Our Kovar 4J29 Alloy Tube is a top-notch choice for vacuum sealing in electronic components. With 29% nickel, 17% cobalt, and 54% iron, it delivers a CTE of ~5.0 ppm/°C (20-400°C), perfectly matching glass for airtight seals. It’s tough, corrosion-resistant, and built to handle the demands of precision electronics. Whether you’re working on vacuum tubes or aerospace sensors, our 4J29 tube ensures your seals stay solid and dependable.
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The electronics industry is booming, with a projected CAGR of 6.0% through 2032, driven by 5G, IoT, and aerospace advancements. Vacuum sealing is critical for components like microwave tubes and sensors, where even slight thermal expansion can cause failures. As devices get smaller and more complex, materials like our 4J29 tube are in high demand for their reliability in harsh environments. We’re positioned to meet these trends, delivering alloys that power the next wave of electronic 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 Kovar 4J29 Alloy Tube shines in electronic applications. It’s used in vacuum tubes for reliable sealing in high-performance electronics. Microwave components, like waveguides and filters, depend on its stability for telecommunications. Aerospace sensors and connectors rely on it for airtight performance in extreme conditions. Medical devices, such as diagnostic equipment, also benefit from its durable seals. Wherever vacuum sealing is critical, our 4J29 tube delivers top-tier results.
Comparison Table: Kovar 4J29 vs. Alloy 42 (4J42) vs. 4J49 Fe-Ni-Cr
Parameter | Kovar 4J29 | Alloy 42 (4J42) | 4J49 Fe-Ni-Cr |
|---|---|---|---|
Composition | 29% Ni, 17% Co, 54% Fe | 42% Ni, 58% Fe | 42% Ni, 5% Cr, 53% Fe |
CTE (ppm/°C, 20-400°C) | ~5.0 | ~4.0–4.7 (20-300°C) | ~5.5 |
Temperature Range | -50°C to 400°C | -40°C to 300°C | -50°C to 450°C |
Curie Temperature | ~435°C | ~370°C | ~390°C |
Yield Strength (MPa) | ~345 | ~310 | ~345 |
Tensile Strength (MPa) | ~520 | ~520 | ~550 |
Density (g/cm³) | 8.36 | 8.12 | 8.20 |
Applications | Vacuum tubes, microwave components | Semiconductor lead frames, seals | Semiconductor packaging, vacuum tubes |
Oxidation Resistance | Excellent | Good | Excellent |
We know the market offers plenty of sealing alloys, but our Kovar 4J29 Alloy Tube stands out for its precision and quality. Our strict quality control ensures a consistent CTE and robust mechanical properties (yield strength ~345 MPa, tensile strength ~520 MPa). We provide customized tube sizes and forms to fit your exact specs, with faster delivery than many alternatives. Our efficient production process keeps costs low without sacrificing performance, and our alloy’s excellent CTE matching gives it an edge in vacuum sealing applications. With years of expertise, we’re your trusted partner for high-performance alloy solutions.
Why Choose Our Kovar 4J29 Alloy Tube?
Our Kovar 4J29 Alloy Tube is built for reliable vacuum sealing in electronic components. Its precise thermal expansion, durability, and corrosion resistance make it perfect for vacuum tubes, aerospace sensors, and more. Whether you’re pushing the limits of 5G or building critical medical devices, our tube ensures your components stay sealed and reliable. Contact us today to see how 4J29 can power your next project!
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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 Kovar 4J29 Alloy Tube?
It’s a nickel-iron-cobalt alloy tube designed for reliable vacuum sealing, perfect for electronic components needing airtight performance.What are the key properties of Kovar 4J29?
It offers a CTE of ~5.0 ppm/°C (20-400°C), excellent corrosion resistance, and high mechanical strength, ideal for hermetic seals.What industries use Kovar 4J29 Alloy Tube?
Electronics, aerospace, telecommunications, and medical device industries rely on it for stable sealing applications.What are common applications for Kovar 4J29?
It’s used in vacuum tubes, microwave components, aerospace sensors, and electronic connectors requiring precise seals.How does Kovar 4J29 compare to other sealing alloys?
Its Ni-Co-Fe composition ensures a near-perfect CTE match with glass, providing superior seal reliability compared to many alloys.What temperature range is Kovar 4J29 effective in?
It performs reliably from -50°C to 400°C, maintaining seal integrity in vacuum and thermal environments.Is Kovar 4J29 weldable or machinable?
Yes, it’s weldable and machinable with standard techniques, though careful handling is needed due to its hardness.How does Kovar 4J29 align with industry trends?
It supports the demand for high-reliability sealing in vacuum systems, driven by 5G, IoT, and aerospace advancements.
