Kovar (4J29) Package Shell
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Kovar (4J29) Package Shell
Short Description:
Kovar alloy 4J29 (Fe-53%, Ni-29%, Co-17%) achieves a thermal expansion coefficient of 4.6×10⁻⁶/℃ through the synergistic effect of iron, nickel and cobalt, which perfectly matches glass/ceramics and can be stress-free sealed in the temperature range of -65℃ to 200℃. Iron provides strength and toughness, nickel reduces the thermal expansion coefficient, and cobalt optimizes high-temperature stability, jointly ensuring the reliability of structural sealing in extreme environments. Its tensile strength reaches 500-700MPa, and it has good ductility. It supports precision stamping of 0.1-3mm plates (tolerance ±0.05mm), and adapts to the processing needs of complex electronic components and mechanical parts.
Kovar (4J29) Package Shell
The core manufacturing technologies include: glass sealing in a hydrogen environment of 800-900℃, forming an airtight interface through atomic-level metallurgical bonding; six-sided electroplating process covers a ≥2μm gold plating layer to enhance surface protection. This alloy is widely used in aerospace (traveling wave tubes, inertial navigation sensors) and military fields (missile guidance systems, radars), providing packaging protection for high-precision equipment in extreme environments and ensuring stable operation under complex battlefield conditions.
