Our 4J43 Fe-Ni-Co Alloy Bar is a top-notch choice for advanced glass-to-metal sealing in aerospace technology. With 42% nickel, 15% cobalt, and 43% iron, it delivers a CTE of ~5.2 ppm/°C (20-500°C), perfectly matching glass for airtight seals. It’s tough, corrosion-resistant, and built to handle the extreme conditions of aerospace applications. Whether you’re crafting satellite components or precision sensors, our 4J43 bar ensures your seals stay rock-solid and reliable.
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The aerospace industry is soaring, with a projected CAGR of 5.9% through 2032, driven by satellite technology, space exploration, and advanced electronics. Glass-to-metal seals are critical for components like sensors and connectors, where thermal stability is a must in harsh environments. As aerospace systems demand smaller, more reliable parts, materials like our 4J43 bar are in high demand for their precision and durability. We’re positioned to meet these trends, delivering alloys that power the next generation of aerospace innovation.
| Elements | 4J29 | 4J36 | |
| Carbon (C) | Not greater than | 0.03 | 0.05 |
| Sulfur (S) | 0.02 | 0.02 | |
| Phosphorus (P) | 0.02 | 0.02 | |
| Manganese (Mn) | ≤0.50 | 0.20-0.60 | |
| Silicon (Si) | ≤0.30 | ≤0.30 | |
| Nickel (Ni) | 28.5-29.5 | 35.0-37.0 | |
| Chromium (Cr) | - | - | |
| Cobalt (Co) | 16.8-17.8 | - | |
| Iron (Fe) | Rest | Rest | |
| Other Elements |
| Alloy Grade | 20°C-100°C | 20°C-300°C | 20°C-500°C |
| 4J36 Invar Alloy | 1.2×10⁻⁶ /°C | 2.5×10⁻⁶ /°C | - |
| 4J29 Kovar Alloy | 4.6×10⁻⁶ /°C | 5.5×10⁻⁶ /°C | 6.2×10⁻⁶ /°C |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Density (g/cm³) | 8.1 | 8.2 |
| Tensile Strength (MPa) | 500-600 | 600-700 |
| Yield Strength (MPa) | 250-350 | 300-400 |
| Hardness (HV) | 150-200 | 200-250 |
| Alloy Grade | 4J36 Invar Alloy | 4J29 Kovar Alloy |
| Electrical Resistivity (10⁻⁶ Ω·cm) | 80 | 50 |
| Thermal Conductivity (W/m·K) | 10-12 | 16-18 |
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Our 4J43 Fe-Ni-Co Alloy Bar is a standout in aerospace applications. It’s used in satellite sensors and components, ensuring airtight seals in extreme space conditions. Vacuum tubes and precision connectors in aerospace electronics rely on its stability for reliable performance. It’s also perfect for scientific instruments, like those in space telescopes, where thermal distortion is not an option. Beyond aerospace, it supports electronics and telecommunications with durable seals for high-performance devices. Wherever precision sealing is critical, our 4J43 bar delivers.
Comparison Table: 4J43 Fe-Ni-Co vs. 4J33 Ni-Co vs. Kovar 4J29
Parameter | 4J43 Fe-Ni-Co | 4J33 Ni-Co | Kovar 4J29 |
|---|---|---|---|
Composition | 42% Ni, 15% Co, 43% Fe | 35% Ni, 17% Co, 48% Fe | 29% Ni, 17% Co, 54% Fe |
CTE (ppm/°C, 20-500°C) | ~5.2 | ~4.7 | ~5.0 |
Temperature Range | -50°C to 500°C | -40°C to 450°C | -50°C to 400°C |
Curie Temperature | ~420°C | ~430°C | ~435°C |
Yield Strength (MPa) | ~360 | ~340 | ~345 |
Tensile Strength (MPa) | ~560 | ~520 | ~520 |
Density (g/cm³) | 8.25 | 8.27 | 8.36 |
Applications | Aerospace sensors, satellite parts | Semiconductor packaging, vacuum tubes | Vacuum tubes, microwave components |
Oxidation Resistance | Excellent | Excellent | Excellent |
We know the market offers plenty of alloy options, but our 4J43 Fe-Ni-Co Alloy Bar stands out for its quality and performance. Our strict quality control ensures a consistent CTE and robust mechanical properties (yield strength ~360 MPa, tensile strength ~560 MPa). We provide customized bar sizes and forms to fit your exact specs, with faster delivery than many alternatives. Our efficient production process keeps costs low without sacrificing quality, and our alloy’s excellent CTE matching and oxidation resistance give it an edge in aerospace applications. With years of expertise, we’re your trusted partner for high-performance alloy solutions.
Why Choose Our 4J43 Fe-Ni-Co Alloy Bar?
Our 4J43 Fe-Ni-Co Alloy Bar is built for advanced glass sealing in aerospace technology. Its precise thermal expansion, durability, and corrosion resistance make it ideal for satellite components, sensors, and connectors. Whether you’re pushing the boundaries of space exploration or building high-performance electronics, our bar ensures your seals stay reliable. Contact us today to see how 4J43 can power your next project!
For more details, pls directly contact us.
About Us:
Our 12,000㎡ factory is equipped with complete capabilities for research, production, testing, and packaging. We strictly adhere to ISO 9001 standards in our production processes, with an annual output of 1,200 tons. This ensures that we meet both quantity and quality demands. Furthermore, all products undergo rigorous simulated environment testing including high temperature, high pressure, and corrosion tests before being dispatched, ensuring they meet customer specifications. For all our clients, we offer timely and multilingual after-sales support and technical consulting, helping you resolve any issues swiftly and efficiently.
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FAQs
What is 4J43 Fe-Ni-Co Alloy Bar?
It’s a nickel-iron-cobalt alloy bar designed for advanced glass-to-metal sealing, ideal for aerospace technology needing airtight reliability.What are the key properties of 4J43?
It offers a CTE of ~5.2 ppm/°C (20-500°C), excellent corrosion resistance, and high mechanical strength, perfect for hermetic seals.What industries use 4J43 Alloy Bar?
Aerospace, electronics, telecommunications, and scientific instrumentation rely on it for robust sealing solutions.What are common applications for 4J43?
It’s used in aerospace sensors, satellite components, vacuum tubes, and precision connectors requiring stable seals.How does 4J43 compare to other sealing alloys?
Its Ni-Co-Fe composition ensures a precise CTE match with glass, providing superior seal durability compared to many alloys.What temperature range is 4J43 effective in?
It performs reliably from -50°C to 500°C, maintaining seal integrity in extreme aerospace environments.Is 4J43 weldable or machinable?
Yes, it’s weldable and machinable with standard techniques, though careful control is needed to avoid work hardening.How does 4J43 align with industry trends?
It supports the demand for high-reliability sealing in aerospace and electronics, driven by satellite technology and miniaturization.
