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Expansion Alloy 4J45 (Iron-Nickel-Cobalt Constant Expansion Sealing Alloy) is a high-performance material known for its stable thermal expansion properties, excellent 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
4J45 alloy is an iron-nickel-cobalt constant expansion sealing alloy widely used in the electrical vacuum industry for sealing with soft glass or ceramic materials. This alloy features a stable linear expansion coefficient within a specific temperature range, ensuring effective matching with the materials. It offers excellent sealing performance and stability.
Features
- Stable Expansion Coefficient: Provides a consistent linear expansion coefficient within a specific temperature range, ensuring compatibility with soft glass or ceramics.
- Excellent Sealing Performance: Ideal for high-precision sealing applications in electrical vacuum devices, ensuring both physical and chemical stability.
- Good High-Temperature Resistance: The alloy performs well in high-temperature environments, ensuring long-term stability in the electrical vacuum industry.
Applications
- Electrical Vacuum Industry: Used for sealing with soft glass or ceramic materials.
- High-Precision Sealing Applications: Suitable for sealing in applications requiring stable and precise expansion properties.
- Electronic Sealing: Used for reliable sealing in electrical vacuum electronic devices.
| C | P | S | Mn | Si | Al | Ni | Fe |
| Not more than（≤） | |||||||
| 0.05 | 0.02 | 0.02 | 0.8 | 0.3 | 0.1 | 44.5-45.5 | Balance |
| Heat Treatment Procedure | Average Linear Expansion Coefficient (ā)/（10-6/℃） | |
| 20-300℃ | 20-450℃ | |
| Heat the sample in a hydrogen atmosphere to 900°C ± 20°C and hold for 1 hour. Then, cool it down to below 200°C at a rate not exceeding 5°C per minute before removing it from the furnace. | 6.5-7.2 | 6.5-7.2 |
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