RU2094875C1 - Manufacturing process for high-saturation-inductance alloys - Google Patents

Abstract

FIELD: manufacture of alloys for magnetic cores, pole shoes of rotors and stators of electrical machines, telephone membranes, etc. SUBSTANCE: magnetically soft alloys having saturated inductance of 1.5-2.4 T are produced using electrolytic iron as basic alloy obtained by no-water electrolysis at 500-750 C, current density at anode of 0,2-0,3 A/cm² and at cathode, of 0,9-1,5 A/cm², followed by roasting in hydrogen at 850-890 C for two hours; this alloy is used as base for producing alloy 3KYuKh-VI which is then subjected to sheet-bar forging, etching, hot rolling, normalizing, cold rolling, and vacuum annealing. EFFECT: improved physical and chemical properties of alloy due to reduced coercive force. 3 tbl

Description

 The invention relates to metallurgy, in particular, to soft magnetic alloys with high induction of magnetic saturation.

The method allows the manufacture of soft magnetic alloys with a magnetic saturation induction of 1.5-2.4 T, which are used in electromagnetic technology for the manufacture of magnetic cores, pole pieces, rotors and stators of electric machines, telephone membranes, magnetostrictive elements, etc. [one]
The purpose of the invention is the improvement of physical and mechanical properties and the improvement of the technological process for producing soft magnetic alloys with high induction of magnetic saturation.

 Known magnetically soft alloy (autosw. N 113969) which describes the composition of the alloy 49K2FN-VI alloy is obtained by the following operations: alloy smelting in vacuum induction furnaces, forging on the flap, chemical board, hot rolling to a thickness of 1.5 mm normalization in hydrogen, then cold to a thickness of 0.25 mm, annealing to obtain normalized properties at 830 ± 30, 3 hours in vacuum.

 From a tape of a soft magnetic alloy 49K2FN-VI, plates of rotors of a continuous configuration are cut down, which allows to increase the sensitivity and speed of small electric machines.

 Known magnetically soft alloy 3KYUH-VI which is used for the manufacture of telephone membranes and other purposes.

 The normalized properties of soft magnetic alloys 49K2FN-VI and 3KYuH-VI, made on the basis of 008ZhR grade iron, are given in Table 1.

The prototype adopted the method of production of 3KYUH-VI alloys, which includes the following operations: alloy smelting in vacuum, forging on a flap, chemical etching, hot rolling to a thickness of 1.5 mm, normalization in hydrogen, rolling to a thickness of 0.25 mm, annealing in vacuum to obtain normalized properties at t 850 ± 50 ^o C, 3 hours

 The disadvantage of the manufacturing method of the above alloys is a high coercive silav, as well as a high duration of the final annealing, 3-6 hours

 The purpose of the invention is the increase of physical and mechanical properties by reducing the coercive force and improving the technological process for the production of alloys with high induction of magnetic saturation by reducing the time of final annealing.

 The purpose of the invention is achieved in that electrolytic iron with a low coercive force is used as the basis of alloys (ed. St. N 1629161).

 The advantage of the proposed method for the manufacture of alloys with high induction of magnetic saturation is a decrease in coercive force, and therefore, an increase in magnetic permeability and a decrease in the time of final heat treatment of the alloys.

A method of manufacturing soft magnetic alloys with high induction of magnetic saturation is carried out as follows: electrolytic iron of the ПЖЭ-2 grade is produced by electrolysis at t 500-750 ^o С in an anhydrous electrolyte and heat-treated raw powder in hydrogen at t 850-890 ^o С for 2 hours. Next, alloys are smelted in vacuum induction furnaces using electrolytic iron of the ПЖЭ-2 grade as the basis of alloys. An ingot is forged on a slider, chemical etching is carried out, it is rolled into hot, normalized, rolled into cold and annealed to obtain final properties.

Example: 3KYuH-VI alloy was prepared as follows: PZhE-2 grade electrolytic iron, the base of the alloy, is obtained by electrolysis of iron pellets at t 500-750 ^o С, current density at the anode 0.2-0.3 A / cm ² and at the cathode 0.9-1.5 A / cm ^{2 is} heat treated in hydrogen at t 890 ^o C for 2 hours. Electrolytic iron of the ПЖЭ-2 grade is characterized by a coercive force of 110-120 A / m.

Alloys are smelted in a Balcer vacuum induction furnace. The chemical composition of wt. alloys are given in table. 2. Ingots are forged on a slider, rolled into hot to a thickness of 1.5 mm normalization in hydrogen, then into cold to a thickness of 0.25 mm, the tape is annealed in a vacuum furnace with a residual pressure of 10 ^-7 mm RT. column at t 900 ^o C, 1 h. Magnetic properties and heat treatment modes of the alloys are given in table. 3.

 The proposed method for the manufacture of soft magnetic alloys with magnetic saturation induction of 1.5-2.4 T has a technical continuity, i.e. all operations of mechanical and thermal processing of alloy ingots into a tape are performed on the same equipment as the processing of alloys based on 008 ЖР grade iron, except for the operation of producing electrolytic iron with low coercive force.

 The use of low-coercive iron PZHE-2 as a basis for alloys makes it possible to reduce the coercive force of alloys by 15-30% with respect to the coercive force of alloys made on the basis of 008ЖР iron, increase the magnetic permeability and increase the ductility of alloys.

 The use of low-coercive iron of the ПЖЭ-2 grade as the basis of alloys allows one to sharply reduce the time of final heat treatment from 3-6 hours to 1 hour, practically preserving the temperature range of heat treatment.

 The proposed method for the manufacture of alloys with high induction of magnetic saturation can be used to obtain high and low alloy alloys.

 Sources of information.

 1. TU 14-1-4341-87 Cold-rolled tape from soft magnetic alloy 49K2FN-VI.

 2. TU 14-1-4267-87 Cold-rolled tape made of 3KYUH-VI magnetically soft alloy.

Claims (1)

A method of manufacturing alloys with high induction of magnetic saturation, including smelting of an iron-based alloy, forging on a flap, chemical etching, hot rolling, normalization, cold rolling, annealing in vacuum, characterized in that before smelting, iron is produced by electrolysis at 500,750 ^° C, the current density at the anode is 0.2 0.3 A / cm ² and at the cathode 0.92 - 1.5 A / cm ² and annealed in hydrogen at 850 890 ^o C for 2 hours

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