Our 4J33 Ni-Co Alloy Bar is a top-notch choice for glass-to-metal sealing in electronics. With 35% nickel, 17% cobalt, and 48% iron, it delivers a CTE of ~4.7 ppm/°C (20-450°C), perfectly matching glass for airtight seals. It’s tough, corrosion-resistant, and built to handle the demands of precision components. Whether you’re working on vacuum tubes or medical sensors, our 4J33 bar ensures your seals stay rock-solid and reliable.
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The electronics industry is booming, with a projected CAGR of 6.0% through 2032, driven by 5G, IoT, and medical device advancements. Glass-to-metal seals are critical for hermetic packaging in semiconductors, microwave components, and sensors, where thermal stability is non-negotiable. As devices get smaller and performance demands rise, materials like our 4J33 bar are in high demand for their precision and reliability. We’re positioned to meet these trends, delivering alloys that power the next generation 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 4J33 Ni-Co Alloy Bar excels in high-precision electronics. It’s used in vacuum tubes and semiconductor packaging, ensuring airtight seals for sensitive components. Microwave components, like waveguides and filters, rely on its stability for telecommunications. Medical devices, such as implantable sensors, benefit from its durable, biocompatible seals. Aerospace electronics also use it for connectors and sensors in extreme environments. Wherever precision sealing is critical, our 4J33 bar delivers outstanding performance.
Comparison Table: 4J33 Ni-Co vs. Kovar 4J29 vs. 4J49 Fe-Ni-Cr
Parameter | 4J33 Ni-Co | Kovar 4J29 | 4J49 Fe-Ni-Cr |
|---|---|---|---|
Composition | 35% Ni, 17% Co, 48% Fe | 29% Ni, 17% Co, 54% Fe | 42% Ni, 5% Cr, 53% Fe |
CTE (ppm/°C, 20-450°C) | ~4.7 | ~5.0 | ~5.5 |
Temperature Range | -40°C to 450°C | -50°C to 400°C | -50°C to 450°C |
Curie Temperature | ~430°C | ~435°C | ~390°C |
Yield Strength (MPa) | ~340 | ~345 | ~345 |
Tensile Strength (MPa) | ~520 | ~520 | ~550 |
Density (g/cm³) | 8.27 | 8.36 | 8.20 |
Applications | Semiconductor packaging, vacuum tubes | Vacuum tubes, microwave components | Semiconductor packaging, vacuum tubes |
Oxidation Resistance | Excellent | Excellent | Excellent |
We know the market offers plenty of alloy options, but our 4J33 Ni-Co Alloy Bar stands out for its quality and precision. Our strict quality control guarantees a consistent CTE and robust mechanical properties (yield strength ~340 MPa, tensile strength ~520 MPa). We provide customized bar sizes and forms to meet your exact specs, with faster delivery than many alternatives. Our efficient production process keeps costs low without sacrificing quality, and our alloy’s superior CTE matching gives it an edge in electronic applications. With years of expertise, we’re your trusted partner for high-performance alloy solutions.
Why Choose Our 4J33 Ni-Co Alloy Bar?
Our 4J33 Ni-Co Alloy Bar is built for reliable glass-to-metal sealing in electronics. Its precise thermal expansion, durability, and corrosion resistance make it perfect for vacuum tubes, medical sensors, and more. Whether you’re pushing the boundaries of 5G or building life-saving devices, our bar ensures your components stay sealed and dependable. Contact us today to see how 4J33 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 4J33 Ni-Co Alloy Bar?
It’s a nickel-cobalt-iron alloy bar designed for reliable glass-to-metal sealing, perfect for electronics needing airtight performance.What are the key properties of 4J33?
It offers a CTE of ~4.7 ppm/°C (20-450°C), excellent corrosion resistance, and high mechanical strength, ideal for hermetic seals.What industries use 4J33 Alloy Bar?
Electronics, telecommunications, aerospace, and medical device industries rely on it for stable sealing applications.What are common applications for 4J33?
It’s used in vacuum tubes, semiconductor packaging, microwave components, and medical sensors requiring precise seals.How does 4J33 compare to other sealing alloys?
Its Ni-Co-Fe composition ensures a close CTE match with glass, providing superior seal integrity compared to many alloys.What temperature range is 4J33 effective in?
It performs reliably from -40°C to 450°C, maintaining seal integrity in demanding electronic environments.Is 4J33 weldable or machinable?
Yes, it’s weldable and machinable with standard techniques, though precise control is needed to avoid work hardening.How does 4J33 align with industry trends?
It supports the need for miniaturized, high-reliability components in 5G, IoT, and medical electronics, driven by technological advancements.
