new material
Expansion Alloy 4J34 is a high-performance material known for its excellent thermal expansion properties, mechanical strength, and compatibility with glass and ceramics. 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
4J34 is an iron-nickel-cobalt based controlled-expansion sealing alloy, specifically designed for sealing with materials like 95% alumina (Al2O3). It maintains a linear thermal expansion coefficient similar to that of ceramic materials within the temperature range of -60°C to +600°C, helping to avoid unwanted stress accumulation during temperature changes. This alloy is widely used in electronic packaging and precision instrument sealing applications.
Features
- Expansion Coefficient Similar to Ceramics: Matches the thermal expansion coefficient of 95% alumina and similar materials, ensuring stability at the sealing junction.
- Wide Temperature Range: Provides excellent expansion properties across the -60°C to +600°C temperature range.
- High Strength and Durability: Exhibits strong mechanical properties, making it suitable for long-term use.
Applications
- Ceramic Sealing: Used for high-precision sealing with alumina ceramics (e.g., 95% Al2O3) and similar materials.
- Precision Electronic Packaging: Ideal for sealing applications in electronic components and high-precision devices.
- High-Temperature Environments: Demonstrates excellent stability and mechanical strength, making it suitable for demanding high-temperature applications.
| C | P | S | Mn | Si | Ni | Co | Fe |
| Not more than（≤） | |||||||
| 0.05 | 0.02 | 0.02 | 0.5 | 0.3 | 28.5-29.5 | 19.5-20.5 | Balance |
| Heat Treatment Procedure | Average Linear Expansion Coefficient (ā)/（10-6/℃） | |
| 20-400℃ | 20-600℃ | |
| Heat to 900℃ ±20℃ in a protective atmosphere or vacuum, hold for 1 hour, and cool to below 200℃ at a rate not exceeding 5℃/min before removing from the furnace. | 6.3-7.1 | 7.8-8.5 |
