Alloy K (Kovar®) Controlled Expansion Alloy

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Description

1.3981 (FeNi29Co17) is an iron-nickel-cobalt alloy whose chemical composition is controlled within narrow limits to ensure precise and uniform thermal expansion and mechanical characteristics. These properties make it an ideal alloy for use in high integrity glass-to-metal and ceramic-to-metal seals, particularly where the application requires resistance to thermal shock. It shows the following features and properties:


  • Uniform thermal expansion characteristics
  • Related Standards

    Equivalent Materials

    Los datos sobre este material han sido proporcionados por Matmatch.

    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

    PropertyTemperatureValue

    Densidad

    23.0 °C

    8.25 g/cm³

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    Mecánica

    PropertyTemperatureValue

    Dureza Vickers

    23.0 °C

    160 [-]

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    Elongación

    23.0 °C

    30 %

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    Límite elástico

    23.0 °C

    380 MPa

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    Módulo elástico

    23.0 °C

    139 GPa

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    Resistencia a la tracción

    23.0 °C

    540 MPa

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    Aplicaciones térmicas

    PropertyTemperatureValue

    Calor específico

    23.0 °C

    500 J/(kg·K)

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    Coeficiente de dilatación térmica

    30.0 °C

    4.6E-6 1/K

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    450.0 °C

    5.5E-6 1/K

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    Conductividad térmica

    23.0 °C

    17 W/(m·K)

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    Temperatura de fusión

    1450 °C

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    Chemical properties

    PropertyValue

    Cobalto

    17 %

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    Hierro

    53 %

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    Níquel

    29 %

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    Technological properties

    Property
    Application areas

    General: Power and microwave tubes, transistors and diodes, lids and closures in a variety of hybrid electronic circuit packages.