Kovar / 1.3981

Nombres alternativos y comerciales
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

Los datos sobre este material han sido proporcionados por Hempel Special Metals.

A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

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Propiedades

General

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

Mecánica

Property	Temperature	Value
Coeficiente de Poisson	23.0 °C	0.32 [-] Show Supplier Material materials with Coeficiente de Poisson of 0.32 [-]
Módulo elástico	23.0 °C	207 GPa Show Supplier Material materials with Módulo elástico of 207 GPa

Aplicaciones térmicas

Property	Temperature	Value
Calor específico	23.0 °C	110 J/(kg·K) Show Supplier Material materials with Calor específico of 110 J/(kg·K)
Conductividad térmica	23.0 °C	17.3 W/(m·K) Show Supplier Material materials with Conductividad térmica of 17.3 W/(m·K)
Temperatura de fusión		1449 °C Show Supplier Material materials with Temperatura de fusión of 1449 °C

Eléctrico

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

Magnético

Property	Value
Temperatura de Curie	435 °C Show Supplier Material materials with Temperatura de Curie of 435 °C

Chemical properties

Property	Value
Carbono	0.04 % Show Supplier Material materials with Carbono of 0.04 %
Cobalto	17 % Show Supplier Material materials with Cobalto of 17 %
Hierro	Balance
Manganeso	0.5 % Show Supplier Material materials with Manganeso of 0.5 %
Níquel	29 % Show Supplier Material materials with Níquel of 29 %
Silicona	0.2 % Show Supplier Material materials with Silicona 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