Our Kovar 4J29 Alloy Bar is a top choice for vacuum-sealed electronic component manufacturing. 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 crafting vacuum tubes or aerospace sensors, our 4J29 bar ensures your seals stay solid and reliable.
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The electronics industry is thriving, with a projected CAGR of 6.1% through 2032, fueled by advancements in 5G, IoT, and aerospace technologies. Vacuum sealing is critical for components like microwave tubes and sensors, where even slight thermal expansion can lead to failures. As devices become smaller and more complex, materials like our 4J29 bar are in high demand for their ability to maintain seal integrity in harsh environments. We’re ready to meet these trends, delivering alloys that power the future of electronics.
| 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 Bar is a star performer in electronic applications. It’s used in vacuum tubes for high-performance electronics, ensuring airtight seals. Microwave components, like waveguides and filters, rely on its stability for telecommunications. Aerospace sensors and connectors depend on it for reliable performance in extreme conditions. Medical devices, such as diagnostic equipment, also benefit from its durable seals. Wherever vacuum sealing is critical, our 4J29 bar delivers outstanding 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 Bar 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 bar 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 Bar?
Our Kovar 4J29 Alloy Bar 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 boundaries of 5G or building critical medical devices, our bar ensures your components stay sealed and dependable. Contact us today to see how 4J29 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 Kovar 4J29 Alloy Bar?
It’s a nickel-iron-cobalt alloy bar designed for vacuum sealing, perfect for manufacturing electronic components needing airtight reliability. -
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 Bar?
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.
