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Formula: Fe 54/Ni 29/Co 17
Form: Disk
Material: Nickel/Iron/Cobalt - Glass Sealing Alloy (Kovar®)
Commodity: Alloys
Temper: Annealed

Glass Sealing Alloy Disk (Fe54/Ni29/Co17)

Glass Sealing Alloy Disk (Fe54/Ni29/Co17) is precision-fabricated from a ternary alloy specifically engineered for thermal compatibility with technical glasses. Its composition of iron, nickel, and cobalt provides a matched coefficient of thermal expansion, critical for forming hermetic seals that endure thermal stress without delamination or cracking. The disk format offers excellent uniformity and dimensional stability, making it a preferred component in diagnostic sensors, vacuum feedthroughs, and aerospace instrumentation. It plays a pivotal role in pressure-sealed enclosures for microwave technologies, photomultiplier tubes, and high-reliability telemetry devices. These applications benefit from the disk's consistent sealing performance under high-temperature and vacuum conditions. Its refined grain structure and chemical stability enable high-strength, leak-free bonding with borosilicate and similar glass compositions. As scientific demands intensify in cryogenics, satellite payloads, and advanced optics, Glass Sealing Alloy Disk (Fe54/Ni29/Co17) remains vital in pushing the frontier of metal-glass integration technologies across research and high-tech manufacturing.

Health hazard/Hazardous to the ozone layer

Serious health hazard

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Tolerances

Disc
Thickness >0.05mm ±10%
Thickness <0.01mm ±25%
Thickness 0.01mm - 0.05mm ±15%

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
Physical Properties
Element Value
Density( gcm⁻³ ) 8.36-8.5

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