Glass Sealing Alloy Foil (Fe54/Ni29/Co17)

Glass Sealing Alloy Foil (Fe54/Ni29/Co17) is a precision-rolled metal designed for high-fidelity sealing with technical and borosilicate glasses. This foil form offers superior thinness and surface conformity, enabling minimal interface resistance and enhanced hermetic sealing performance. The Fe-Ni-Co alloy's carefully balanced thermal expansion coefficient ensures compatibility with glass during thermal cycling, reducing stress and preventing fracture propagation. It is extensively employed in hermetically sealed photonic packages, X-ray and microwave vacuum tubes, and optoelectronic sensor systems. The foil format particularly benefits edge bonding in glass-to-metal transitions and acts as a metallization interface in high-precision windows and fiber-optic feedthroughs. Its application in microfabricated devices and cryogenic vacuum assemblies underscores its critical role in miniaturized and high-performance systems. As cutting-edge technologies demand thinner, lighter, and more robust seals, Glass Sealing Alloy Foil (Fe54/Ni29/Co17) stands at the forefront of metallurgical integration in advanced materials engineering.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Foil

Thickness	<0.01mm	±25%
Thickness	0.01mm - 0.05mm	±25%
Thickness	>0.05mm	±10%

Material Properties for Alloys

Mechanical Properties

Element	Value
Elongation at break( % )	30
Modulus of elasticity( GPa )	207
Tensile strength( MPa )	510-520

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	48.9
Temperature coefficient( K⁻¹ )	0.0037

Magnetic Properties

Element	Value
Curie temperature( C )	435

Thermal Properties

Element	Value
Melting point( C )	1450
Specific heat( J K⁻¹ kg⁻¹ )	439@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	17.3@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	4.81@20-200°C