4J32 Rod Controlled Expansion Alloy Bar Fe Ni Alloy for Glass and Ceramic Sealing
Product Description
4J32 alloy rod is a Fe-Ni controlled expansion alloy, specially designed for glass-to-metal and ceramic-to-metal sealing applications. Its thermal expansion coefficient closely matches that of certain hard glasses and ceramics, ensuring excellent hermeticity and reliability.
This alloy offers good machinability, stable thermal expansion performance, and reliable mechanical properties, making it widely used in semiconductor packaging, vacuum devices, relays, sensors, aerospace instruments, and electronic components.
Key Features
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Fe-Ni controlled expansion alloy
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Excellent thermal expansion match with ceramics & hard glass
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Superior hermetic sealing capability
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Stable mechanical strength across working temperature range
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Good machinability and polishability
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Supplied in rods, wires, sheets, customized forms
Typical Applications
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Glass-to-metal sealing
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Ceramic-to-metal sealing
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Semiconductor packaging bases
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Relays, sensors, electronic tubes
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Aerospace and defense components
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Vacuum electronic devices
Chemical Composition (%)
| Element | Content |
|---|---|
| Fe | Balance |
| Ni | ~32% |
| Mn, Si, C, etc. | Minor |
Physical and Performance Properties
| Property | Typical Value |
|---|---|
| Density | ~8.1 g/cm³ |
| Thermal Expansion (20–400°C) | ~4.5 ×10⁻⁶/°C |
| Tensile Strength | ≥ 450 MPa |
| Hardness | ~HB 130–160 |
| Working Temp | -196°C to 450°C |
| Standard | GB/T, ASTM, IEC |
Available Specifications
| Item | Range |
|---|---|
| Diameter | 3 mm – 200 mm |
| Length | ≤ 6000 mm |
| Tolerance | As per ASTM / GB standard |
| Surface | Bright / Polished / Black |
| Packaging | Wooden case, steel strip bundling |
| Certification | ISO 9001, SGS, RoHS |
| Origin | China (OEM/ODM service available) |
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