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 m

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

Examples

Experimental program
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Example Embodiment

[0018] Example 1:

[0019] 1. First, the nano SrCO 3 And Fe 2 O 3 The compounding is carried out according to the molar percentage of 1:5.9, and then the agate ball is used for ball milling in an ethanol environment 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-phase reaction. Air atmosphere is used for sintering, the final sintering temperature of high-temperature furnace isostatic pressing is 950℃~1200℃, and the heat preservation is 12 hours;

[0020] 2. The synthesized SrFe 12 O 19 The powder is ball-milled twice, and then the ball-milled powder is dried and sieved, and finally sintered by isostatic sintering. The sintering temperature is 950°C to 1050°C and the temperature is maintained for 2 hours. The maximum fracture toughness of the sample obtained at this time is 2.74;

[0021] On the basis of the above technical scheme, D3021, which acc...

Example Embodiment

[0022] Example 2:

[0023] 1. The Nano SrCO 3 And Fe 2 O 3 The compounding is carried out according to the molar percentage of 1:5.6, and then in an ethanol environment, the agate ball is used for ball milling 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-phase reaction. Air atmosphere is used for sintering, the final sintering temperature of high-temperature furnace isostatic pressing is 950℃~1200℃, and the temperature is kept for 12-13 hours.

[0024] 2. The synthesized SrFe 12 O 19 The powder is ball milled twice, and then the ball milled powder is dried and sieved. Finally, the method of isostatic pressing sintering is used for sintering, the highest sintering temperature is 1150℃, and the heat preservation is 2 hours. The maximum fracture toughness of the sample obtained at this time was 2.14.

[0025] On the basis of the above technical sch...

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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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