Kovar

Basics

• A Nickel Cobalt allow (Ferrous Alloy ?) that has the same thermal expansion as Glass allowing it to make a strong Glass-Metal Seal for things such as Gas Discharge Lamps , Light Bulbs , X-Ray Tubes , Cathode Ray Tubes , and Vacuum Tubes

External Links

• The Wikipedia Page on Kovar
• A Search in the Materials Science Section of Science Direct for Kovar
• The Magellan Metals Product Page on Kovar (trademarked name i guess)
• The "High Temp Metals" Product Page on Kovar