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Kovar is a controlled expansion alloy. It is a nickel iron alloy with 29% nickel, 17% cobalt and the remaining balance is iron.
Length l
1829 mm
Thickness t
4.8 - 31.8 mm
Width w
381 mm
Electrical resistivity ρel
4E-7 Ω·m at 20 °C
Density ρ
8.36 g/cm³ at 20 °C
Curie temperature Tc
435 °C at 20 °C
Dimension
Available thicknesses: 4.8mm, 6.4mm, 7.1mm, 7.9mm, 9.5mm, 11.1mm, 12.7mm, 15.9mm, 19.1mm, 25.4mm, 31.8mm
Elastic modulus E
207 GPa at 20 °C
Elongation A
30 % at 20 °C
in 2 in.
Hardness, Rockwell B HRB
80 [-] at 20 °C
Tensile strength Rm
518 MPa at 20 °C
Yield strength YS
276 MPa at 20 °C
Coefficient of thermal expansion α
5.8E-6 1/K at 100 °C
Melting point Tm
1449 °C
Specific heat capacity cp
460 J/(kg·K) at 20 °C
Thermal conductivity λ
17 W/(m·K) at 20 °C
Element
Weight %
Comment
-
balance
29 %
17 %
0.2 %
0.2 %
Application areas
Common applications of Kovar: Glass-to-metal hermetic sealing with hard borosilicate glass, ceramic-to-metal sealing, power tubes, microwave tubes, transistors, diodes, integrated circuits
This material data has been provided by Ed Fagan.