Kovar / 1.3981

Alternative und Handelsbezeichungen
Alloy K, Nilo®, Kovar

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Description

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).

Related Standards

AMS I-23011

Equivalent Materials

Diese Materialdaten wurden von Hempel Special Metals zur Verfügung gestellt

Alle Daten beziehen sich auf Raumtemperatur soweit nicht anderweitig spezifiziert. SI Einheiten werden verwendt soweit nicht anderweitig spezifiziert.
Äquivalente Standards sind ähnlich zu einem oder mehreren Standards die der Anbieter angegeben hat. Manche äquivalente Standards können strikter sein oder außerhalb der Bedingungen des ursprünglichen Standards.

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Eigenschaften

Allgemein

Property	Temperature	Value
Dichte	23.0 °C	8.26 g/cm³ Show Supplier Material materials with Dichte of 8.26 g/cm³

Mechanisch

Property	Temperature	Value
Elastizitätsmodul	23.0 °C	207 GPa Show Supplier Material materials with Elastizitätsmodul of 207 GPa
Poissonzahl	23.0 °C	0.32 [-] Show Supplier Material materials with Poissonzahl of 0.32 [-]

Thermisch

Property	Temperature	Value
Schmelzpunkt		1449 °C Show Supplier Material materials with Schmelzpunkt of 1449 °C
Spezifische Wärmekapazität	23.0 °C	110 J/(kg·K) Show Supplier Material materials with Spezifische Wärmekapazität of 110 J/(kg·K)
Wärmeleitfähigkeit	23.0 °C	17.3 W/(m·K) Show Supplier Material materials with Wärmeleitfähigkeit of 17.3 W/(m·K)

Elektrisch

Property	Temperature	Value
spezifischer Widerstand	23.0 °C	4.9E-7 Ω·m Show Supplier Material materials with spezifischer Widerstand of 4.9E-7 Ω·m

Magnetisch

Property	Value
Curie-Temperatur	435 °C Show Supplier Material materials with Curie-Temperatur of 435 °C

Chemical properties

Property	Value
Eisen	Balance
Kobalt	17 % Show Supplier Material materials with Kobalt of 17 %
Kohlenstoff	0.04 % Show Supplier Material materials with Kohlenstoff of 0.04 %
Mangan	0.5 % Show Supplier Material materials with Mangan of 0.5 %
Nickel	29 % Show Supplier Material materials with Nickel of 29 %
Silizium	0.2 % Show Supplier Material materials with Silizium of 0.2 %

Technological properties

Property

Application areas

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