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Process for producing permanent ferrite with high-fracture toughness property

A permanent magnet ferrite and fracture toughness technology, which is applied in the direction of magnetism of inorganic materials, can solve the problems of shortening the free path of crack propagation, increasing the safety hazard of magneto, and reducing the fracture toughness of materials, so as to achieve sufficient solid-phase reaction and improve magnetic properties. and mechanical properties, the effect of increasing density

Inactive Publication Date: 2009-07-29
沈阳矿山机械有限公司
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Problems solved by technology

Since the brittle fracture of this kind of fine-grained material is mostly intergranular fracture, when the grain is too large, the free path of crack propagation in the sample fracture will be greatly shortened, thereby reducing the fracture toughness of the material and affecting its mechanical properties.
In its subsequent processing, various defects such as brittle fracture and microcracks are prone to occur due to its poor machining performance, especially when it is used as the magnetic source material of the magneto, which increases the safety hazard of the magneto

Method used

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  • Process for producing permanent ferrite with high-fracture toughness property
  • Process for producing permanent ferrite with high-fracture toughness property
  • Process for producing permanent ferrite with high-fracture toughness property

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example 1

[0019] 1. First, the nano-SrCO 3 and Fe 2 o 3 Dosing is carried out according to the mole percentage of 1:5.9, and then ball milling is carried out with agate balls in an ethanol environment, so as to achieve the purpose of fully mixing and refining the raw material powder. Then the ball-milled raw materials are dried, sieved, and placed in a high-temperature furnace for solid-state reaction. Air atmosphere is used for sintering, and the final sintering temperature of isostatic pressure in high-temperature furnace is 950 ° C ~ 1200 ° C, and the temperature is kept for 12 hours;

[0020] 2. The synthesized SrFe 12 o 19 The powder is subjected to secondary ball milling, and then the milled powder is dried and sieved, and finally sintered by isostatic sintering at a sintering temperature of 950°C to 1050°C and kept for 2 hours. Obtain the maximum fracture toughness of sample at this moment to be 2.74;

[0021] On the basis of the above-mentioned technical scheme, D3021, whi...

Embodiment 2

[0023] 1. Nano-SrCO 3 and Fe 2 o 3 Dosing is carried out according to the molar percentage of 1:5.6, and then ball milling is carried out with agate balls in an ethanol environment, so as to achieve the purpose of fully mixing and refining the raw material powder. Then the ball-milled raw materials are dried, sieved, and placed in a high-temperature furnace for solid-state reaction. An air atmosphere is used during sintering, and the final sintering temperature of isostatic pressing in a high-temperature furnace is 950° C. to 1200° C., and the temperature is kept for 12 to 13 hours.

[0024] 2. The synthesized SrFe 12 o 19 The powder is subjected to secondary ball milling, and then the ball milled powder is dried and sieved. Finally, sintering is carried out by means of isostatic sintering, the highest sintering temperature is 1150° C., and the temperature is kept for 2 hours. At this time, the maximum fracture toughness of the sample obtained was 2.14.

[0025] On the ...

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Abstract

The invention provides a method for preparing permanent magnetic ferrite with high fracture toughness. The method comprises the steps of proportioning nanometer SrCO3 and Fe2O3 according to certain proportion, adopting ball milling to mix raw material powder well and refine the raw material powder again, drying and sieving the ball-milled raw material, placing the raw material in a high temperature furnace for solid phase reaction, performing secondary ball milling to synthetic SrFe12O19 powder, drying and sieving the ball-milled powder and adopting an isostatic pressing sintering method to combine molding and sintering into one. Strontium permanent magnetic ferrite prepared by the method has excellent mechanical properties, and can be applied in severe environments such as automobile starting motors, windscreen wiper motors, engine-cooling fan motors, and the like.

Description

technical field [0001] The invention relates to a preparation method of permanent magnet ferrite, in particular to a preparation method of permanent magnet ferrite with high fracture toughness. The permanent ferrite can be used in extremely harsh environments. Background technique [0002] At present, most of the permanent magnet ferrites sold in the market are synthesized by high-temperature solid-state reaction using micron-sized iron red and strontium carbonate as raw materials. This production process is similar to the production process of general ceramic products. Since the brittle fracture of this kind of fine-grained material is mostly intergranular fracture, when the grain size is too large, the crack propagation free path of the sample fracture will be greatly shortened, thereby reducing the fracture toughness of the material and affecting its mechanical properties. In the subsequent processing process, various defects such as brittle fracture and microcracks are ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622H01F1/11
Inventor 倪日亮冯泉于忠淇潘德强米世成张宪伟
Owner 沈阳矿山机械有限公司
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