic and physical properties can vary depending on the manufacturing process and heat treatment. For critical applications, always consult the official material specifications and the producer's data sheets.

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 3138 gallon liquid totes Special package is available on request.