Kovar (Nilo®, Alloy K) / 1.3981 / UNS K94610
Kovar® is a nickel-iron-cobalt alloy with a coefficient of thermal expansion like that of hard glass. Since Kovar Alloy is tough and versatile, while employing extensive quality controls throughout UNS K94610 alloy’s manufacturing process to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining are consistently achieved. Furthermore, the coefficient of thermal expansion (CTE) of Kovar® is its most dynamic mechanical property. It's expansion characteristics match both borosilicate (or Pyrex) glasses and alumina ceramics. This alone ensures it is a highly popular controlled expansion alloys for hermetic sealing applications (also known as Glass to Metals Sealing).
Kovar metal powder for 3d metal printing
We are pleased to offer you powder for 3D printing made of Kovar. Send us your inquiry.
Material Data Sheet
ASTM | F15 |
UNS | K94610 |
AMS | I-23011 CL1 |
Main fields of application
Kovar is used for:
- Hermetic sealing
- Production of transistors and diodes in electronic industry
- Vacuum systems in chemistry and scientific research
- Electronic tubes (power, microwave, X-Ray)
- Hybrid circuit casings
- Oscillator housings
- Concentrated solar power
- Scientific instruments
Chemical composition of Kovar
Ni | Co | Fe | Mn | Si | C |
29 | 17 | Balance | 0.5 | 0.2 | 0.04 |
Mechanical properties of Kovar
Density g/cm³ | 8.26 | |
Curie Temp | °F 815 | °C 435 |
Melting Point | °F 2640 | °C 1449 |
Modulus of Elasticity at 20°C | MPa | 207 |
Specific Heat | J/g- °C | 0.11 |
Thermal Conductivity at 20°C | W/m.k | 17.3 |
Thermal Expansion | W.m-¹°C | 0.17 |
Electrical Resistivity | mm²/m | 49 |
Poisson's coefficient | 0.317 |
Delivery program
Material is mainly used in bars or as wire. Various dimensions are available upon request.
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Product Count
Coil (36)
Coil slit strip (26)
Sheets & plates (1688)
Tubes round (79)
Full material square-cut (18)
Tubes quadratic or rectangular (3)
Hexagon-Shape (13)
U-Shape (1)
Wire Coil (3)
Flat Steel (9)
Cuts, fittings, other shapes (21)
Disk (3)
Round bars (269)
Ingots "square" (8)
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