Kovar® Plate
Pernifer 2918®, Dilvar P1®, NILO K®
Description
Kovar is a controlled expansion alloy. It is a nickel iron alloy with 29% nickel, 17% cobalt and the remaining balance is iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular of the controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product.
Related Standards
Equivalent Materials
Properties
General
Density ρ
8.36 g/cm³ at 20 °C
Dimension
Dimensions
Available thicknesses: 4.8mm, 6.4mm, 7.1mm, 7.9mm, 9.5mm, 11.1mm, 12.7mm, 15.9mm, 19.1mm, 25.4mm, 31.8mm
Length l
1829 mm
Thickness t
4.8 - 31.8 mm
Width w
381 mm
Mechanical
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
Thermal
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
Electrical
Electrical resistivity ρel
4E-7 Ω·m at 20 °C
Magnetic
Curie temperature Tc
435 °C
Chemical properties
Element
Weight %
Comment
-
Balance
29 %
17 %
0.2 %
0.2 %
Technological properties
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, hybrid packages
This material data has been provided by Ed Fagan.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.
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