A-8 Alnico Magnetic Material,E FORU

### **Product Introduction: A-8 Alnico Magnetic Material** **A-8 Alnico** represents the pinnacle of Alnico magnet technology, offering the highest coercivity among all commercial Alnico grades. This anisotropic permanent magnet material is specifically engineered for applications requiring exceptional stability under extreme demagnetizing conditions and elevated temperatures. With its superior magnetic hardness and outstanding thermal stability, A-8 Alnico maintains reliable performance in the most demanding environments where other magnetic materials would fail. The material's unique combination of high coercivity and excellent temperature characteristics makes it indispensable for precision instruments and applications where consistent magnetic field strength is critical over wide temperature ranges and under strong reverse fields. --- #### **1. Chemical Composition (Weight %)** The typical chemical composition of A-8 Alnico is as follows: | Element | Content (%) | |---------|-------------| | **Iron (Fe)** | Balance | | **Aluminum (Al)** | 6.5 - 7.5 | | **Nickel (Ni)** | 13.5 - 15.5 | | **Cobalt (Co)** | 34.0 - 36.0 | | **Copper (Cu)** | 2.8 - 3.5 | | **Titanium (Ti)** | 4.5 - 5.5 | | **Niobium (Nb)** | 0.3 - 0.8 | | **Silicon (Si)** | 0.1 - 0.3 | | **Other Elements** | ≤ 0.2 | --- #### **2. Physical & Magnetic Properties** **Magnetic Properties (Typical at 20°C):** | Property | Value (Typical) | Unit | |----------|-----------------|------| | **Residual Induction (Bᵣ)** | 7.8 - 8.5 | kG | | **Coercivity (Hᶜ)** | 4.8 - 5.5 | kOe | | **Intrinsic Coercivity (Hᶜⱼ)** | 5.0 - 5.8 | kOe | | **Maximum Energy Product ((BH)ₘₐₓ)** | 5.0 - 5.8 | MGOe | **Physical & Mechanical Properties:** | Property | Value | Unit | |----------|-------|------| | **Density** | 7.30 - 7.40 | g/cm³ | | **Coefficient of Thermal Expansion** | 11.0 - 11.8 | μm/m·°C | | **Curie Temperature** | 860 - 880 | °C | | **Maximum Operating Temperature** | 550 - 600 | °C | | **Vickers Hardness** | 580 - 650 | HV | | **Electrical Resistivity** | 85 - 105 | μΩ·cm | | **Compressive Strength** | 1000 - 1250 | MPa | | **Flexural Strength** | 200 - 260 | MPa | | **Temperature Coefficient of Bᵣ** | -0.015 to -0.020 | %/°C | --- #### **3. Key Characteristics & Product Applications** **Key Characteristics:** - **Ultra-High Coercivity**: Exceptional resistance to demagnetization, the highest among commercial Alnico grades - **Superior Thermal Stability**: Maintains magnetic properties at extreme temperatures up to 600°C - **Excellent Linearity**: Provides stable and predictable magnetic field characteristics - **Outstanding Corrosion Resistance**: Inherent stability in harsh environments without coatings - **Anisotropic Performance**: Maximum magnetic properties when properly oriented and magnetized - **Exceptional Long-Term Stability**: Minimal aging effects over extended service life **Product Applications:** A-8 Alnico is essential for the most demanding applications where magnetic stability is critical: - **Aerospace and Defense Systems**: - Aircraft engine sensors and monitoring systems - Satellite attitude control and positioning systems - Military radar and communication equipment - Guidance system components - **Scientific and Research Instruments**: - Mass spectrometers and particle accelerators - Electron microscopy systems - Nuclear magnetic resonance equipment - High-precision laboratory instruments - **Medical Equipment**: - MRI system components - Radiation therapy devices - Surgical navigation systems - Medical imaging equipment - **Industrial Measurement and Control**: - High-temperature flow meters - Precision position sensors - Process control instruments - Quality assurance equipment - **Specialty Motors and Generators**: - Aerospace motors - High-temperature servo motors - Instrument motors - Specialized generator systems --- #### **4. International Standards & Specifications** A-8 Alnico meets the following international standards: - **IEC 60404-8-1**: International standard for permanent magnet materials - **ASTM A894/A894M**: Standard specification for aged permanent magnet alloys - **ISO 17556**: International standard for permanent magnet materials - **Regional Standards**: - **Europe**: EN 10303 equivalent specifications - **Japan**: JIS C 2502 compliant - **China**: GB/T 17951.9 similar classification - **Industry Certifications**: - Aerospace quality standards (AS/EN9100) - Military specifications compliance - Medical device regulations (where applicable) - RoHS and REACH environmental compliance --- #### **Summary of Key Advantages** - **Unmatched Coercivity**: Highest resistance to demagnetization in the Alnico family - **Extreme Temperature Capability**: Reliable performance up to 600°C continuous service - **Superior Stability**: Excellent resistance to external magnetic fields and temperature variations - **Premium Mechanical Properties**: Outstanding hardness and strength characteristics - **Long-Term Reliability**: Proven performance with minimal degradation over time - **Environmental Resistance**: Natural corrosion resistance in demanding applications **Technical Note**: A-8 Alnico requires careful attention to orientation during manufacturing and magnetization processes to achieve optimal anisotropic properties. The high titanium content contributes to its exceptional coercivity but requires precise heat treatment control. Machining operations demand diamond tools and specialized techniques due to the material's extreme hardness and brittleness. Proper thermal magnetic treatment is essential for developing the full magnetic potential of this premium grade material.

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 3145 gallon liquid totes Special package is available on request.