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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

    This material data has been provided by Matmatch.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    Properties

    General

    PropertyTemperatureValue

    Density

    23.0 °C

    8.25 g/cm³

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    Mechanical

    PropertyTemperatureValue

    Elastic modulus

    23.0 °C

    139 GPa

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    Elongation

    23.0 °C

    30 %

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    Hardness, Vickers

    23.0 °C

    160 [-]

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    Tensile strength

    23.0 °C

    540 MPa

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    Yield strength

    23.0 °C

    380 MPa

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    Thermal

    PropertyTemperatureValue

    Coefficient of thermal expansion

    30.0 °C

    4.6E-6 1/K

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    450.0 °C

    5.5E-6 1/K

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    Melting point

    1450 °C

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    Specific heat capacity

    23.0 °C

    500 J/(kg·K)

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    Thermal conductivity

    23.0 °C

    17 W/(m·K)

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    Chemical properties

    PropertyValue

    Cobalt

    17 %

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    Iron

    53 %

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    Nickel

    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.