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Expansion Alloy 4J28 (Glass Sealed Iron-Chromium Alloy) is a high-performance material known for its excellent thermal expansion properties, corrosion resistance, and compatibility with soft glass. This alloy is widely used in various industries, including electronics, precision measurement tools, and cryogenic engineering, 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
4J28 (Alloy 27) is a glass-sealed iron-chromium alloy specifically designed for sealing electrical components with soft glass. It has a linear expansion coefficient similar to that of soft glass within a certain temperature range and offers good corrosion resistance. This alloy is primarily used in electrical vacuum and electronic devices, providing stable sealing performance.
Features
- Stable Expansion Coefficient: Matches the expansion coefficient of soft glass within specific temperature ranges, ensuring effective sealing.
- Corrosion Resistance: Exhibits excellent corrosion resistance, making it suitable for long-term use in various environments.
- High-Temperature Suitability: Capable of stable operation at higher temperatures, meeting the demands of electrical components.
Applications
- Electrical Vacuum Equipment: Used for sealing electrical components with soft glass.
- Electronics Industry: Applied in high-precision sealing and electronic components.
- Industrial Applications: Widely used in environments requiring high-temperature, high-stability sealing.
| C | P | S | Mn | Si | Ni | N | Cr | Fe |
| Not more than(≤) | ||||||||
| 0.12 | 0.02 | 0.02 | 1 | 0.7 | 0.5 | 0.2 | 27.0-29.0 | Balance |
| Heat Treatment Procedure | Average Linear Expansion Coefficient (ā)/（10-6/℃） |
| Heat to 1100°C ± 20°C and hold for 15 minutes, then allow to cool to room temperature by air cooling. | 20-530℃ |
| 10.8-11.4 |
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