Technical Whitepaper: Kovar® (UNS K94610 / ASTM F15) — The Precision Sealant for Hermetic Sealing

Date: 2026年8月25日 Categories: News Views: 283

Kovar® (UNS K94610 / ASTM F15) is a vacuum-melted, iron-nickel-cobalt, low-expansion alloy whose chemical composition is controlled within narrow limits to assure uniform thermal expansion properties.

Shanghai Hangbo Alloy Group provides high-precision Kovar alloy that strictly adheres to ASTM F15 standards for aerospace and electronic applications.

Technical Data (ASTM F15)

  • Nominal Composition: Ni 29%, Co 17%, Fe Balance.
  • Mechanical Properties (Annealed):
    • Tensile Strength: ~520 MPa (75 ksi)
    • Yield Strength: ~345 MPa (50 ksi)
    • Elongation: 30%
  • Key Feature: Coefficient of Thermal Expansion (CTE) matched to borosilicate glasses and alumina ceramics.

Why Kovar is Critical for Aerospace Electronics

Kovar is the only reliable choice for hermetic seals in aerospace electronics because its CTE curve exactly mimics glass from -80°C to 450°C, preventing seal failure during atmospheric re-entry.

Applications

  • Hermetic seals for power tubes and microwave tubes.
  • Integrated circuit lead frames.
  • Transistor headers and glass-to-metal seals.
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