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High-performance permanent magnet ferrite with extremely-low Hcj temperature coefficient and preparation method thereof

A technology of permanent magnet ferrite and temperature coefficient, which is applied in the field of high-performance permanent magnet ferrite and its preparation, can solve the problems of low intrinsic coercive force temperature coefficient of ferrite, etc., and achieve stability promotion and full promotion The effect produced

Inactive Publication Date: 2017-12-08
ANHUI SINOMAG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a high-performance permanent magnet ferrite with an extremely low Hcj temperature coefficient and its Preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A high-performance permanent magnet ferrite with extremely low Hcj temperature coefficient, the main phase molecular formula is Sr 0.52 Ca 0.16 La 0.32 Fe 10.88 co 0.17 o 17.7 .

[0032] The preparation method of above-mentioned high-performance permanent magnet ferrite, comprises the steps:

[0033] (1) Ingredients

[0034] According to the main phase molecular formula Sr 0.52 Ca 0.16 La 0.32 Fe 10.88 co 0.17 o 17.7 The mol ratio, and considering the loss ratio, calculate the amount of raw material added, where:

[0035] Fe 2 o 3 Powder 1286.6g; SrCO 3 Powder 101g; CaCO 3 Powder 27.6g; La 2 o 3 Powder 90g; Co 2 o 3 Powder 25.3g; H 3 BO 3 Powder 1.5g; NH 4 HCO 3 Powder 2g; the average particle size of each ingredient is less than 8μm, and the purity is greater than 97%;

[0036] (2) Grinding

[0037] Add the weighed ingredients into the water ball mill, and carry out wet grinding for 1 hour. The mass ratio of ingredients, steel balls and water ...

Embodiment 2

[0047] Example 2: A high-performance permanent magnet ferrite with extremely low Hcj temperature coefficient, the main phase molecular formula is Sr 0.45 Ba 0.2 Bi 0.1 La 0.25 Fe 11 Zn 0.18 o 17.86 . The preparation method of above-mentioned high-performance permanent magnet ferrite, comprises the steps:

[0048] (1) Ingredients

[0049] According to the main phase molecular formula Sr 0.48 Ba 0.2 Bi 0.1 La 0.21 Fe 11 Zn 0.18 o 17.51 The mol ratio, and considering the loss ratio, calculate the amount of raw material added, where:

[0050] Fe2O3 powder 1225.6g; SrCO3 powder 92.7g; BaCO3 powder 55.1g; Bi2O3 powder 32.5g; La2O3 powder 56.8g; ZnO powder 20.4g; %;

[0051] (2) Grinding

[0052] Add the weighed ingredients into the water ball mill and carry out wet grinding for 1.5h. The mass ratio of ingredients, steel balls and water is 1:6:1.5;

[0053] (3) pre-burning

[0054] The ground raw materials are dehydrated and dried, and the moisture content after dr...

Embodiment 3

[0062] Example 3: A high-performance permanent magnet ferrite with extremely low Hcj temperature coefficient, the main phase molecular formula is Sr 0.59 Pb 0.06 Y 0.05 La 0.3 Fe 9.5 Ni 0.17 o 16.09 , the preparation method of above-mentioned high-performance permanent magnet ferrite, comprises the steps:

[0063] (1) Ingredients

[0064] According to the main phase molecular formula Sr 0.59 Pb 0.06 Y 0.05 La 0.3 Fe 9.8 Ni 0.17 o 16.09 The mol ratio, and considering the loss ratio, calculate the amount of raw material added, where:

[0065] Fe2O3 powder 1351.2g; SrCO3 powder 150.4g; PbO2 powder 26.6g; Y2O3 powder 9.7g; La2O3 powder 84.4g; NiO powder 21.9g; H3BO3 powder 0.5g; 8μm, the purity is greater than 97%;

[0066] (2) Grinding

[0067] Put the weighed ingredients into the sand mill and carry out wet grinding for 6 hours. The mass ratio of ingredients, steel balls and water is 1:13:2.5;

[0068] (3) pre-burning

[0069] The ground raw materials are dehyd...

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Abstract

The invention relates to high-performance permanent magnet ferrite with an extremely-low Hcj temperature coefficient. A main phase molecular formula is SrxAyB1-x-yFezCnOm, wherein A is one or more of elements Ca, Ba and Pb; B is one or more of elements La, Bi and Y; C is one or more of elements Co, Zn, Ni, Cd, Mn, Cu and Cr; x, y, z, n and m represent a molar ratio, and the value taking ranges are that x is more than or equal to 0.1 but less than or equal to 0.6, y is more than or equal to 0.05 but less than or equal to 0.5, n is more than or equal to 0 but less than or equal to 0.3, z is more than or equal to 9.0 but less than or equal to 12, and m is more than or equal to 0.15 but less than or equal to 19. The permanent magnet ferrite provided by the invention can achieve high performance and has low Hcj temperature coefficient. According to a preparation method of the high-performance permanent magnet ferrite with the extremely-low Hcj temperature coefficients, a primary additive contains boric acid and ammonium bicarbonate, can promote the full generation of an M phase of the permanent magnet ferrite and plays a great role in promoting the magnetic property and the stability of the low Hcj temperature coefficient.

Description

technical field [0001] The invention belongs to the technical field of high-performance permanent ferrite magnets, and in particular relates to a high-performance permanent ferrite with extremely low Hcj temperature coefficient and a preparation method thereof. Background technique [0002] Permanent ferrite magnets with M-shaped magnetic diamond structure are widely used in automobiles, household appliances, industrial automation and other industries. Among them, the high-performance magnets used in automobile motors or frequency conversion compressors are used in harsh conditions, often in outdoor conditions. At higher or lower temperatures (-50°C to 100°C), higher requirements are placed on the performance stability of the magnet, and a lower temperature coefficient is particularly important for maintaining the performance of the motor and preventing aging. [0003] At present, the magnetic properties of high-performance permanent magnet ferrite materials produced in Chin...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/622C04B35/63
CPCC04B35/2633C04B35/2641C04B35/622C04B35/6303C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3225C04B2235/3227C04B2235/3275C04B2235/3279C04B2235/3284C04B2235/3296C04B2235/3298C04B2235/3409
Inventor 姚志胜
Owner ANHUI SINOMAG TECH
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