NILO Alloy 475 Controlled-Expansion Alloy,DIN 17745; 1

### **Product Introduction: NILO® Alloy 475 Controlled-Expansion Alloy** **NILO® Alloy 475** is a nickel-iron controlled-expansion alloy specifically engineered to provide a thermal expansion coefficient that closely matches various ceramic and glass materials. This precision alloy is part of the NILO (Nickel-Iron Low Expansion) series, designed for applications requiring exceptional dimensional stability and thermal compatibility between metal and non-metal components across specific temperature ranges. The alloy's carefully controlled composition ensures predictable thermal expansion behavior, making it particularly suitable for electronic packaging, precision instruments, and applications where reliable performance under thermal cycling conditions is critical. --- ### **Chemical Composition** | Element | Content (%) | |---------|-------------| | **Nickel (Ni)** | 46.0 - 48.0 | | **Iron (Fe)** | Balance | | **Cobalt (Co)** | 0.50 max | | **Manganese (Mn)** | 0.30 - 0.60 | | **Silicon (Si)** | 0.15 - 0.30 | | **Carbon (C)** | 0.05 max | | **Copper (Cu)** | 0.10 max | | **Chromium (Cr)** | 0.10 max | | **Aluminum (Al)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | --- ### **Physical Properties** | Property | Value | |----------|-------| | **Density** | 8.20 g/cm³ | | **Melting Point** | 1425 °C | | **Thermal Conductivity** | 13.5 W/m·K (at 20°C) | | **Electrical Resistivity** | 0.48 μΩ·m | | **Modulus of Elasticity** | 145 GPa | | **Mean Coefficient of Thermal Expansion** | 9.0 - 10.0 × 10⁻⁶/°C (20-400°C) | | **Specific Heat Capacity** | 505 J/kg·K | | **Curie Temperature** | 350 - 370 °C | --- ### **Mechanical Properties** **Annealed Condition:** - **Tensile Strength:** 500 - 600 MPa - **Yield Strength (0.2% Offset):** 270 - 350 MPa - **Elongation:** 35 - 45% - **Hardness:** 65 - 80 HRB **Cold Worked Condition:** - **Tensile Strength:** 600 - 800 MPa - **Yield Strength (0.2% Offset):** 450 - 650 MPa - **Elongation:** 12 - 25% - **Hardness:** 80 - 95 HRB --- ### **Heat Treatment** **Stress Relieving:** - **Temperature:** 400 - 525°C - **Time:** 1-2 hours - **Atmosphere:** Hydrogen or vacuum preferred **Annealing:** - **Temperature:** 750 - 850°C - **Cooling:** Controlled cooling rate required - **Atmosphere:** Protective atmosphere recommended --- ### **Key Characteristics & Advantages** 1. **Precision Thermal Expansion** - Controlled thermal expansion coefficient matching specific materials - Predictable and repeatable expansion behavior - Excellent dimensional stability across temperature ranges 2. **Superior Sealing Performance** - Compatible with various glass and ceramic compositions - Reliable hermetic sealing capabilities - Strong bonding characteristics 3. **Excellent Mechanical Properties** - Good strength-to-weight ratio - Excellent formability and machinability - Suitable for precision manufacturing processes 4. **Stable Performance Characteristics** - Consistent properties through thermal cycling - Resistance to thermal fatigue - Long-term reliability in sealed applications --- ### **Product Applications** **Electronics and Semiconductor:** - Integrated circuit packages - Microelectronic substrates - Power device packages - Hybrid circuit bases **Aerospace and Defense:** - Avionics housing components - Radar system packages - Military electronic systems - Satellite instrumentation **Industrial Applications:** - Glass-to-metal seals - Ceramic-to-metal joints - Precision measuring instruments - Optical system components **Specialized Applications:** - Sensor housings - Laser equipment components - Vacuum system parts - Scientific instrument frames --- ### **International Standards** | Standard Type | Standard Number | Description | |---------------|-----------------|-------------| | **DIN** | 17745 | German Standard for Nickel-Iron Alloys | | **Werkstoff Nr.** | 2.4486 | Material Number | | **AFNOR** | NF A54-301 | French Standard | --- ### **Summary** **NILO® Alloy 475** is a high-precision nickel-iron controlled-expansion alloy specifically formulated to provide exact thermal expansion characteristics for demanding technical applications. Its predictable thermal behavior and excellent dimensional stability make it an indispensable material for electronic packaging, precision instrumentation, and specialized sealing applications where thermal compatibility between different materials is essential. The alloy's reliable performance under thermal cycling conditions, combined with its good mechanical properties and manufacturing characteristics, ensures long-term reliability in critical applications ranging from consumer electronics to aerospace systems. Certification to major international standards including DIN 17745, Werkstoff 2.4486, and AFNOR NF A54-301 guarantees consistent quality and performance, providing engineers and designers with a trusted solution for applications requiring precise thermal matching and exceptional dimensional stability.

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 3344 gallon liquid totes Special package is available on request.