new material
Expansion Alloy 4J80 (Nickel-Based Non-Magnetic Constant Expansion Ceramic Sealing Alloy) is a high-performance material known for its stable thermal expansion properties, excellent mechanical strength, and non-magnetic nature. This alloy is widely used in various industries, including electronics, aerospace, and telecommunications, where it serves in critical components exposed to demanding environments. Its unique properties make it ideal for applications requiring durability, reliability, and high performance.
Product Overview
4J80 alloy is a nickel-based, non-magnetic constant expansion alloy, primarily used for non-magnetic sealing components in specialized electronic instruments. It features a moderate linear thermal expansion coefficient within the temperature range of room temperature to 600°C, making it particularly suitable for vacuum brazing and edge welding with high-alumina ceramic materials. The alloy exhibits excellent expansion and high-temperature resistance properties, making it ideal for high-precision applications.
Features
- Moderate Expansion Coefficient: The alloy offers a moderate linear thermal expansion coefficient within the range of room temperature to 600°C, suitable for applications with strict temperature variation requirements.
- Non-Magnetic Properties: The alloy is non-magnetic, making it ideal for electronic devices and applications where magnetic interference must be avoided.
- Excellent Welding Performance: Particularly suitable for vacuum brazing and edge welding with ceramic materials.
Applications
- Specialized Electronic Instruments: Widely used in non-magnetic sealing components for high-precision electronic instruments.
- High-Alumina Ceramic Welding: Used for vacuum brazing with high-alumina ceramic materials.
- Edge Welding: Ideal for precision welding of electronic components and instruments.
- High-Precision Equipment: Extensively used in devices requiring non-magnetic properties and stable thermal expansion performance.
| C | P | S | Mn | Si | Mo | W | Cu | Ni |
| Not more than | ||||||||
| 0.05 | 0.02 | 0.02 | 0.4 | 0.3 | 9.5-11.5 | 9.5-11.5 | 1.5-2.5 | Balance |
| Tensile Strength (Rm) (N/mm2) | 725 |
| Yield Strength (Re) (N/mm2) | 285 |
| Modulus of Elasticity (E) (MPa) | 220,500 |
| Elongation (A) (%) | 55 |
| Hardness (HV) | 156 |
| Cup Value (N/mm2) | 12.6 |
| Resistivity (ρ) (Ω·mm²/m) | 0.88 |
| Density (γ) (g/mm²) | 9.67 |
| Thermal Conductivity (λ) (×10² W/(m·K)) | 20℃: 0.155 |
| 300℃: 0.167 | |
| 600℃: 0.214 |
| Heat Treatment Procedure | Average Linear Expansion Coefficient (ā)/（10-6/℃） | Magnetic Permeability μ200Gs/Oe | |
| Heat in a protective atmosphere or vacuum to 850-900°C, hold for 30-40 minutes, then cool to below 300°C at a rate of no more than 5°C/min | 20-500℃ | 20-600℃ | ≤1.001 |
| 12.7-13.3 | 13.0-13.6 | ||
