CN102173768B - Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite - Google Patents
Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite Download PDFInfo
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- CN102173768B CN102173768B CN201110023993.0A CN201110023993A CN102173768B CN 102173768 B CN102173768 B CN 102173768B CN 201110023993 A CN201110023993 A CN 201110023993A CN 102173768 B CN102173768 B CN 102173768B
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- calcium stearate
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Abstract
The invention provides a preparation method of a high-performance radially isotropic dry pressing permanent magnetic ferrite. The method comprises the following steps: 1) preparing raw materials: selecting ultrafine magnetic powder as a main material as well as H3BO3, calcium stearate, camphor and alcohol solution as additives, preparing camphor and alcohol into a camphor solution at a ratio of 1:1.2, and adding the camphor solution, the calcium stearate and the H3BO3 into the magnetic powder evenly; 2) grinding and swelling the material prepared in the step 1); 3) pressing the material prepared in the step 2) to obtain a blank; 4) sintering the blank prepared in the step 3) at 1120-1180 DEG C; and 5) cleaning and polishing the product prepared in the step 4) to prepare the finished product. The residual magnetism Br of the permanent magnetic ferrite prepared by the method is 390+/-5mT, the coercivity Hcb is 235+/-5KA/m, the intrinsic coercivity Hcj is 240+/-5KA/m, and the magnetic energy product (BH) is 27+/-2KJ/m<3>; and the permanent magnetic ferrite has very high magnetic property and can be used for preparing pump bodies with higher requirements such as a permanent magnet synchronous motor and the like.
Description
Technical field
The present invention relates to the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of a kind of high-performance.
Background technology
The moulding process of permanent-magnet ferrite mainly contains two kinds of dry-pressing and wet pressings, wherein the properties of product of Wet-pressing molding are generally higher than dry-pressing formed product, but the shaping speed of product is slow, qualification rate is low, the dry-pressing formed production advantage will be higher than Wet-pressing molding, shaping speed is fast, qualification rate is high, is convenient to production small size and complex-shaped product.
At present, the magnetic property of dry-pressing product is generally not high, and general good dry-pressing material remanent magnetism is at 360-370mT, and HCJ is at 220KA/m-240KA/m.Dry-pressing product is mainly used in toy motor, and added value of product is not high, is not suitable for the pump housing class permanent-magnet synchronous small machine of having relatively high expectations.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art part, the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of a kind of high-performance is provided.
High-performance of the present invention is the manufacture method of isotropic dry pressing permanent-magnet ferrite radially, comprises the following steps:
1) raw material is prepared: taking thin magnetic as major ingredient, and select H
3bO
3, calcium stearate, camphor and alcoholic solution be as additive; Camphor and alcohol are made to camphor solution according to 1:1.2, by camphor solution, calcium stearate and H
3bO
3evenly add in magnetic;
2) material making in step 1) is pulverized expanded;
3) by step 2) in the material that makes be pressed into blank;
4) blank making in step 3) is carried out to sintering, sintering temperature is 1120-1180 DEG C;
5) product making in step 4) is cleaned to polishing, make finished product.
Preferably, in said magnetic, the addition of camphor solution is 1.2～3.0wt%, and the addition of calcium stearate is 2～3.8wt%, H
3bO
3addition be 0.3～0.65wt%.
In dry-pressing permanent-magnet ferrite preparation method, conventionally select camphor as adhesive, calcium stearate is as lubricant, directly camphor is added to magnetic, magnetic is difficult to even dispersion in magnetic, product after sintering can produce many pores, in the present invention, camphor and alcohol are mixed and made into camphor solution according to 1:1.2, add magnetic, solve the problem of pore, and the addition of camphor solution is larger on the impact of product remanent magnetism, in the time that the addition of camphor solution in magnetic is 1.2～3.0wt%, product remanent magnetism is higher.
In dry-pressing permanent-magnet ferrite preparation method, conventionally select camphor as lubricant, remanent magnetism and the coercive force of calcium stearate to product is of great impact, along with the increasing of addition, remanent magnetism is dull increase almost, HCJ can dullly decline, and in magnetic, the broiler diets of calcium stearate is 2～3.8wt%.
In dry-pressing permanent-magnet ferrite preparation method, H
3bO
3effect be in sintering process, to be decomposed into B
2o
3, form vitreum, contribute to sintering to carry out, disperse is simultaneously in permanent-magnet ferrite, weaken the movement of crystal boundary in sintering process, thereby controlled crystallite dimension, improved the coercive force of magnet, but excessive interpolation can be introduced too much nonmagnetics and sanction, and can reduce remanent magnetism, affects magnetic property.When sintering temperature is in magnetic 1120-1180 DEG C time, H
3bO
3broiler diets be 0.3～0.65wt%.
The permanent-magnet ferrite that utilizes method of the present invention to make, its remanent magnetism Br is 390 ± 5mT, and coercivity H b is 235KA/m ± 5KA/m, and HCJ Hcj is 240KA/m ± 5KA/m, and magnetic energy product (BH) is 27 ± 2KJ/m
3, there is very high magnetic property, can be used in and manufacture the pump housing that permagnetic synchronous motor etc. is had relatively high expectations.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
embodiment 1
In the present embodiment, the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of high-performance, comprises the following steps:
1) raw material is prepared: taking thin magnetic as major ingredient, and select H
3bO
3, calcium stearate, camphor and alcoholic solution be as additive; Camphor and alcohol are made to camphor solution according to 1:1.2, by camphor solution, calcium stearate and H
3bO
3evenly add in magnetic, in magnetic, the addition of camphor solution is 1.2wt%, and the addition of calcium stearate is 2wt%, H
3bO
3addition be 0.3wt%;
2) material making in step 1) is pulverized expanded;
3) by step 2) in the material that makes be pressed into blank;
4) blank making in step 3) is carried out to sintering, sintering temperature is 1120-1180 DEG C; 5) product making in step 4) is cleaned to polishing, make finished product.
