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Kovar (shown in Blue)
Properties of Copper
Thermal Expansion of Copper
Thermal expansion of MolybdenumTE=4.535 x 10-6 per deg C at 400 C
Glass used with KovarCode 7070
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 423 oF
Wesco Metals
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