Kovar (4j29) is a nickel iron alloy widely used in the field of electronic packaging due to its linear expansion coefficient similar to glass. Kovar (4j29) consists of approximately 29% nickel, 17% cobalt, and 54% iron, as well as trace elements such as silicon, aluminum, and titanium. Kovar (4j29) has the following characteristics:

Low coefficient of linear expansion: The coefficient of linear expansion of Kovar (4j29) is very close to that of glass, so it can effectively avoid thermal stress damage caused by temperature changes when manufacturing electronic packaging components. Good processability: Kovar (4j29) has good processability, and can be formed and processed by cold processing, hot working, etc.

Good welding performance: Kovar (4j29) can be welded with materials such as glass, tungsten, molybdenum, etc., making it easy to combine with other materials when manufacturing electronic packaging components. Good corrosion resistance: Kovar (4j29) has good corrosion resistance and can be used stably in various environments for a long time.

Kovar (4j29) is widely used in manufacturing electronic packages, semiconductor devices, vacuum tubes, optical instrument and other fields.