Kovar it was invented to meet the need for a reliable glass-to-metal seal, which is required in electronic devices such as light bulbs, vacuum tubes, cathode ray tubes, and in vacuum systems in chemistry and other scientific research. Most metals cannot seal to glass because their coefficient of thermal expansion is not the same as glass, so as the joint cools after fabrication the stresses due to the differential expansion rates of the glass and metal cause the joint to crack.

Chemical composition

Typical Physical properties

Application overview and special requirements

The kovar alloy is a typical fe-ni Co glass sealing alloy for international use.Long used by the aviation factory, the performance is stable.Mainly used in electric vacuum components such as tube, shock tube, ignitron, magnetron, transistors, the wires of a sealing plug, relays, integrated circuits, chassis, such as shell, support glass sealing.In the application, the selected glass should match the expansion coefficient of the alloy.The stability of the cryogenic tissue is strictly tested by using temperature.Proper heat treatment should be done during the process to ensure that the material has good deep drawing performance.

Tensile Strength, MPa

The heat treatment process

Coefficient of expansion

Thermal conductivity

Style of supply