Alloy 52,Glass sealing 52 Alloy,UNS N14052,E FORU

### **Alloy 52 / Glass Sealing 52 Alloy / UNS N14052** **Nickel-Iron Alloy for High-Reliability Glass and Ceramic Sealing Applications** --- #### **1. Overview** **Glass Sealing 52 Alloy**, commercially designated as **Alloy 52**, is a nickel-iron alloy specifically engineered to provide superior thermal expansion matching with high-performance borosilicate glasses and advanced ceramics. With its high nickel content, this alloy offers exceptional corrosion resistance, excellent high-temperature stability, and superior sealing characteristics compared to lower nickel-content iron-nickel alloys. Alloy 52 is particularly valued for applications requiring long-term reliability in harsh environments and elevated temperature conditions. --- #### **2. Chemical Composition (Weight %)** The typical chemical composition of Alloy 52 is outlined below. The balance is Nickel (Ni). | Element | Content (%) | Key Function | | :--- | :--- | :--- | | **Nickel (Ni)** | Balance | Forms the primary matrix, providing fundamental corrosion resistance and controlling thermal expansion. | | **Iron (Fe)** | 46.0 - 48.0 | Balances the nickel content to achieve specific thermal expansion characteristics. | | **Manganese (Mn)** | 0.30 - 0.60 | Enhances hot workability and acts as a deoxidizer during manufacturing. | | **Silicon (Si)** | 0.15 - 0.25 | Improves oxidation resistance and enhances glass wetting characteristics. | | **Carbon (C)** | 0.03 max | Minimized to prevent gas formation during high-temperature sealing processes. | | **Chromium (Cr)** | 0.10 max | Controlled impurity element. | | **Cobalt (Co)** | 0.10 max | Controlled impurity element. | | **Copper (Cu)** | 0.10 max | Controlled impurity element. | | **Aluminum (Al)** | 0.05 max | Carefully regulated to ensure optimal oxide formation for glass bonding. | | **Titanium (Ti)** | 0.05 max | Controlled trace element. | | **Sulfur (S)** | 0.010 max | Minimized to ensure material purity and prevent hot shortness. | | **Phosphorus (P)** | 0.010 max | Controlled to maintain ductility and sealing performance. | --- #### **3. Physical Properties** | Property | Value / Condition | | :--- | :--- | | **Density** | 8.25 g/cm³ (0.298 lb/in³) | | **Melting Point** | ~ 1430 °C (2606 °F) | | **Mean Coefficient of Thermal Expansion** | 20 - 300°C (68 - 572°F): **9.5 x 10⁻⁶/°C** (5.3 x 10⁻⁶/°F)
20 - 400°C (68 - 752°F): **10.3 x 10⁻⁶/°C** (5.7 x 10⁻⁶/°F)
20 - 500°C (68 - 932°F): **11.2 x 10⁻⁶/°C** (6.2 x 10⁻⁶/°F) | | **Thermal Conductivity** | 16.2 W/m·K (112 Btu·in/hr·ft²·°F) at 20°C (68°F) | | **Specific Heat Capacity** | 502 J/kg·K (0.120 Btu/lb·°F) at 20°C (68°F) | | **Electrical Resistivity** | 0.58 μΩ·m at 20°C (68°F) | | **Modulus of Elasticity (Young's Modulus)** | 155 GPa (22.5 x 10⁶ psi) at 20°C (68°F) | | **Curie Temperature** | ~ 520 °C (968 °F) | | **Magnetic Properties** | Ferromagnetic below Curie temperature | --- #### **4. Mechanical Properties (Typical for Annealed Condition)** | Property | Value at Room Temperature | | :--- | :--- | | **Tensile Strength** | 580 MPa (84 ksi) | | **Yield Strength (0.2% Offset)** | 410 MPa (59 ksi) | | **Elongation (in 50 mm / 2 in)** | 24% | | **Reduction of Area** | 56% | | **Hardness (Rockwell B)** | 86 HRB | | **Vickers Hardness** | 180 HV | --- #### **5. International Standards** Alloy 52 complies with the following international specifications: * **ASTM:** * **F2562:** Standard Specification for 52Ni-48Fe Alloy (Alloy 52) Sealing Glass * **AMS:** * **AMS 7725:** Sheet, Strip, and Plate * **UNS:** N14052 * **ISO:** * **ISO 19960:** Iron-nickel low expansion alloys * **JIS:** * **JIS C 2531:** Iron-nickel alloy for sealing use * **IEC:** * **IEC 60680:** Test methods of glass-to-metal sealing * **MIL:** * **MIL-I-23011:** Insulating Compound, Electrical (for Sealing Applications) --- #### **6. Product Applications** Alloy 52 is essential in high-reliability applications requiring superior sealing performance: * **High-Reliability Electronics:** * Aerospace and military electronic packages * Satellite communication components * Radar system housings * Missile guidance system seals * **Power Electronics:** * High-power semiconductor packages * IGBT and thyristor housings * Power module bases * **High-voltage feedthroughs** * **Medical Devices:** * Implantable medical electronics * Diagnostic imaging equipment * Life support system components * Surgical instrument seals * **Oil & Gas Industry:** * Downhole electronics packaging * High-temperature sensor housings * Subsea equipment seals * Geothermal instrumentation * **Advanced Research:** * Particle accelerator components * Nuclear research equipment * High-vacuum system seals * Cryogenic instrumentation --- #### **7. Key Characteristics & Advantages** * **Superior Thermal Matching:** CTE of 9.5-11.2 x 10⁻⁶/°C optimized for high-performance borosilicate glasses and advanced ceramics * **Excellent Corrosion Resistance:** Superior to lower nickel alloys in harsh chemical environments * **High Temperature Capability:** Maintains mechanical properties and seal integrity at elevated temperatures * **Enhanced Mechanical Strength:** Higher strength compared to traditional iron-nickel sealing alloys * **Superior Sealing Reliability:** Excellent for critical applications requiring long-term hermeticity * **Good Electrical Properties:** Suitable for high-frequency and high-current applications * **Excellent Fabricability:** Can be precision-formed and machined to tight tolerances * **Proven Performance:** Extensive successful use in the most demanding sealing applications --- **Disclaimer:** *The values provided are typical and for informational purposes only. For critical applications, always consult the official material data sheets from the supplier and relevant design codes. Optimal sealing performance requires specialized surface preparation and controlled oxidation processes.*

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 1690 gallon liquid totes Special package is available on request.