A-3 Alnico Magnetic Material,E FORU

### **Product Introduction: A-3 Alnico Magnetic Material** **A-3 Alnico** is an isotropic permanent magnet material from the Alnico family, recognized for its balanced magnetic properties and excellent thermal stability. As an isotropic grade, it can be magnetized in any direction without requiring orientation during manufacturing, making it particularly suitable for producing complex multi-pole magnetized components. This material maintains the characteristic advantages of Alnico magnets - high Curie temperature, outstanding temperature stability, and good corrosion resistance - while offering a cost-effective solution for applications requiring moderate magnetic performance with excellent structural integrity. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of A-3 Alnico is as follows: | Element | Content (%) | | :--- | :--- | | **Iron (Fe)** | Balance | | **Aluminum (Al)** | 7.5 - 9.5 | | **Nickel (Ni)** | 13.5 - 17.0 | | **Cobalt (Co)** | 11.0 - 14.0 | | **Copper (Cu)** | 2.5 - 4.0 | | **Titanium (Ti)** | 0.5 - 1.0 | | **Other Elements** | ≤ 1.0 | The balanced composition creates the characteristic two-phase microstructure that enables Alnico's unique magnetic properties through shape anisotropy. --- #### **2. Physical & Magnetic Properties** **Magnetic Properties (Typical at 20°C):** | Property | Value (Typical) | Unit | | :--- | :--- | :--- | | **Residual Induction (Bᵣ)** | 6.8 - 7.2 | kG (kiloGauss) | | **Coercivity (Hᶜ)** | 1.3 - 1.5 | kOe (kiloOersteds) | | **Intrinsic Coercivity (Hᶜⱼ)** | 1.4 - 1.6 | kOe (kiloOersteds) | | **Maximum Energy Product ((BH)ₘₐₓ)** | 1.3 - 1.6 | MGOe (Mega-Gauss Oersteds) | **Physical & Mechanical Properties:** | Property | Value | Unit | | :--- | :--- | :--- | | **Density** | 6.9 - 7.1 | g/cm³ | | **Coefficient of Thermal Expansion (20-500°C)** | ~11.2 | μm/m·°C | | **Curie Temperature (T𝒸)** | ~810 | °C | | **Maximum Operating Temperature** | ~450 | °C | | **Vickers Hardness** | ~450 | HV | | **Electrical Resistivity** | ~65 | μΩ·cm | | **Compressive Strength** | High | | | **Tensile Strength** | Brittle | | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** * **Isotropic Nature:** Can be magnetized in any direction, enabling complex magnetic circuits and multi-pole magnetization patterns * **Excellent Thermal Stability:** Reversible temperature coefficient of -0.02%/°C, with minimal irreversible losses after thermal cycling * **High Curie Temperature:** Maintains magnetic properties at elevated temperatures up to 450°C continuous operation * **Good Mechanical Strength:** High compressive strength and hardness, though brittle in nature * **Corrosion Resistance:** Inherently stable in most environments without requiring protective coatings * **Time Stability:** Excellent long-term stability with minimal aging effects **Product Applications:** A-3 Alnico finds applications across multiple industries where its isotropic nature and thermal stability are advantageous: * **Automotive Systems:** - Sensor rings for crankshaft and camshaft position sensing - Speed sensors in anti-lock braking systems - Small motor applications * **Industrial Equipment:** - Magnetic chucks and workholding devices - Holding magnets for fixtures and jigs - Reed switches and relay applications * **Consumer Products:** - Decorative magnets - Magnetic latches and closures - Educational and hobbyist kits * **Electromechanical Devices:** - Instrument motors - Hysteresis clutches - Moving coil instruments * **Aerospace and Defense:** - Sensors requiring stable performance across wide temperature ranges - Navigation instruments --- #### **4. International Standards & Specifications** A-3 Alnico is recognized in several international standards systems: * **IEC 60404-8-1:** International standard for permanent magnet materials, classified under isotropic Alnico grades * **National Standards:** - **China:** Classified under LN-8 series - **Russia:** Corresponds to YuNDK-22 grade - **Japan:** JIS C 2502 standard * **Industry Classifications:** - Commonly referred to as **Alnico 3** or **A-3** in industry specifications - Recognized in various military and aerospace specifications for sensor applications --- #### **Summary of Key Advantages** * **Manufacturing Flexibility:** Isotropic properties allow for cost-effective production of complex geometries and multi-pole magnetizations * **Thermal Performance:** Superior high-temperature capability compared to ferrite and rare-earth magnets * **Long-Term Reliability:** Exceptional stability against demagnetization and aging effects * **Corrosion Resistance:** Does not require protective coatings in most environments * **Cost-Effective:** Provides good magnetic performance at a competitive price point for isotropic applications **Note:** The material's brittle nature requires careful handling and diamond tooling for machining. Design should prioritize compressive loading rather than tensile or impact stresses.

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 3139 gallon liquid totes Special package is available on request.