JPS58197804A - Forming method for inter-layer insulating film made of amorphous magnetic material - Google Patents

Abstract

PURPOSE:To form the inter-layer insulating film at a temperature or less of crystallization of a blank by bringing an aqueous solution containing only sodium dihydrogen phosphate or a treating liquid, in which an oxidizing agent, such as chlorate, bromate, etc. promoting a film formation reaction is contained in said aqueous solution, into contact with the amorphous material. CONSTITUTION:The amorphous magnetic material is brought into contact with only 5-20g/l sodium dihydrogen phosphate (NaH2PO4) or an aqueous solution, in which a 0.5-20g/l compound of sodium salt or potassium salt or the like of chloric acid, bromic acid, tungstic acid, nitric acid or nitrous acid is made contain in said phosphate and 0.05-0.8g/l sodium carbonate and a surface-active agent are made contain as required, and the inter-layer insulating film is formed to the surface of the amorphous magnetic material at the temperature or less of crystallization of the blank.

Description

[Detailed Description of the Invention] Amorphous magnetic alloys have properties such as high electrical resistivity, high magnetic permeability, high magnetic flux density, and low coercive force, which are ideal as materials for laminated cores. When applied, transformers and electric motors with low iron loss can be manufactured.

On the other hand, it is well known that the magnetic properties of laminated cores can be improved by adding an interlayer insulation film to the core material, as seen in electric iron plates. The formation method riZ has not yet been established.

Amorphous magnetic materials are water-cooled in a molten state 224 etc. 4! - Because it is manufactured by ultra-quenching without contact, the thickness of the shape is 4
Because it appears as a glue line with a thickness of about 0.

When manufacturing a laminated core using an amorphous material, an interlayer insulating film is required to have the following properties.

(1) In the process of forming an insulating film, the material will not be heated above its crystallization temperature and lose its amorphous properties.

(2) The application of an insulating film causes deformations such as warpage and distortion in the thin i material, which causes deterioration of magnetic properties.

(3) In the process of manufacturing the laminated core, strain relief and annealing (365℃
×! Because step h) is essential.

This heating should not cause deterioration of the film or deformation of the material.

(4) When manufacturing a laminated core using an amorphous material, the thickness of the insulating film should be as thin as possible from the viewpoint of the space factor, as this will result in the stacking of many thin materials.

Previous attempts have been made to coat amorphous materials with low-melting glass or resin as an insulating film, but these attempts failed because the materials deformed and the magnetic properties deteriorated.

Therefore, as a result of various experimental studies, the present inventors found that Vhri, an aqueous solution containing only sodium dihydrogen phosphate, was sprayed or immersed in a treatment solution containing oxidizing agents such as chlorate and bromate to promote the film-forming reaction. By bringing it into contact with an amorphous material, the crystal temperature of the material (39
It was discovered that a thin interlayer insulating film containing iron phosphate as a main component can be formed at temperatures below 0°C.

That is, in the first invention, an amorphous magnetic material is mixed with 5 to 20 f/l of sodium dihydrogen phosphate (NmH snow PO4) alone or with sodium salts of chloric acid, bromic acid, tungstic acid, nitric acid, and nitrous acid. or contacting 1 s or more of a compound selected from potassium salts with an aqueous solution containing 0.5 to 20 f/l, and optionally 0.0 t', 8 f/l of sodium carbonate and a surfactant; A method for forming an interlayer insulating film on an amorphous magnetic material, characterized by forming an interlayer insulating film on the surface of the amorphous magnetic material at a temperature below the crystallization temperature of the material.

A second invention is to further apply an aqueous solution containing 1 to 10 f/l of 0r03 to the edge treated in the first invention to form an interlayer on the surface of the amorphous magnetic material at a temperature below the crystallization temperature of the material. This is a method for forming an interlayer insulating film of an amorphous magnetic material, characterized by forming an insulating film.

These liquid compositions are known as acid iron coating treatment liquids for steel, and by adding a surfactant to the treatment liquid, degreasing and film formation can be performed simultaneously.

If the amount of sodium dihydrogen phosphate is outside the range of 5 to 20 f/l, it is dangerous to obtain a uniform film.
The amount of bromate oxidizing agent added is 0.5 to 20 f/L.
If the amount is less than this range, the effect of promoting the film forming reaction will not be recognized, and if it is too much, the surface of the amorphous material will be passivated.Addition of sodium carbonate is effective in stabilizing the bath.

The insulating film forming process in the present invention is carried out under the same temperature range (40 to 60°C) and pH (I) as known conditions.

