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Kovar Material Precision Metal Bright Kovar Wire For Multipin Headers Seals

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Brand Name :	OHMALLOY
Model Number :	Ohmalloy-Kovar
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Kovar Material Precision Metal Bright Kovar Wire For Multipin Headers Seals

Kovar(4J29) Alloy Material Wire

Kovar/4J29/UNS K94610/W.Nr.1.3912

General Description

Kovar is a nominal 29%Ni-17%Co-54%Fe alloy that is a well-known glass-sealing alloy suitable for sealing to hard glasses. Kovar has a nominal expansion coefficient of approximately 5 ppm/°C and inflection temperature of ~450 °C (840 °F).

Kovar (ASTM F15) has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials. This alloy has found wide application in power tubes, microwave tubes, transistors, and diodes. In integrated circuits, it has been used for the flat pack and the dual-in-line package.

Chemical Composition

Grade	C%	P%	S%	Mn%	Si%	Cu%	Cr%	Mo%	Ni%	Co%	Fe%
Kovar	Max 0.03	Max 0.020	Max 0.020	Max 0.50	Max 0.30	Max 0.20	Max 0.20	Max 0.20	28.5-29.5	16.8-17.8	Bal.

Specifications

Grade	UNS	Werkstoff Nr.	ASTM
Kovar	K94610	1.3981	F15

Physical Properties

Grade	Density	Melting Point
Kovar	8.17 g/cm3	1449°C

Mechanical Properties

Grade	Tensile Strength N/mm²
Grade	Soft	1/4 Hard	1/2 Hard	3/4 Hard	Full Hard
Kovar Strip	<570	520-630	590-700	600-770	>700
Kovar Wire	<585	585-725	655-795	725-860	>860

Coefficient of Expansion

Alloy	Linear Coefficient of Thermal Expansion ā,10-6/℃
Alloy	20-200℃	20-300℃	20-400℃	20-450℃	20-500℃	20-600℃	20-700℃	20-800℃
Kovar	5.9	5.3	5.1	5.3	6.2	7.8	9.2	10.2

Kovar Material Precision Metal Bright Kovar Wire For Multipin Headers Seals

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