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4J28 Fe-Ni Alloy Wire for Glass-to-Metal Sealing
| Place of Origin | CHINA |
|---|---|
| Brand Name | HUONA |
| Certification | ISO9001 |
| Model Number | WIRE |
| Minimum Order Quantity | 1KG |
| Price | Bargain |
| Packaging Details | Carton or Wooden Case |
| Delivery Time | A WEEK |
| Payment Terms | T/T |
| Supply Ability | 1000kg Per Week |
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xProduct Details
| Density | 8.2 G/cm³ | Thermal Expansion Coefficient (30–300°C) | ~5.0 × 10⁻⁶ /°C |
|---|---|---|---|
| Melting Point | Approx. 1450°C | Electrical Resistivity | ~0.45 μΩ·m |
| Magnetic Permeability (μ) | High At Low Magnetic Field Intensities | Tensile Strength | ≥ 450 MPa |
| Packaging | Plastic Spools, Vacuum Bags, Anti-rust Wrapping, And Customized Labels Upon Request | Shipping Methods | Air Freight, Sea Freight, Express Delivery |
| Highlight | Soft Magnetic Low Expansion Alloy,customizable Low Expansion Alloy,Soft Magnetic invar welding wire |
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Product Description
Glass Sealing Alloy Wire 4J28 Fe-Ni Alloy Wire
Product Attributes
| Attribute | Value |
|---|---|
| Density | 8.2 g/cm³ |
| Thermal Expansion Coefficient (30–300°C) | ~5.0 × 10⁻⁶ /°C |
| Melting Point | Approx. 1450°C |
| Electrical Resistivity | ~0.45 μΩ·m |
| Magnetic Permeability (μ) | High at low magnetic field intensities |
| Tensile Strength | ≥ 450 MPa |
| Packaging | Plastic spools, vacuum bags, anti-rust wrapping, and customized labels upon request |
| Shipping Methods | Air freight, sea freight, express delivery |
Product Overview
Material: 4J28 (Fe-Ni Alloy, Kovar-type Glass-Sealing Alloy)
Specifications: Available in various diameters (0.02 mm to 3.0 mm), lengths customizable
Surface Treatment: Bright surface, oxide-free, annealed or cold-drawn
Packaging: Coil/Spool form, plastic wrapping, vacuum-sealed bag or customized packaging upon request
Specifications: Available in various diameters (0.02 mm to 3.0 mm), lengths customizable
Surface Treatment: Bright surface, oxide-free, annealed or cold-drawn
Packaging: Coil/Spool form, plastic wrapping, vacuum-sealed bag or customized packaging upon request
Detailed Description
4J28 alloy wire, also known as Fe-Ni alloy wire, is a precision soft magnetic and glass-sealing material. With a composition primarily consisting of iron and approximately 28% nickel, it provides exceptional thermal expansion matching with borosilicate glass, making it widely used in electronic packaging and glass-to-metal sealing applications.
4J28 wire exhibits excellent sealing properties, stable magnetic performance, and reliable mechanical characteristics. It is extensively used in electronic tubes, hermetic packaging, semiconductor housings, and high-reliability aerospace and military components.
Key Features
- Excellent Glass-to-Metal Sealing: Ideal thermal expansion compatibility with borosilicate glass for tight, hermetic seals
- Good Magnetic Properties: Suitable for soft magnetic applications and stable magnetic response
- High Dimensional Precision: Available in ultra-fine diameters, precision-drawn for sensitive electronic components
- Oxidation Resistance: Bright surface, oxidation-free, suitable for vacuum and high-reliability sealing
- Customizable: Dimensions, packaging, and surface conditions can be tailored to specific customer needs
Applications
- Electronic tubes and vacuum devices
- Glass-to-metal sealed relays and sensors
- Semiconductor and hermetic packages
- Aerospace and military-grade electronic components
- Optical and microwave components requiring precise thermal expansion matching
Technical Parameters
Chemical Composition:
Ni: 28.0 ± 1.0% | Co: ≤ 0.3% | Mn: ≤ 0.3% | Si: ≤ 0.3%
C: ≤ 0.03% | S, P: ≤ 0.02% each | Fe: Balance
Ni: 28.0 ± 1.0% | Co: ≤ 0.3% | Mn: ≤ 0.3% | Si: ≤ 0.3%
C: ≤ 0.03% | S, P: ≤ 0.02% each | Fe: Balance
- Density: ~8.2 g/cm³
- Thermal Expansion Coefficient (30-300°C): ~5.0 × 10⁻⁶ /°C
- Melting Point: Approx. 1450°C
- Electrical Resistivity: ~0.45 μΩ*m
- Magnetic Permeability (μ): High at low magnetic field intensities
- Tensile Strength: ≥ 450 MPa
- Elongation: ≥ 25%
Packaging & Shipping
- Packaging: Plastic spools, vacuum bags, anti-rust wrapping, and customized labels upon request
- Shipping Methods: Air freight, sea freight, express delivery
- Lead Time: 7-15 working days based on order quantity
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