The Materials You Need When You Need Them

Kovar1 (aka ASTM F-15, Pernifer 29182, Dilvar P13 and NILO K4)

Kovar1 (aka ASTM F-15, Pernifer 29182, Dilvar P13 and NILO K4)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.

Kovar Products

Ed Fagan Inc. stocks Kovar in a variety of forms and dimensions. Below are most of the standard stock form/sizes. If you do not see the size or form of Kovar that you require, please call one of our materials experts; our sales people are very knowledgeable and can assist you. We can cut, slit, shear, or center less grind Kovar to your exact specifications, and we also have tremendous versatility when it comes to custom sizes, packages, and unusual materials.

Kovar Rod

Kovar Rod Diameter

Kovar Rod Diameter

.050” Kovar Rod

.875” Kovar Rod

.060” Kovar Rod

1.000” Kovar Rod

.0625” Kovar Rod

1.125” Kovar Rod

.090” Kovar Rod

1.250” Kovar Rod

.093” Kovar Rod

1.375” Kovar Rod

.096” Kovar Rod

1.500” Kovar Rod

.100” Kovar Rod

1.625” Kovar Rod

.125” Kovar Rod

1.750” Kovar Rod

.156” Kovar Rod

1.875” Kovar Rod

.1875” Kovar Rod

2.000” Kovar Rod

.250” Kovar Rod

2.250” Kovar Rod

.312” Kovar Rod

2.500” Kovar Rod

.375” Kovar Rod

3.050” Kovar Rod

.500” Kovar Rod

3.500” Kovar Rod

.625” Kovar Rod

6.000” Kovar Rod

.750” Kovar Rod

 

 

Kovar Sheet

Kovar Sheet Thickness

Kovar Sheet Thickness

.010” Kovar Sheet

.062” Kovar Sheet

.015” Kovar Sheet

.070” Kovar Sheet

.020” Kovar Sheet

.080” Kovar Sheet

.025” Kovar Sheet

.083” Kovar Sheet

.030” Kovar Sheet

.090” Kovar Sheet

.035” Kovar Sheet

.100” Kovar Sheet

.040” Kovar Sheet

.1050” Kovar Sheet

.050” Kovar Sheet

.1250” Kovar Sheet

.060” Kovar Sheet

 

 

Kovar Plate

Kovar Plate Thickness

Kovar Plate Thickness

.164” Kovar Plate

.375” Kovar Plate

.187” Kovar Plate

.437” Kovar Plate

.230” Kovar Plate

.500” Kovar Plate

.250” Kovar Plate

.625" Kovar Plate

.281” Kovar Plate

.750” Kovar Plate

.312” Kovar Plate

1.000” Kovar Plate

 

Kovar Strip/Coil Annealed

Kovar Strip/Coil Thickness

Kovar Strip/Coil Thickness

.005” Kovar Strip/Coil

.030” Kovar Strip/Coil

.010” Kovar Strip/Coil

.040” Kovar Strip/Coil

.015” Kovar Strip/Coil

.050” Kovar Strip/Coil

.020” Kovar Strip/Coil

.060” Kovar Strip/Coil

.025” Kovar Strip/Coil

 

 

Kovar Strip/Coil Tempered

Kovar Strip/Coil Thickness

Kovar Strip/Coil Thickness

.010” Kovar Strip/Coil

.015” Kovar Strip/Coil


Kovar Applications

Power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.

Kovar Properties

 

Kovar Alloy Physical Properties

Density

lb/cu in

0.302

Specific Gravity

 

8.36

Curie Temp

°F

815

 

°C

435

Melting Point

°F

2640

 

°C

1449

Electrical Resistivity

Micro-ohm-cm

40

 

ohm-cir mil/ft

294

Thermal Conductivity

W/cm °C

0.17

 

BTU-in/sq. ft-hr-

120

Specific Heat

Cal/g- °C

0.11

 

BTU/lbm- °F

0.11

Thermal Expansion

ppm / °F (75°F to 842°F)

2.9

 

ppm / °C (25°C to 450°F)

5.3

 

Kovar Mechanical Properties

Tensile Strength

ksi

75

 

MPa

518

Yield Strength

ksi

40

 

MPa

276

Elongation

% in 2 in.

30

Typical Hardness Ann.

Rockwell HRB

80

Modules of Elasticity

Mpsi

30

 

kMPa

207

 

Kovar Chemistry

maximum % unless noted

Iron

Bal

Nominal Nickel

29

Nominal Cobalt

17

Carbon

0.02

Silicon

0.20

Chromium

0.20

 

Kovar Specifications

ASTM F-15/F-1466

MIL 1-23011 CL 1

AMS 1-23011 CL 1

 

Kovar Alloy Linear Coefficient of Thermal Expansion

Degree C

 

Degree C

 

30-100

--

30-450

5.1 - 5.5

30-150

--

30-475

--

30-200

5.5

30-500

6.2

30-250

--

30-525

--

30-300

5.1

30-550

--

30-325

--

30-600

7.9

30-350

--

30-700

9.3

30-375

--

30-800

10.4

30-400

4.6 - 5.2

30-900

11.5

30-425

--

30-1000

--

Underscored face values are the limits specified in MIL-I-23011C

 

 

ED FAGAN INC. supplies the highest quality special purpose metals and alloys for Aerospace/Aviation, Defense, Electronics, Magnetic, Medical, Lighting, Optical, Telecommunications, Ceramics, Heat Treating, and other high-technology industries.

1. Trademark Carpenter Technology Corp., Reading PA
2. Trademark ThyseenKrupp-VDM, Germany
3. Trademark Imphy Alloys, France
4. Trademark Special Metals Corporation, USA

Controlled Expansion Alloys

Ed Fagan Inc. stocks a variety of similar alloys for low expansion, controlled expansion, glass-to-metal or ceramic sealing applications that may also satisfy your needs. EFI carries:
Invar
Super Invar
Kovar
42 Alloy
46 Alloy
48 Alloy
52 Alloy

And we also have a large selection of other types of specialty metals and alloys for high technology applications, including:
Electrical/Electronic Nickel
Soft Magnetic Alloys
Refractory Metals and Alloys
Hard to Find Materials