Carpenter Kovar® Alloy (Glass and Ceramic Sealing Alloy)

Category	Metal , Electronic/Magnetic Alloy , Ferrous Metal , Superalloy
Manufacturer	Carpenter Technology Corporation (Cartech)
Trade Name	Kovar®
Port	Ningbo port,China
Trade Terms	FOB, CFR, CIF
Payment Terms	L/C, T/T, Western Union
Download PDF	Carpenter Kovar® Alloy (Glass and Ceramic Sealing Alloy).pdf
Price	EMAIL US sales@lookpolymers.com
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Material Notes:

Data provided by Carpenter Technology Corporation.Kovar® alloy is a vacuum melted, Fe-Ni-Co, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties.Kovar alloy 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.Kovar® is a registered trademark of Carpenter Technology Corporation.

Physical Properties	Metric	English	Comments
Density	8.36 g/cc	0.302 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	120	120
Hardness, Rockwell B	68	68
Tensile Strength, Ultimate	517 MPa	75000 psi
Tensile Strength, Yield	345 MPa	50000 psi
Elongation at Break	30 %	30 %	in 50.8 mm
Modulus of Elasticity	138 GPa	20000 ksi
Poissons Ratio	0.317	0.317
Shear Modulus	51.7 GPa	7500 ksi

Thermal Properties	Metric	English	Comments
CTE, linear	4.90 µm/m-°C @Temperature 30.0 - 400 °C	2.72 µin/in-°F @Temperature 86.0 - 752 °F
	5.13 µm/m-°C @Temperature 25.0 - 300 °C	2.85 µin/in-°F @Temperature 77.0 - 572 °F
	5.30 µm/m-°C @Temperature 30.0 - 450 °C	2.94 µin/in-°F @Temperature 86.0 - 842 °F
	5.86 µm/m-°C @Temperature 25.0 - 100 °C	3.26 µin/in-°F @Temperature 77.0 - 212 °F
	6.15 µm/m-°C @Temperature 25.0 - 500 °C	3.42 µin/in-°F @Temperature 77.0 - 932 °F
	11.26 µm/m-°C @Temperature 25.0 - 900 °C	6.256 µin/in-°F @Temperature 77.0 - 1650 °F
Specific Heat Capacity	0.439 J/g-°C @Temperature 0.000 °C	0.105 BTU/lb-°F @Temperature 32.0 °F
	0.649 J/g-°C @Temperature 430 °C	0.155 BTU/lb-°F @Temperature 806 °F
Thermal Conductivity	17.3 W/m-K	120 BTU-in/hr-ft²-°F
Melting Point	1450 °C	2640 °F
Solidus	1450 °C	2640 °F	Melting Point
Liquidus	1450 °C	2640 °F	Melting Point

Component Elements Properties	Metric	English	Comments
Carbon, C	<= 0.020 %	<= 0.020 %
Cobalt, Co	17 %	17 %
Iron, Fe	53 %	53 %	as remainder
Manganese, Mn	0.30 %	0.30 %
Nickel, Ni	29 %	29 %
Silicon, Si	0.20 %	0.20 %

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000490 ohm-cm	0.0000490 ohm-cm
Curie Temperature	435 °C	815 °F

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