NiCo29−18 alloy, Kovar, Nilo
Magnetic alloys «Kovar», «Nilo» consists of iron (52−54%), nickel (29%), cobalt (the rest). A presence of cobalt in composition (17−18%) considerably increases cost of a material. 29NK has next to nothing coefficient of linear expansion, a conductance is three times as high as a conductance of invar. There are manufactured the condensers with a small TKE and variable capacity out of kovar. Alloy corrodes in humid conditions, thereby appears a necessity in protection cover. At a manufacturing of condensers, it is covered with a metal of a high conductance (generally, it is silver). Soldered in a glass wire, forms a reliable hermetic joint. It is used in current lead structures and bases of vacuum-tube devices.
Percentage composition of «Kovar», «Nilo» GOST 10994−74
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Manufacture of various components of radio-electronic devices. Magnetic precision alloys «Kovar», «Nilo» have a low index of heat expansion (at a range of 20 — 400°C) and a high heat resistance (19V/m°С,). It forms a very consistent and hermetic joint, positioning it as an indispensable material in manufacturing electro-vacuum devices.
Such an alloy (containing iron in its basis) corrodes in conditions of a high humidity. That is why it requires a special protective cover. Automatic arc welding is manufactured with a help of welding wire of grade 04H20N10G2B that consists of anti-corrosive steel. It is often used at a high humidity for welding metallic structures in nuclear and power engineering industries.
Physical characteristics of «Kovar», «Nilo» alloys
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