Furthermore, in the second invention, the amount of Or OB is 1 to 10 t.
If the paper weight is less than 7t, the sealing of the iron phosphate coating by chromic acid will not be performed sufficiently, and no increase in the rounding interlayer resistance value will be observed, and if it is too large, the color tone of the coating will likely be uneven. Moreover, since the amount of chromic acid carried out with the treated material increases, it is economically disadvantageous.

According to the present invention, an insulating film can be formed on the surface of an amorphous magnetic material without causing deformation of the material, and the interlayer resistance of the formed film even after annealing in Hl-Nl gas at ri365°C rt did not decrease.

Also, no deformation of the material due to annealing was observed.

Hereinafter, an embodiment of the present invention will be described for the next commute.

Example 1 Sodium dihydrogen phosphate 5t, sodium chlorate 3F,
A solution prepared by dissolving 4 t of sodium nitrate and 2 f of potassium nitrite in 1 t of water was adjusted to pH 5.

Arit Keokarya A11i@dO after degreasing this liquid
hcmicm1) M amorphous magnetic alloy (product name: Metg
las2110580. Ingredients Fest Btsi8
! 5uch) at SO ℃ for 2 minutes, washed with water, and dried at 90 ℃ for 10 minutes. Through this treatment, the interlayer resistance of the amorphous material is 2
．． The resistance value increased from 0Ω/sheet to 11.59/sheet, and no deformation of the material was observed. )(s-f' at 365℃×2)
Even after annealing in H gas, the interlayer resistance value did not change, and there was no deformation of the material.

Example 2 11 t of sodium dihydrogen phosphate, 0.051 of surfactant I lyoxyethylene sorbitan monoole) and 0.11 F of sodium carbonate were dissolved in 1 tK of water.

The solution adjusted to pH 5 was sprayed onto the same amorphous magnetic material in Example 1 at 50°C for 3 minutes, washed with water, and then sprayed at 100°C for 10 minutes.
Dry for a minute. Through this treatment, the amorphous material was degreased and an insulating film formed at the same time, and the interlayer resistance after treatment increased to 139/sheet at a load of 300 f. Furthermore, this sample was immersed for 20 seconds in an aqueous solution containing Or 01 and 101/ at 45°C, and then dried at 100°C for 10 minutes. ? - The resistance between the eyebrows increased to tiZSΩ/sheet, and no deformation of the material was observed. Annealing in H, -N at 3mS°C for 2h did not change the glabellar resistance value and did not cause any deformation of the material.

Example 3 Sodium dihydrogen phosphate 20t, sodium bromate o,
sr, sodium nitrate 20F and sodium carbonate 0.
The same amorphous material as in Example 1 was degreased and immersed in a solution whose pH was adjusted to 5 after dissolving 05F in 1 t of water at a temperature of 0° C. for 3 minutes.

After washing this sample with water, add 0r03 to a solution containing 1 f/40
It was immersed at 100°C for 20 seconds and then dried at 100°C for 10 minutes.

As a result of this treatment, the interlayer resistance increased to 21Ω/sheet at a load of 3002, and no deformation of the material was observed. 365℃
The resistance value between the four layers did not change due to H, -N, and medium annealing of X2h, and no deformation of the material occurred.
As described above, according to the present invention, an amorphous magnetic alloy can be made thin and with a small interlayer resistance value without causing deformation such as distortion or distortion to the material below the temperature at which an amorphous magnetic alloy crystallizes. An insulating film can be formed. Also, by using this material, it has become possible to manufacture an outer laminated core with smaller iron loss than that using conventional electromagnetic hard plates.

Claims (2)

[Claims] (1) Amorphous magnetic material with 5-2 Of/l (D sodium dihydrogen phosphate (Na)IsPOa) alone %Ari
4. Contains 0.5 to 20 tons of one or more compounds selected from sodium salts of chloric acid, bromic acid, tungstic acid, nitric acid, and nitrous acid or potassium salts. More must-haves
The method is characterized by forming an interlayer insulating film on the sole surface of the amorphous magnetic material at a temperature below the crystallization temperature of the material by contacting it with an aqueous solution containing sodium carbonate and a surfactant of "co, os-ast7t" according to K. A method for forming an insulating film between the eyebrows on an amorphous magnetic material. (2) Sodium dihydrogen phosphate (NaHsP04) Mll! of 5-2 rJf/l of amorphous magnetic material! Some trout are treated with chloric acid, bromate, tungstic acid, and nitric acid. Contains 0.8-20t/of a compound or one or more selected from sodium salts or potassium salts of nitrous acid, and further contains 0.05-0.8f/l of sodium carbonate and surfactant as necessary. 1 to 10 t after contacting with an aqueous solution containing
A method for forming an interlayer insulating film on an amorphous magnetic material, comprising applying an aqueous solution containing 0r01/l to form an interlayer insulating film on the surface of the amorphous magnetic material at a temperature below the crystallization temperature of the material.