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
Kovar
42 Alloy
42-6 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