Kovar® Plate

Alternative and trade names
Pernifer 2918®, Dilvar P1®, NILO K®
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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

Show chart

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

Fe

-

Balance

Ni

29 %

Co

17 %

Cr

0.2 %

Si

0.2 %

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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.

All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
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.