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Material Properties and Filler Comparison for Kovar Glass Sealing Applications

Explore the thermal expansion properties of copper and molybdenum used with Kovar alloy (Code 7070) for glass sealing, comparing filler materials like Sn-Ag solder and Georo Au-Ge braze. Learn about shear and tensile strengths, Young's modulus, and liquidus temperatures.

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Material Properties and Filler Comparison for Kovar Glass Sealing Applications

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  1. Kovar (shown in Blue)

  2. Properties of Copper

  3. Thermal Expansion of Copper

  4. Thermal expansion of Molybdenum TE=4.535 x 10-6 per deg C at 400 C

  5. Glass used with Kovar Code 7070

  6. Comparison of Filler Materials • Sn – Ag Solder • Shear Strength= 2,700 psi • Tensile Strength= 5,800 psi • Expansion 30 PPM/oC • Liquidus 430 oF • Georo Au - Ge Braze • Shear Strength= 26,825 psi • Tensile Strength= 26,835 psi • Young’s Modulus =10.55 x 106 psi • Expansion 13 PPM/oC • Liquidus 673 oF • Sn – Cu - Ag Solder • Shear Strength= 5,874 psi • Liquidus 423oF

  7. Wesco Metals

  8. Window

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