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

British Specs:，American Specs: ASTM F30，German Specs:

### **Alloy 52 (Glass Sealing 52) - Product Overview** **Alloy 52** is a nickel-iron controlled expansion alloy specifically designed for making matched seals with borosilicate hard glasses. This alloy offers an excellent combination of thermal expansion characteristics, mechanical properties, and glass sealing performance, making it suitable for applications requiring reliable hermetic seals in demanding environments. * **UNS Designation:** **N14052** * **Common Names:** Glass Sealing 52, 52Ni-Fe Alloy --- #### **1. Chemical Composition** The chemical composition is carefully balanced to achieve optimal thermal expansion matching with hard glasses. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 51.0 - 52.5 | Primary element controlling CTE characteristics | | **Iron (Fe)** | Balance | Base structural element | | **Manganese (Mn)** | 0.10 - 0.30 | Enhances workability and acts as deoxidizer | | **Silicon (Si)** | 0.10 - 0.30 | Improves glass wetting characteristics | | **Carbon (C)** | 0.05 max | Limited to prevent embrittlement | | **Sulfur (S)** | 0.02 max | Controlled impurity | | **Phosphorus (P)** | 0.02 max | Controlled impurity | | **Cobalt (Co)** | 0.50 max | Accidental impurity | --- #### **2. Physical Properties** Specialized physical properties optimized for hard glass sealing applications. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.25 g/cm³ (0.298 lb/in³) | | | **Melting Point** | ~1435 °C (2615 °F) | | | **Curie Temperature** | ~500 °C (930 °F) | Higher than Alloy 48 for different CTE profile | | **Thermal Expansion Coefficient (CTE)** | 20-300°C: 9.8-10.5 μm/m·°C
20-400°C: 10.2-10.8 μm/m·°C | Matches specific borosilicate glass types | | **Thermal Conductivity** | 15.5 W/m·K at 20°C | | | **Specific Heat** | 0.46 J/g·°C at 20°C | | | **Electrical Resistivity** | 0.47 μΩ·m at 20°C | | | **Magnetic Properties** | Ferromagnetic below Curie point | | --- #### **3. Mechanical Properties** Typical properties in annealed condition. * **Tensile Strength:** 530-600 MPa (77-87 ksi) * **Yield Strength (0.2% Offset):** 290-360 MPa (42-52 ksi) * **Elongation:** 30-40% in 2 inches * **Modulus of Elasticity:** 156 GPa (22.6 × 10⁶ psi) * **Hardness (Rockwell B):** 70-85 * **Shear Modulus:** 61 GPa (8.8 × 10⁶ psi) --- #### **4. Product Forms & Specific Applications** **Available Forms:** * Sheet & Strip (0.05 mm to 3.0 mm thickness) * Wire (0.1 mm to 6.0 mm diameter) * Rod & Bar (3.0 mm to 150 mm diameter) * Tubing & Pipe * Custom forgings and fabricated components **Primary Applications:** * **Hard Glass Sealing:** Matched seals with specific borosilicate glasses * **Aerospace Electronics:** Critical avionics packages and satellite components * **High-Temperature Lamps:** Seals for high-intensity discharge and specialty lighting * **Microwave Tubes:** Components for radar and communication systems * **Semiconductor Processing:** Equipment components requiring hard glass seals * **Medical Devices:** Implantable device packages and diagnostic equipment * **Scientific Instruments:** Precision instrumentation and laboratory equipment * **Power Electronics:** High-reliability packages for power devices --- #### **5. International Standards** Comprehensive international standardization. | Standard Type | Standard Number | Title / Specification | |:---|:---|:---| | **ASTM** | **ASTM F15** | Standard Specification for Iron-Nickel Sealing Alloys | | **UNS** | **N14052** | Unified Numbering System Designation | | **AMS** | AMS 7723 | Aerospace Material Specification | | **IEC** | IEC 60404-8-6 | Metallic Magnetic Materials Specification | | **DIN** | DIN 1745 | Metallic Materials for Glass-to-Metal Seals | | **JIS** | JIS H 7541 | Alloys for Glass-to-Metal Seals | | **ISO** | ISO 9711 | Metallic Materials for Glass-to-Metal Seals | --- #### **6. Glass Sealing Performance** **Compatible Glass Types:** * Specific borosilicate glass compositions * Corning 7052, 7056 equivalent types * Schott AR-Glass series * Various alumina-silicate compositions **Sealing Characteristics:** * Optimal sealing temperature range: 950-1050°C * Requires controlled atmosphere (hydrogen or vacuum) * Excellent wetting with compatible hard glasses * Minimal interfacial stress during cooling * Superior thermal cycle resistance --- #### **7. Comparison with Other Sealing Alloys** | Property | Alloy 52 | Alloy 48 | Alloy 46 | |:---|:---|:---|:---| | **Nickel Content** | 52% | 48% | 46% | | **CTE (20-300°C)** | 9.8-10.5 μm/m·°C | 8.5-9.2 μm/m·°C | 9.2-9.8 μm/m·°C | | **Curie Temperature** | ~500°C | ~480°C | ~430°C | | **Primary Glass Match** | Specific Hard Glasses | Hard Glasses | Soft Glasses | --- #### **8. Manufacturing Considerations** * **Machining:** Good machinability with proper tool geometry and cooling * **Forming:** Excellent cold working characteristics in annealed condition * **Welding:** Suitable for TIG, resistance, and laser welding methods * **Heat Treatment:** Annealing at 850-900°C in protective atmosphere * **Surface Preparation:** Critical for optimal glass sealing performance --- **Summary** **Alloy 52 (Glass Sealing 52, UNS N14052)** represents a specialized member of the iron-nickel sealing alloy family, specifically optimized for particular hard glass applications. Its carefully controlled thermal expansion characteristics, combined with excellent mechanical properties and reliable sealing performance, make it the material of choice for demanding applications in aerospace, defense, medical, and high-reliability industrial sectors. The alloy's ability to maintain hermetic integrity under thermal cycling conditions while matching the expansion of specific hard glasses ensures long-term reliability in critical sealing applications. Compliance with international standards including **ASTM F15** guarantees consistent material quality and performance across all product forms and manufacturing 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 2508 gallon liquid totes Special package is available on request.