1J42 iron-nickel alloy, nickel alloy plate

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齐全

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广泛

Iron-nickel alloy
. . A low-frequency soft magnetic material with high magnetic permeability and low coercive force in a weak magnetic field. Early iron-nickel alloys were used for telephone communications. Later, a heat treatment process and vacuum smelting method were used to greatly improve the alloy properties. The iron-nickel alloy containing
has a magnetic permeability about
~
times higher than that of silicon steel in a weak magnetic field. It is widely used in sensitive relays, magnetic shielding, telephone and radio transformers, precision AC and In DC instruments, current transformers (see transformers). By adding elements such as molybdenum, manganese, cobalt, copper, and chromium to iron-nickel alloys, ternary and quaternary iron-nickel alloys with greater initial magnetic permeability and maximum magnetic permeability can be obtained.
. . Iron-nickel alloy has a narrow and steep hysteresis loop, a large magnetic permeability and a small coercive force in a weak magnetic field,
but its resistivity is not large,< br/>Only suitable for operation in the frequency range below MHz, otherwise the eddy current loss will be too large. Iron-nickel alloy has good processing performance and can be made into various components with complex shapes and precise size requirements. However, its magnetic properties are sensitive to mechanical stress, and process factors have a greater impact on the magnetic properties. For example, stamping will cause a decrease in the magnetic properties, so the product performance consistency is not easy to meet. The cost of iron-nickel alloy is high. The properties and uses of commonly used iron-nickel alloys are listed in the table.
. . In addition to Invar, Kovar and Permalloy, iron-nickel alloys also include the following alloys: ++
and 3++
, which have high Thermal expansion coefficient can be used as bimetallic sheet of thermostat, heat exchanger and various temperature regulating devices. +
, called a substitute for platinum, has the same expansion coefficient as platinum, has good corrosion resistance, and can replace platinum in some occasions. +
, can be used as vacuum tube sealing wire instead of platinum. 3++
, is a constant elastic alloy with a thermoelastic coefficient equal to zero. It is commonly used as hairpins, watch balance wheels and precision instrument parts. The ingot is made by melting method and processed into materials by pressure.