Kovar / UNS K94610 ASTM F15 Iron-Nickel-Cobalt Sealing Alloy Round Bar

 
Kovar / UNS K94610 ASTM F15 Iron-Nickel-Cobalt Sealing Alloy Round Bar
 
 
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.

Chemical Composition

Characteristics

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.

Magnetic Properties

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 following chart:

Applications

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.