Our Kovar 4J29 alloy plate is your go-to solution for reliable vacuum sealing in electronic systems. Made with a precise blend of 29% nickel, 17% cobalt, and 54% iron, this alloy—widely known as Kovar—has a thermal expansion coefficient that perfectly matches borosilicate glass and certain ceramics. This makes it ideal for creating airtight seals in vacuum tubes, hybrid circuits, and other precision components. Stable from -80°C to 450°C, our Kovar 4J29 offers excellent corrosion resistance, weldability, and machinability, ensuring top performance in even the toughest environments.
The electronics industry is on fire, with global demand for precision alloys like Kovar 4J29 growing at a CAGR of 6.5% through 2030. This surge is driven by advancements in 5G, aerospace electronics, and medical devices, where vacuum sealing is critical for performance and reliability. As devices get smaller and more complex, the need for materials that can handle thermal stress and maintain hermetic seals is skyrocketing. Kovar 4J29 is a standout choice, meeting the industry’s push for compact, durable, and high-performance components in everything from satellites to medical implants.
| 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 plate is a versatile workhorse across multiple industries:
Electronics: Creates hermetic seals in vacuum tubes, microwave tubes, and semiconductor packages.
Aerospace: Ensures reliable seals in avionics and satellite components exposed to extreme conditions.
Medical Devices: Supports precision sealing in implants and diagnostic equipment.
Telecommunications: Enhances performance in optical systems and microwave devices.
Scientific Instruments: Powers X-ray tubes and particle accelerators with stable vacuum seals.
Its ability to maintain tight seals under thermal and environmental stress makes it a must-have for precision applications.
Comparison Table: Kovar 4J29 Alloy Plate vs. Other Sealing Alloys
Parameter | Kovar 4J29 Alloy Plate | Other Sealing Alloys |
|---|---|---|
Thermal Expansion (CTE) | Matches borosilicate glass (~5.1 × 10⁻⁶ /K) | Varies, often less compatible |
Temperature Range | -80°C to 450°C | Typically limited to 200–400°C |
Corrosion Resistance | Excellent, resists harsh vacuum conditions | Moderate, varies by alloy |
Weldability | High, supports strong hermetic seals | Inconsistent, some alloys less reliable |
Machinability | Superior, enables precise fabrication | Moderate, may require specialized tools |
Applications | Electronics, aerospace, medical devices | Limited to specific, less critical uses |
Durability | Exceptional, resists thermal stress | Varies, may degrade under extremes |
Customization | Highly customizable (size, form, thickness) | Limited flexibility in customization |
Our Kovar 4J29 alloy plate rises above the rest for several reasons:
Precision Manufacturing: We meet ASTM F15 standards, ensuring consistent composition, strength, and thermal expansion properties.
Custom Solutions: Available in tailored sizes, thicknesses (0.3–10mm), and forms to fit your exact specifications.
Top Quality: Rigorous testing for surface finish, grain size, and inclusions guarantees flawless performance.
Fast Delivery: Flexible MOQs starting at 100kg and in-stock options for quick turnaround.
Expert Support: Our R&D team offers technical guidance to optimize your sealing applications.
Compared to other options, our Kovar 4J29 combines unmatched reliability, customization, and cost-effectiveness, making it the ideal choice for 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 plate used for?
It’s used for reliable vacuum sealing in electronic systems, ensuring airtight seals in devices like vacuum tubes and hybrid circuits.Why is Kovar 4J29 ideal for vacuum sealing?
Its thermal expansion coefficient matches borosilicate glass and ceramics, preventing cracks during thermal cycling.Which industries use Kovar 4J29 alloy plates?
Electronics, aerospace, telecommunications, medical, and scientific instrument industries depend on it for precision sealing.How does Kovar 4J29 perform in extreme conditions?
It stays stable from -80°C to 450°C, perfect for demanding vacuum environments.What are the key properties of Kovar 4J29?
Low thermal expansion, high corrosion resistance, excellent weldability, and machinability for precision applications.Can Kovar 4J29 be customized for specific projects?
Yes, we offer custom thicknesses, widths, and forms (plate, sheet, strip) to meet your needs.What standards does Kovar 4J29 meet?
It complies with ASTM F15 and other industry standards for composition, strength, and thermal properties.How does Kovar 4J29 improve device reliability?
Its robust sealing and thermal stability ensure long-term performance in critical electronic systems.
