Kovar Alloy, Glass Sealed and Controlled Expansion Alloys

Kovar Alloy, Glass sealed and controlled expansion alloys
Kovar alloy, ASTM F15, Nilo-K, UNS K94610(FeNi29Co17), Chinese 4J29.
Specifications: ASTM F15, DIN 17745, S.E.W.385, Werkstoff Nr.1.3981.
AFOR NF A54-301

Detailed Description
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.
4.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.

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.

1.Alloy grades and chemical composition consistent with the provisions of table 1

2.The tensile strength of wire in line with the provisions of Table 2

3.Strip tensile strength in line with the provisions of Table 3

4.Alloy average linear expansion coefficient in line with the Table 4        

 5.Alloy typical expansion coefficient    

Specification: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube