79NM Tube - Magnifer 7904
79NM permalloy refers to iron-precision alloys with high levels of permeability in weak magnetic fields. There nizkonikelevye (containing 50% Ni) and RICH (72−82% Ni) permalloys. This separation is caused by varying degrees of electromagnetic bias characteristics in the alloys of the first and second group. Labelling means that the alloy contains 78.5 — 80% Ni, which is 2-fold increase in the electrical resistance of the alloy as compared to nizkonikelevoy group.
The percentage of 10 to GOST 994−74.
In order to improve electromagnetic properties of permalloy doped with elements such as copper, chrome, molybdenum. The melting is carried out under the protection 79NM neutral gas or in a vacuum. Thin strips and sheets is cold-formed by a further annealing to enhance the magnetic properties.
Initially materials such 79NM used to reduce signal distortions in connection cables. Minimum magnetostriction allows the use of permalloy in precision magneto-mechanical devices, which need stability in an alternating magnetic field. Fluctuations in electrical resistance within 5%, may be caused by changes in strength and direction of the magnetic field. This alloy transformer produce plates for recording magnetic heads. Such alloys are used for the production of small-sized cores of power transformers, relays, inductors, and components of the magnetic circuits that operate at high inductions with low magnetization. Manufacture of magnetic screens and relay cores, pulse transformers, contactless relay and magnetic amplifiers. The practical significance of computer technology and automation purchased permalloys group 79NM having a rectangular hysteresis loop.
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