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Treating solution for forming fluoride coating film and method for forming fluoride coating film

A technology for treating liquids and fluorides, which is applied in the direction of magnetic objects, magnetic materials, electrical components, etc., can solve the problems of no research on the composition of insulating films, no record of the structure of the processing liquid, and difficulty in seeking magnetic properties.

Inactive Publication Date: 2008-10-01
HITACHI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] In the aforementioned Patent Documents 1 to 4, although a fluoride insulating film is formed using a fluoride-containing solution, a gelled fluoride, or a sol solution, there is no description on the structure of the treatment liquid.
In addition, in the above-mentioned Patent Document 5, although there is a description about the treatment liquid, there is no study on the structure suitable for the formation of the insulating film, and the study on the interatomic distance and the interplanar distance of the main components constituting the solution has not been completed.
Therefore, in the conventional fluoride insulating film formation technology, there is a problem that it is difficult to sufficiently improve the magnetic properties due to the non-uniformity of the coating film, the prolonged heat treatment process, and the high temperature.

Method used

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  • Treating solution for forming fluoride coating film and method for forming fluoride coating film
  • Treating solution for forming fluoride coating film and method for forming fluoride coating film
  • Treating solution for forming fluoride coating film and method for forming fluoride coating film

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The treatment solution for forming the rare earth fluoride or alkaline earth metal fluoride coating film was prepared as follows.

[0058] (1) Introduce 4 g of a salt with high solubility in water, such as lanthanum acetate or lanthanum nitrate in the case of La, into 100 mL of water, and stir with a vibrator or an ultrasonic stirrer until it is completely dissolved.

[0059] (2) Slowly add to generate LaF 3 The chemical reaction equivalent number is diluted to 10% hydrofluoric acid.

[0060] (3) Use an ultrasonic stirrer for LaF that generates a gel-like precipitate 3 The solution was stirred for more than 1 hour.

[0061] (4) After centrifugation at a rotation speed of 4000 to 6000 r.p.m, the supernatant liquid is removed, and approximately the same amount of methanol is added.

[0062] (5) Stir the gel-like LaF 3 After the methanol solution completely became a suspension, it was stirred with an ultrasonic stirrer for more than 1 hour.

[0063] (6) The operations...

Embodiment 2

[0083] The solution prepared by the method shown in Example 1 was used as the treatment solution for forming the rare earth fluoride or alkaline earth metal fluoride coating film. In the X-ray diffraction pattern of the solution, the same diffraction peak as that of REnFm can hardly be seen, and the half-value width of the detected main diffraction peak is 2 to 10 degrees. This shows that the solution contains almost no solid phase with poor fluidity. Table 1 shows the half-value width of the gel used for each fluoride solution and the half-value width of the X-ray diffraction peak in the state coated on the NdFeB surface as it is. All the gels or coating films shown in the table have diffraction peaks larger than 1 degree and have patterns close to amorphous. In this example, as the magnetic powder for the rare earth magnet, a magnetic powder obtained by pulverizing a NdFeB-based amorphous ribbon produced by rapidly cooling a master alloy whose composition was adjusted was u...

Embodiment 3

[0098] For the formation treatment liquid of rare earth fluoride or alkaline earth metal fluoride coating film, adopt the CaF2 made by the method shown in embodiment 1 2 、LaF 3 solution. CaF 2 、LaF 3 The concentration of the solution is 150g / dm 3 . As the soft magnetic powder, iron powder with an average particle size of 60 μm, Fe-7% Si powder with 10 μm, Fe-50% Ni powder with 10 μm, Fe-50% Co powder with 30 μm, Fe-10% Si-5% with 20 μm Al powder, 20μm Fe-10%Si-10%B powder.

[0099]LaF is described below 3 Coating film forming process.

[0100] (1) Add 100mL of LaF to 1kg of soft magnetic powder 3 The coating film forming treatment liquid was mixed until it could be confirmed that all the magnetic powder for rare earth magnets was wetted.

[0101] (2) To the LaF of (1) under the reduced pressure of 2~5torr 3 Coating film formation treatment soft magnetic powder removes solvent methanol.

[0102] (3) the soft magnetic powder that has carried out the solvent removal of...

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Abstract

A conventional method for forming an insulating film on a magnet has a difficulty in achieving sufficient improvement in magnetic characteristics due to nonuniformity of a coating film, and an extended time and higher temperature which are required in a thermal treatment. In order to solve the problems, the present invention provides a treating solution composed of an alcohol based solvent and a rare earth fluoride or alkaline earth metal fluoride dispersing in the solvent. In the treating solution, at least one X-ray diffraction peak has a half-value width larger than 1 DEG . The present invention also provides a method for forming an insulating film using the treating solution.

Description

technical field [0001] The present invention relates to a treatment solution for forming a fluoride coating film on a magnetic body and a method for forming a fluoride coating film. Background technique [0002] In recent years, in order to improve the characteristics of magnets, a technique of forming a fluoride insulating film on the surface of a magnet has been developed. The following patent documents 1 to 5 are known as documents related to the formation of the insulating film. [0003] The following Patent Document 1 relates to forming a film mainly composed of crystalline or amorphous fluoride on the surface of NdFeB using a solution containing fluoride, fluoride or oxyfluoride (acid fluoride) formed by a reaction, etc. ) with a thickness of 1 to 100 nm, due to the layered shape, there are records of improving the magnetic properties such as an increase in the coercive force, a decrease in the temperature coefficient of the coercive force, and an increase in Hk, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/06H01F1/09B22F1/02
CPCH01F41/0293
Inventor 小室又洋佐通祐一森下芳伊舟生重昭片寄光雄
Owner HITACHI CHEM CO LTD
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