Overview

Permalloy 1J85 is a commonly used iron-nickel soft magnetic alloy. The magnetism of 1J85 is very sensitive to internal stresses and impurities. The components after forming must be annealed at high temperature in a protective atmosphere or vacuum to purify the material, eliminate internal stress and improve magnetic properties.

1J85 has high initial permeability, maximum permeability, high saturation magnetic induction strength and low coercivity under weak magnetic field, and is easy to be processed into filaments and thin strips for magnetic heads, iron cores, magnetic conductors, magnetic shields and sensors working under weak magnetic field.

Because the alternating magnetization is the internal eddy current loss of the material, the smaller the resistivity of the material, the greater the thickness, and the higher the frequency under the alternating magnetic field, the greater the eddy current loss, and the magnetic property is reduced a lot. Therefore, the material must be made into a thinner sheet (strip), and the surface is coated with an insulating layer, or a certain method is used to form an oxidized insulating layer on the surface. Generally, 1J85 uses an electrophoretic coating of magnesium oxide.

1J85 is generally used under alternating magnetic fields, and its resistivity is low, which is not easy to use at high frequencies.

Limiting Chemical Composition, %

Nickel..................................................................................................................................................................................79.00-81.00

Molybdenum...........................................................................................................................................................................4.80-5.20

Manganese..............................................................................................................................................................................0.30-0.60

Carbon.....................................................................................................................................................................................0.03 max.

Copper.....................................................................................................................................................................................0.20 max.

Iron......................................................................................................................................................................................12.63-15.75

Phosphorous...........................................................................................................................................................................0.02 max.

Silicon......................................................................................................................................................................................0.15-0.30

Sulfur.......................................................................................................................................................................................0.02 max.

Physical Constants

Tensile Properties

Heat treatment

Solution annealing: The 1J85 nickel-based alloy is heated to a solution temperature (generally at 1100-1150 ° C), held for a certain time, and then quickly cooled to room temperature. Solid solution annealing can make the susaturated solid solution phase in the alloy dissolve uniformly and improve the ductility and ductility of the alloy.

Quenching annealing: The 1J85 nickel-based alloy is heated to the solution temperature, and then quickly cooled to room temperature, so that the grains in the solution phase are refined. The annealing process is then carried out at a specific temperature and time depending on the alloy composition and product requirements.Oil, grease, paint and all other contaminants must be removed before annealing. During hydrogen annealing, the individual parts should be separated by inert insulating powders such as magnesium and alumina.

Vacuum heat treatment can be used, but it usually results in a loss of magnetism compared to heat treatment in a dry hydrogen atmosphere.

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