Alloys: Fernico
The name fernico is given to a family of metallic alloys, including Kovar and Dumet. The name comes from the fact that these alloys primarily consist of iron (Fe), nickel (Ni), and cobalt (Co).
Few commercial applications exist for these alloys. The thermal properties are the primary draw, and allow for these alloys to be used in metal-to-glass seals (because the thermal expansion coefficients of these alloys are close to those of typical glasses).
Sources/Further Reading: (Image 2 - Wikipedia) (Soft Magnetic Alloys) (Make it From) (1941 article)
Image 1 source.













