Year1
- 规格：
- 齐全
- 包装：
- 标准
- 用途：
- 广泛
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 magnetic permeability of iron-nickel alloy containing %
in a weak magnetic field is about
~
times higher than that of silicon steel. It is widely used in sensitive relays, magnetic shielding, telephone and radio transformers, precision AC and In DC instruments, current transformers (see transformers). Adding molybdenum, manganese, cobalt, copper, chromium and other elements to iron-nickel alloys can produce ternary and quaternary iron-nickel alloys with greater initial magnetic permeability and large magnetic permeability.
The iron-nickel alloy has a narrow and steep hysteresis loop and has a large magnetic permeability and a small coercive force in a weak magnetic field
But its resistivity is not large
It is only suitable for Work in the frequency range below MHz otherwise the eddy current losses will be too great. 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 relatively sensitive to mechanical stress. Process factors have a greater impact on the magnetic properties, such as stamping, which will reduce the product performance consistency. 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 ++
Have high thermal expansion coefficients and can be used as Bimetallic heat exchangers of thermostats and various temperature regulating devices. +
It is called platinum substitute. The expansion coefficient is the same as platinum and has good corrosion resistance. It can replace platinum in some occasions. +
Can be used as vacuum tube sealing wire instead of platinum. ++
It is a constant elastic alloy with a thermoelastic coefficient equal to zero and is often used as hairpins, watch balance wheels and precision instrument parts. Molten ingots are processed into finished products by pressure.
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