Kovar® Metal-Alloy Supplier

Product Overview

Kovar®, ASTM-F-15 Alloy, Alloy 29-17, Pernifer 2918®, Dilvar P1®, NILO K®

Eagle Alloys Corporation (EAC) is a leading global supplier of nickel iron controlled expansion alloys including Kovar® in foil, strip, coil, sheet, plate, wire, rod, bar, forged blocks and blanks. A wide variety of sizes are available from stock with immediate shipping. Eagle Alloys also supplies additional low expansion, controlled expansion, and glass-to-metal or ceramic sealing alloys including Invar®, Alloy 42, Alloy 46 Alloy, 47/50, 48, 49, and Alloy 52. EAC can supply soft magnetic Alloy 50, Hiperco 50 & 50A, and Vim Var Core Iron. Eagle Alloys Corporation is an ISO Certified Corporation and has been supplying the highest quality Kovar for over 35 years.

If Eagle Alloys does not have your exact requirement in stock, we can offer competitive pricing with short lead times.

Eagle Alloys Kovar Capabilities

Form
Min Size
Max Size
Foil / Strip / Sheet / Plate
0.015" Thk
up to 2" Thk
Rod / Bar / Forged Bar
0.040" Dia
up to 12" Dia
Wire / Coil
0.004" Thk
up to 0.070" Thk
*Custom sizes upon request

Kovar Stock Sizes Same Day Shipping (subject to prior sale)

Wire/Coil
  • 0.004" Thk
  • 0.0045" Thk
  • 0.005" Thk
  • 0.006" Thk
  • 0.007" Thk
  • 0.008" Thk
  • 0.0098" Thk
  • 0.010" Thk
  • 0.012" Thk
  • 0.0142" Thk
  • 0.0145" Thk
  • 0.015" Thk
  • 0.020" Thk
  • 0.025" Thk
  • 0.030" Thk
  • 0.035" Thk
  • 0.040" Thk
  • 0.043" Thk
  • 0.045" Thk
  • 0.050" Thk
  • 0.060" Thk
  • 0.062" Thk
  • 0.064" Thk
  • 0.070" Thk
  • 0.082" Thk
Foil/Strip/Sheet/Plate
  • 0.015" Thk x 12 & 24"w x 72"lg
  • 0.020" Thk x 12 & 24"w x 72"lg
  • 0.025" Thk x 12 & 24"w x 72"lg
  • 0.030" Thk x 12 & 24"w x 72"lg
  • 0.035" Thk x 12 & 24"w x 72"lg
  • 0.040" Thk x 12 & 24"w x 72"lg
  • 0.050" Thk x 12 & 24"w x 72"lg
  • 0.060" Thk x 12 & 24"w x 72"lg
  • 0.062" Thk x 12 & 24"w x 72"lg
  • 0.072" Thk x 12 & 24"w x 72"lg
  • 0.075" Thk x 12 & 24"w x 72"lg
  • 0.080" Thk x 12 & 24"w x 72"lg
  • 0.090" Thk x 12"w x 72"lg
  • 0.100" Thk x 12"w x 72"lg
  • 0.125" Thk x 12"w x 72"lg
  • 0.187" Thk x 15"w x 72"lg
  • 0.250" Thk x 15"w x 72"lg
  • 0.281" Thk x 15"w x 72"lg
  • 0.312" Thk x 15"w x 72"lg
  • 0.375" Thk x 15"w x 72"lg
  • 0.437" Thk x 15"w x 72"lg
  • 0.515" Thk x 15"w x 72"lg
  • 0.625" Thk x 15"w x 72"lg
  • 0.750" Thk x 15"w x 72"lg
  • 0.875" Thk x 15"w x 72"lg
  • 1" Thk x 15"w x 72"lg
  • 1.500" Thk x 15"w x 72"lg
  • 2" Thk x 15"w x 72"lg
  • ***Other sizes upon request
  • ***Best way to buy: Advise our sales team of your blank size and number of pcs. needed. You do not need to buy full sheets or plates.
Rod/Bar
  • 0.040" Dia
  • 0.050" Dia
  • 0.060" Dia
  • 0.062" Dia
  • 0.100" Dia
  • 0.125" Dia
  • 0.156" Dia
  • 0.178" Dia
  • 0.187" Dia
  • 0.200" Dia
  • 0.250" Dia
  • 0.312" Dia
  • 0.375" Dia
  • 0.437" Dia
  • 0.500" Dia
  • 0.562" Dia
  • 0.625" Dia
  • 0.750" Dia
  • 0.875" Dia
  • 1" Dia
  • 1.125" Dia
  • 1.250" Dia
  • 1.375" Dia
  • 1.500" Dia
  • 1.625" Dia
  • 1.750" Dia
  • 2" Dia
  • 2.125" Dia
  • 2.500" Dia
  • 3" Dia
  • 3.500" Dia
  • 6" Dia
  • Larger sizes made to order up to 12" Dia. Quick lead times and no minimum order quantity.

Kovar

About Kovar® Metal and Kovar® Alloys

Kovar® is an alloy made up of 29% nickel, 17% cobalt, .2% silicon, .3% manganese and 53.5% iron. Kovar® is known for its low coefficient of thermal expansion. Kovar is suitable for uses which require a matched expansion seal between metal and glass parts.  Kovar® end uses are usually glass sealing in the electronics industry.

Kovar not only has thermal expansion similar to glass, but its nonlinear thermal expansion curve can often be made to match a glass, thus allowing the joint to tolerate a wide temperature range. Chemically, it bonds to glass via the intermediate oxide layer of nickel(II) oxide and cobalt(II) oxide; the proportion of iron oxide is low due to its reduction with cobalt. The bond strength is highly dependent on the oxide layer thickness and character. The presence of cobalt makes the oxide layer easier to melt and dissolve in the molten glass. A grey, grey-blue or grey-brown color indicates a good seal. A metallic color indicates lack of oxide, while black color indicates overly oxidized metal, in both cases leading to a weak joint.

*Kovar is a registered trademark of CRS Holdings, Inc., a subsidiary of Carpenter Technology Corp.
*Pernifer 2918 is a registered trademark of ThyseenKrupp-VDM, Germany 
*Dilvar P1 is a registered trademark of Imphy Alloys, France 
*NILO K is a registered trademark of Special Metals Corporation, USA

*Above data is for informational purposes only.  Eagle Alloys is not liable for accuracy of these contents or applications. Finished part drawings may be forwarded to a third party for outsourcing.

Properties & Applications

Kovar Typical Applications

Kovar Specifications (upon request)

Kovar Standard Grades

Kovar®
           
ASTM-F-15 Alloy
           
Alloy 29-17
           
Pernifer 2918®
           
Dilvar P1®
Dilver is a registered trademark of Aperam Alloys Imphy, France
           
NILO K®
           

Common Industry Applications

STATEMENT OF LIABILITY - DISCLAIMER Any suggestion of product applications or results is given without representation or warranty, either expressed or implied. Without exception or limitation, there are no warranties of merchantability or of fitness for particular purpose or application. The user must fully evaluate every process and application in all aspects, including suitability, compliance with applicable law and non-infringement of the rights of others Eagle Alloys Corporation and its affiliates shall have no liability in respect thereof.

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Contact Eagle Alloys

Toll Free: 800.237.9012
Local: 423.586.8738
Fax: 423.586.7456

Email: sales@eaglealloys.com

Company Headquarters:
178 West Park Court
Talbott, TN 37877

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