new material
Expansion Alloy 4J33 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
4J33 is a controlled-expansion iron-nickel-cobalt alloy specially designed for sealing with materials such as 95% alumina (Al2O3). This alloy has a linear thermal expansion coefficient similar to that of 95% alumina within the temperature range of -60°C to +600°C, ensuring that no excessive stress is generated during temperature changes. It is widely used in high-precision sealing applications.
Features
- Similar Thermal Expansion Coefficient: The expansion coefficient is closely matched to that of 95% alumina, ensuring stability at the sealing junction during temperature variations.
- Wide Temperature Range: Maintains excellent expansion characteristics across a wide temperature range from -60°C to +600°C.
- High Strength: Provides sufficient mechanical strength and durability for long-term use.
Applications
- Ceramic Sealing: Commonly used for sealing with alumina ceramics (e.g., 95% Al2O3).
- Precision Sealing Technology: Suitable for high-temperature, high-precision sealing applications, such as electronic packaging and precision instrument manufacturing.
- High-Temperature Applications: Ideal for sealing components used in high-temperature environments.
| C | P | S | Mn | Si | Ni | Co | Fe |
| Not more than(≤) | |||||||
| 0.05 | 0.02 | 0.02 | 0.5 | 0.3 | 32.1-33.6 | 14.0-15.2 | Balance |
| Heat Treatment Procedure | Average Linear Expansion Coefficient (ā)/（10-6/℃） | |
| 20-400℃ | 20-500℃ | |
| Heat in a protective atmosphere or vacuum to 900°C±20°C, hold for 1 hour, then cool to below 200°C at a rate of no more than 5°C/min | 6.0-6.8 | 6.6-7.4 |
