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

Window