embodiment 2
In the present embodiment, the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of high-performance, comprises the following steps:
1) raw material is prepared: taking thin magnetic as major ingredient, and select H
3bO
3, calcium stearate, camphor and alcoholic solution be as additive; Camphor and alcohol are made to camphor solution according to 1:1.2, by camphor solution, calcium stearate and H
3bO
3evenly add in magnetic, in magnetic, the addition of camphor solution is 2.2wt%, and the addition of calcium stearate is 3.0wt%, H
3bO
3addition be 0.45wt%;
2) material making in step 1) is pulverized expanded;
3) by step 2) in the material that makes be pressed into blank;
4) blank making in step 3) is carried out to sintering, sintering temperature is 1120-1180 DEG C;
5) product making in step 4) is cleaned to polishing, make finished product.
embodiment 3
In the present embodiment, the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of high-performance, comprises the following steps:
1) raw material is prepared: taking thin magnetic as major ingredient, and select H
3bO
3, calcium stearate, camphor and alcoholic solution be as additive; Camphor and alcohol are made to camphor solution according to 1:1.2, by camphor solution, calcium stearate and H
3bO
3evenly add in magnetic, in magnetic, the addition of camphor solution is 3.0wt%, and the addition of calcium stearate is 3.8wt%, H
3bO
3addition be 0.65wt%;
2) material making in step 1) is pulverized expanded;
3) by step 2) in the material that makes be pressed into blank;
4) blank making in step 3) is carried out to sintering, sintering temperature is 1120-1180 DEG C;
5) product making in step 4) is cleaned to polishing, make finished product.
embodiment 4
The permanent-magnet ferrite that embodiment 1-3 is made detects with MATS-2010H permanent magnetism tester, the finished product magnetic property that discovery is made is as follows: remanent magnetism Br is 390 ± 5mT, coercivity H b is 235KA/m ± 5KA/m, and HCJ Hcj is 240KA/m ± 5KA/m, and magnetic energy product (BH) is 27 ± 2KJ/m
3, reach the magnetic property level of pressed Anisotropic permanent-magnet ferrite, can be used in and manufacture the pump housing that permagnetic synchronous motor etc. is had relatively high expectations.
Claims (1)
1. the radially manufacture method of isotropic dry pressing permanent-magnet ferrite of high-performance, is characterized in that, comprises the following steps:
1) raw material is prepared: taking thin magnetic as major ingredient, and select H
3bO
3, calcium stearate, camphor and alcoholic solution be as additive; Camphor and alcohol are made to camphor solution according to 1:1.2, by camphor solution, calcium stearate and H
3bO
3evenly add in magnetic;
2) material making in step 1) is pulverized expanded;
3) by step 2) in the material that makes be pressed into blank;
4) blank making in step 3) is carried out to sintering, sintering temperature is 1120-1180 DEG C;
5) product making in step 4) is cleaned to polishing, make finished product;
Wherein, in magnetic, the addition of camphor solution is 2.2wt%, and the addition of calcium stearate is 3.0wt%, H
3bO
3addition be 0.45wt%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110023993.0A CN102173768B (en) | 2011-01-21 | 2011-01-21 | Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite |
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|---|---|---|---|
| CN201110023993.0A CN102173768B (en) | 2011-01-21 | 2011-01-21 | Preparation method of high-performance radially isotropic dry pressing permanent magnetic ferrite |
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| CN102173768A CN102173768A (en) | 2011-09-07 |
| CN102173768B true CN102173768B (en) | 2014-07-02 |
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Families Citing this family (5)
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|---|---|---|---|---|
| CN102843002B (en) * | 2012-09-24 | 2015-10-28 | 徐州通用高新磁电有限公司 | A kind of manufacture method of permanent magnet machine rotor |
| CN102976767B (en) * | 2012-12-17 | 2014-08-06 | 南通万宝实业有限公司 | Method for selecting dry-pressed strontium permanent ferrite binding agent without loss of coercive force |
| CN104496458A (en) * | 2014-09-22 | 2015-04-08 | 横店集团东磁股份有限公司 | Manufacturing method of dry-pressed anisotropic ferrite magnetic powder |
| CN105693228A (en) * | 2016-02-04 | 2016-06-22 | 海安县巨力磁材有限责任公司 | Preparation method of high-performance radial-anisotropy dry-pressing permanent magnetic ferrite |
| CN107200569A (en) * | 2017-04-11 | 2017-09-26 | 江门市中磁机电有限公司 | A kind of high-performance dry-pressing permanent-magnet ferrite rotor and its manufacture method |
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| CN101599333B (en) * | 2009-04-28 | 2011-09-07 | 横店集团东磁股份有限公司 | Method for manufacturing anisotropic multi-pole magnetic ring through dry-press forming |
| CN101752075A (en) * | 2010-02-20 | 2010-06-23 | 南通万宝磁石制造有限公司 | Experimental method for determining use and addition amount of dry Sr ferrite magnetic steel adhesive agents |
| CN101870579A (en) * | 2010-06-10 | 2010-10-27 | 上海应用技术学院 | Permanently magnetic strontium ferrite material and preparation method thereof |
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Inventor after: Cao Jianjun Inventor after: Wang Zhaoyu Inventor after: Ding Xi Inventor before: Cao Jianjun |
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