Nickel 62/Silicon 38 Alloy,Nickel Silicon Alloy.Ni38Si Alloy，1

### **Nickel 62/Silicon 38 Alloy (Ni₆₂Si₃₈) - High-Silicon Nickel Alloy** #### **Overview** **Nickel 62/Silicon 38 Alloy** is a specialized nickel-silicon intermetallic compound known for its exceptional hardness, excellent high-temperature stability, and outstanding wear resistance. With a silicon content of approximately 38%, this alloy forms hard nickel silicide phases that provide superior performance in demanding applications requiring resistance to abrasion, oxidation, and thermal degradation. The material is particularly valued for its use in brazing alloys, hard-facing applications, and high-temperature structural components. --- #### **Chemical Composition (Weight %)** | Element | Content (%) | Function | |---------|-------------|-----------| | **Nickel (Ni)** | **60.0-64.0%** | Base element providing matrix strength and corrosion resistance | | **Silicon (Si)** | **36.0-40.0%** | Primary alloying element forming hard silicide phases | | **Iron (Fe)** | **≤ 1.0%** | Controlled impurity | | **Carbon (C)** | **≤ 0.10%** | Limited to prevent carbide formation | | **Manganese (Mn)** | **≤ 0.5%** | Deoxidizer during processing | | **Chromium (Cr)** | **≤ 0.5%** | Optional addition for enhanced oxidation resistance | | **Other Elements** | **≤ 0.5%** | Controlled impurities | --- #### **Physical & Mechanical Properties** | Property | Value / Description | |----------|---------------------| | **Density** | **6.80-7.00 g/cm³** | | **Melting Point** | **1150-1250°C** (2102-2282°F) | | **Electrical Resistivity** | **80-120 μΩ·cm** (at 20°C) | | **Thermal Conductivity** | **18-25 W/m·K** (at 20°C) | | **Coefficient of Thermal Expansion** | **13.0-15.0 × 10⁻⁶/°C** (20-800°C) | | **Specific Heat Capacity** | **480-550 J/kg·K** | | **Microhardness** | **600-800 HV** | | **Compressive Strength** | **1500-2000 MPa** | | **Fracture Toughness** | **Low to Moderate** | | **Young's Modulus** | **180-220 GPa** | | **Oxidation Resistance** | **Excellent up to 1000°C** (1832°F) | --- #### **Key Characteristics & Applications** **Key Characteristics:** - **Exceptional Hardness**: High microhardness due to nickel silicide formation - **Excellent Wear Resistance**: Superior performance in abrasive environments - **Good High-Temperature Stability**: Maintains properties at elevated temperatures - **Outstanding Oxidation Resistance**: Forms protective silica-rich surface layer - **Brittle Nature**: Limited ductility and fracture toughness - **Good Corrosion Resistance**: Resists many corrosive environments **Typical Applications:** - **Brazing Alloys**: High-temperature brazing filler metals for joining superalloys - **Hard-Facing Applications**: Wear-resistant coatings for industrial equipment - **Thermal Spray Powders**: Coatings for high-temperature corrosion protection - **Aerospace Components**: High-temperature fixtures and tooling - **Chemical Processing**: Equipment requiring wear and corrosion resistance - **Power Generation**: Components for high-temperature service - **Metal Matrix Composites**: Reinforcement phase in composite materials --- #### **International Standards & Specifications** | Standard | Designation | Description | |----------|-------------|-------------| | **ASTM** | **B774** | Standard specification for nickel alloy castings | | **AWS** | **A5.8** | Specification for brazing filler metals | | **ISO** | **17672** | Brazing - Filler metals | | **AMS** | **4777** | Nickel alloy brazing foil | | **DIN** | **8513** | German standard for brazing filler metals | | **JIS** | **Z3265** | Japanese standard for nickel brazing materials | --- #### **Manufacturing & Processing** **Available Forms:** - **Powder**: Gas-atomized powder for thermal spraying and brazing - **Ingot**: For remelting and casting applications - **Foil**: Thin foil for brazing applications - **Rod**: For welding and hard-facing applications - **Custom Shapes**: Cast or machined components **Processing Guidelines:** - **Melting**: Requires controlled atmosphere or vacuum melting - **Casting**: Suitable for investment and sand casting processes - **Powder Production**: Gas atomization for spherical powders - **Heat Treatment**: Stress relief and homogenization treatments available - **Machining**: Requires diamond tools or grinding due to high hardness --- #### **Quality Control & Testing** - **Chemical Analysis**: Verification of silicon and nickel content - **Hardness Testing**: Microhardness measurement for quality assurance - **Metallographic Examination**: Phase identification and microstructure analysis - **Powder Characteristics**: Particle size distribution and flowability testing - **Brazing Performance**: Wetting and flow characteristics evaluation - **High-Temperature Testing**: Oxidation resistance and thermal stability assessment --- #### **Comparison with Related Alloys** | Property | Ni₆₂Si₃₈ | Ni₈₀Si₂₀ | Ni₈₉P₁₁ (Nickel Phosphide) | |----------|-----------|-----------|----------------------------| | **Silicon Content** | 36-40% | 18-22% | 0% | | **Hardness** | Very High | High | Moderate | | **Melting Point** | 1150-1250°C | 1200-1300°C | 880-890°C | | **Primary Application** | Hard-facing, Brazing | Brazing, Coatings | Brazing, Electronics | --- #### **Summary** **Nickel 62/Silicon 38 Alloy** represents a specialized high-silicon nickel alloy that delivers exceptional hardness, outstanding wear resistance, and excellent high-temperature performance. Its unique combination of properties makes it particularly valuable for demanding applications in brazing, hard-facing, and high-temperature structural components. While the alloy's brittle nature requires careful processing and application, its superior performance in aggressive environments justifies its use in specialized industrial applications. The established manufacturing processes and comprehensive quality standards ensure consistent performance and reliability, making Ni₆₂Si₃₈ a critical material for advanced engineering applications where conventional materials would fail.

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 3231 gallon liquid totes Special package is available on request.