Kovar / UNS K94610 ASTM F15 Iron-Nickel-Cobalt Sealing Alloy Round
1. Grade: Kovar
2. Process: VIR - VAR - ESR - Forging - Semifinished - Finished
3. Delivery Condition: Forged, Solution Annealed, Aged
4. Surface Condition: Black, Machining
5. OD: 6-300mm
6. Specification: ASTM, ASME, GB, JIS, GOST, DIN, etc.
7. Packing: Plywood case, Bundle
Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose
chemical composition is controlled within narrow limits to assure
precise uniform thermal expansion properties. Extensive quality
controls are employed in the manufacture of this alloy to ensure
uniform physical and mechanical properties for ease in deep
drawing, stamping and machining.
1.Kovar has a wide usage in the electronics industry, such as metal
parts bonded to hard glass envelopes. These parts are used for such
devices as power tubes and X-ray tubes, etc.
2.In the semiconductor industry kovar is used in hermetically
sealed packages for both integrated and discrete circuit devices.
3.Kovar is provided in a variety of forms to facilitate efficient
manufacturing of various metal parts. It has thermal expansion
characteristics matching those of hard glass. Used for matched
expansion joints between metals and glass or ceramics.
Kovar alloy is magnetic at all temperatures below the Curie point.
Magnetic properties will depend upon heat treatment; the lower the
hardness, the higher the permeability values and lower hysteresis
loss. Examples of permeability properties are shown in the
30 min. - FC
20 min. - FC
1. Kovar alloy has been used for making hermetic seals with the
harder Pyrex glasses and ceramic materials.
2.This alloy has found wide application in power tubes, microwave
tubes, transistors and diodes. In intergrated circuits, it has been
used for the flat pack and the dual-in-line package.