KOVAR

Descriptions of KOVAR

Kovar, also known as ASTM F 15 Alloy, is a controlled expansion alloy that is typically applied to high integrity glass and ceramic to metal seals, lids, lead frames and electronic package base.

Kovar is made of nickel, cobalt and iron. This alloy is designed to adapt to computer, microwave, hydrid, semiconductor and space age technology demands, thus, making this an essential resource to the defense, aerospace and telecommunications industries.

Chemical Composition

The chemical composition of KOVAR is outlined in the following table.

Element	Content (%)
Nickel, Ni	29
Cobalt, Co	17
Silicon, Si	0.2
Chromium, Cr	0.2
Carbon, C	0.02
Iron, Fe	Remainder

Physical Properties

The physical properties of super alloy KOVAR are tabulated below.

Properties	Metric	Imperial
Density	8.3 g/cm³	0.302 lb/in³
Melting point	1449°C	2640°F

Mechanical Properties

The following table shows mechanical properties of super alloy KOVAR.

Properties	Metric	Imperial
Tensile strength	518 MPa	75 ksi
Yield strength	276 MPA	40 ksi
Elongation	30%	30%
Hardness, (HRB)	80	80

KOVAR Available Forms:

Foil, sheet, rod, plate, wire, tube, extrusions, forgings

Applications of KOVAR

KOVAR’s expansion properties are useful in Pyrex glasses as well as alumina ceramics, thus making this super alloy one of the popular controlled expansion alloys that can be adapted for hermetic sealing applications.

Super alloy KOVAR is also applied in the following:

Glass sealing of metal components or lead wires, into hard glass or ceramic devices
In applications where low expansion with temperature change is an essential characteristic e.g. integrated circuits packaging
Scientific instruments
Microwave tubes
Hybrid packages
Power tubes
Transistors
Diodes

Packaging of KOVAR

Our KOVAR is carefully handled to minimize damage during storage and transportation and to preserve the quality of the product in its original condition.