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Ferrimagnetic material and its preparation method

A ferrimagnetic and powder technology, which is applied in the field of ferrimagnetic materials and their preparation, can solve the problems of limited production and difficult realization, and achieve the effects of easy realization, low cost and simple sintering method

Inactive Publication Date: 2016-06-01
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In fact, the temperature of 1000°C is easy to achieve, but the high pressure of 15GPa is not easy to achieve in industry and laboratory, which greatly limits its production.

Method used

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  • Ferrimagnetic material and its preparation method
  • Ferrimagnetic material and its preparation method
  • Ferrimagnetic material and its preparation method

Examples

Experimental program
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Effect test

preparation example Construction

[0022] The preparation method with ferrimagnetic material of the present embodiment includes:

[0023] Offer Al 2 o 3 powder, CuO powder and Fe 2 o 3 powder;

[0024] the Al 2 o 3 powder, CuO powder and Fe 2 o 3 The powders are mixed in a predetermined ratio, wherein the stoichiometric molar ratio Al: Cu: Fe = 1:3:4;

[0025] After the mixed powder is ground for a predetermined time, the ground powder is sintered in the atmospheric pressure air atmosphere at a temperature range of 700-900°C to form AlCu with ferrimagnetism. 3 Fe 4 o 12 .

[0026] in,

[0027] The Al 2 o 3 The particle size of the powder is: 300-500 mesh, the particle size of the CuO powder is: 200-400 mesh, the Fe 2 o 3 The particle size of the powder is: 200-400 mesh. But not limited to the particle sizes listed above.

[0028] The grinding time is greater than or equal to 2 hours.

[0029] The sintering time is greater than or equal to 2 hours, and the sintering time can be selected to be ...

example 1

[0033] Example 1--preparation of ceramic AlCu 3 Fe 4 o 12

[0034] Powdered Al 2 o 3 , CuO and Fe 2 o 3 Weigh the raw materials according to the stoichiometric molar ratio Al: Cu: Fe = 1: 3: 4; then put the three kinds of powders into the mortar and grind for 2 hours, and press them under the pressure of 200 MPa in a uniaxial direction tablet press to form a diameter of 10 mm and a height of 10 mm. 10mm cylinder. In an air atmosphere furnace, sinter at 700°C for 8 hours, and then cool down to room temperature naturally in the air.

[0035] For the phase analysis of the XRD pattern corresponding to the product, see figure 1 , figure 1 The XRD results show the formation of pure cubic AlCu 3 Fe 4 o 12 (There are no impurity phases and starting material peaks in XRD).

example 2

[0036] Example 2--preparation of ceramic AlCu 3 Fe 4 o 12

[0037] The difference from Example 1 is that the sintering temperature is 800°C and the sintering time is 6h. For the phase analysis of the XRD pattern corresponding to the product, see figure 2 , figure 2 The XRD results show the formation of pure cubic AlCu 3 Fe 4 o 12 (There are no impurity phases and starting material peaks in XRD).

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Abstract

The invention provides a material having ferrimagnetism and a preparation method thereof. The preparation method comprises the following steps of providing Al2O3 powder, CuO powder and Fe2O3 powder, mixing the Al2O3 powder, CuO powder and Fe2O3 powder according to a preset ratio, wherein a stoichiometric mole ratio of Al: Cu: Fe is 1: 3: 4, grinding the mixed powder for preset time, and sintering the powder at a temperature of 700-900 DEG C under normal pressure in an air atmosphere to obtain AlCu3Fe4O12 having ferrimagnetism. The preparation method utilizes a solid phase method to realize sintering of the powder in air under normal pressure, has simple processes and a low cost and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and in particular relates to a ferrimagnetic material and a preparation method thereof. Background technique [0002] Magnetic materials can generally be divided into five categories, namely paramagnetic materials, diamagnetic materials, antiferromagnetic materials, ferromagnetic materials and ferrimagnetic materials. For ferrimagnetic materials, as long as they can be magnetized to saturation under the action of a small magnetic field, not only the magnetic susceptibility χ d >0, and the value is as large as 10 1 ~10 3 The relationship between the magnetization M and the magnetic field H is a nonlinear complex function relationship, and hysteresis occurs when the magnetization is repeated. [0003] After the external field is withdrawn, the ferrimagnetic material will quickly eliminate its magnetism, and it has a wide range of uses in electromagnetic components. Currently r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 袁保合徐启单雯雯王玉生罗世钧
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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