Precision alloys.

Precision alloys (from the French. précision - accuracy), metal alloys with special physical properties (magnetic, electrical, thermal, elastic) or a rare combination of physical, physicochemical and mechanical properties, the level of which is not known.Most precision alloys are based on Fe, Ni, Co, Cu, Nb. Precision alloys include a number of alloys with anomalies of properties, among which a special place is occupied by alloys with a very small change in physical parameters when changing temperature, magnetic, electric field, mechanical loads (for example, invar, elinvar, manganin, constantan, perminvar). Important practical value are also alloys, characterized, on the contrary, by a very large change in physical parameters when external conditions change (for example, permalloy, alumel, chromel, kole, magnetostrictive materials, spring alloys, thermobimetals).

Precision alloys also include alloys with superconductivity, alloys with a given value of physical parameters (for example, insidious, platinum, fernico), including alloys with a diverse combination of properties and alloys that retain the required properties in aggressive environments, vibration, electric discharge, radiation, deep vacuum, etc.

Precision alloys are indispensable materials in the manufacture of units of particularly sensitive devices and installations, unique experimental and small-sized equipment, various kinds of sensors, energy converters. They are also used in household appliances, for example in televisions, radios, clocks, etc. Precision alloys are the basis for the progress of precision instrumentation, automation, and other branches of technology; they are made mainly in the form of thin tape and wire, as well as in the form of forgings, sheets, rods, polymetallic wire and tape, single crystals. To achieve the highest level of properties, precision alloys are required, as a rule, special methods of smelting, deformation, special heat treatment regimes, high-quality surface finishing. Precision alloys require a high culture of operation.

29NK - 79NM

  Application 29NK - Kovar
for vacuum adhesions of elements of radio-electronic equipment with glasses C49-1, C52-1, C48-1, C47-1; TCR*1,000,000 in the temperature range from -70 to +420 oC not more than 4.5-6.5 [1/oC] Application 36NXTU
for elastic sensitive elements operating at temperatures up to 250 degrees. S

Application 50 N
for cores of interlamp and small-sized power transformers, throttles, relays and parts of magnetic circuits operating at increased inductions without magnetization or with slight magnetization; the alloy has increased magnetic permeability and increased induction of technical saturation

Application of 79NM
for cores of small transformers, throttles and relays operating in weak fields of magnetic screens; the alloy has the highest magnetic permeability in weak fields