• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention is divided into high residual magnetic flux density products, high residual magnetic flux density / coercive force products, and high coercive force products according to the application, and each of the three coarse pulverized powders is systematically prepared under different manufacturing conditions to suit the application product. To provide a method of producing permanent magnets. According to the method of the present invention, there is an effect of improving the magnetic properties, reducing the dispersion of the magnetic properties, and reducing the raw material cost. In the present invention, Sr-ferrite coarsely pulverized powder is produced by dividing into appropriate manufacturing conditions according to the molar ratio of iron oxide and strontium carbonate, the simple magnetic force management range of the clinker during the calcination process, and the type and content of the plasticizer. do.
    公开号:KR19980055658A
    申请号:KR1019960074892
    申请日:1996-12-28
    公开日:1998-09-25
    发明作者:조태식；이재옥；남창수；문동만；최하춘；이정환
    申请人:우덕창；쌍용양회공업 주식회사；
    IPC主号:
    专利说明:

    Manufacturing method of high characteristic anisotropic Sr-ferrite permanent magnet
    The present invention provides a high-performance Sr-ferrite permanent magnet for the purpose of improving the magnetic properties, reducing the dispersion of magnetic properties, and reducing the raw material cost by systemizing coarse powder of Sr-ferrite to suit the magnetic properties of each product and material. It relates to a manufacturing method of.
    In the present invention, three types of high residual magnetic flux density (Br) products, high residual magnetic flux density (Br) / coercive force (iHc) products, and high coercive force (iHc) products are classified according to the application of Sr-ferrite. It is characterized in that the coarsely pulverized powder is prepared under different production conditions.
    In the present invention, Sr-ferrite coarsely pulverized powder is divided into three types according to the molar ratio of iron oxide (Fe 2 O 3 ) and strontium carbonate (SrCO 3 ), the simple magnetic force of the clinker during the plasticizing process, and the type and content of the plasticizer High-quality Sr-ferrite permanent magnets are manufactured under suitable manufacturing conditions.
    Sr- general anisotropic ferrite production process of the permanent magnet is in the main raw material of iron oxide and the additives carbon scan process, approximately 1100 to 1300 ℃ temperature range to uniformly mix the strontium ferrite formation in an appropriate molar ratio Sr- (SrO · 6Fe 2 O 3 Reaction process calcining process, coarse pulverization / grinding process to crush the calcined clinker to the size of 0.6 to 12 μm, forming process in the magnetic field, sintering process in the temperature range of about 1150 to 1250 ℃, and processing the sintered body into the final product The process is largely divided into.
    Anisotropic Sr-ferrite permanent magnets can be classified into three types according to their magnetic properties: high Br products, high iHc products, and general products of high Br / high iHc. The magnetic properties of the highly characteristic anisotropic Sr-ferrite permanent magnet are shown in Table 1 according to the application.
    TABLE 1

    High Br products have the disadvantage of being easily potato because they have relatively low iHc as Br is high, but they are ferrite permanent magnets that are applied to A.C generators, microwave oven magnetrons, and speaker sound equipment.
    High-Br / high iHc products are general-purpose general purpose materials, which are high in Br and iHc, and are ferrite permanent magnets applied to general motors and various sensors with little concern for potatoes.
    High iHc products are relatively low in Br but have high iHc, so ferrite permanent magnets are applied to starters and radiator coolants in automobiles where there is a potato problem due to a large starting current.
    Conventionally, one type of Sr-ferrite coarse pulverized powder has produced high Br products, high Br / high iC products, and high iHc products having various magnetic properties, which makes it difficult to improve the magnetic properties and reduce the magnetic property distribution. The use of expensive sintering aids, such as cobalt oxide and chromium oxide, was inevitable.
    The magnetic properties of Sr-ferrite coarse crushed powder are one of the important factors affecting the product characteristics of Sr-ferrite coarse powder, and it is important to develop a technology for systematically classifying and producing appropriate coarse pulverized powder according to the application of the applied material.
    The present invention is divided into high Br products, high Br / iHc products, high iHc products according to the application, and apply three kinds of coarsely pulverized powder, respectively, and to improve the magnetic properties by systemizing to different manufacturing conditions appropriately for each product, SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a highly characteristic anisotropic Sr-ferrite permanent magnet characterized by a reduction in dispersion of magnetic properties and a reduction in raw material cost.
    The present invention relates to a technology for systematically producing Sr-ferrite coarse crushed powder into three types according to the product use in the production of Sr-ferrite permanent magnets, and the molar ratio of housewife raw material iron oxide and strontium carbonate, during the plasticizing process The Klinger's simple magnetic management range will be differentiated, and the type and content of plasticizers will be changed accordingly.
    Klinker's simple magnetic force sets the scope of management as the iHc of the applied product gets higher. In addition, the molar ratio of housewife raw materials can be reduced by increasing the unreacted iron oxide due to the plasticity at low temperatures, the higher the magnetic force of the Klingka, so that the molar ratio is reduced substantially to improve this effect.
    Developed anisotropic Sr-ferrite coarse powder for each use is shown in Table 2 below.
    TABLE 2
    As an embodiment of the present invention, the specific manufacturing conditions of coarse pulverized powder suitable for the high residual magnetic flux density Sr-ferrite permanent magnet product melted for a magnetron of a microwave oven, an acoustic device of a speaker, and the like are as follows.
    The constituent ratio of the plastic raw material is 5.8M to 6.2M, the molar ratio of iron oxide and strontium carbonate, 0.10 to 0.50 parts by weight based on the iron oxide, plastic preparation boric acid is 0.01 to 0.20 parts by weight based on the iron oxide It is done.
    In addition, the control range of the clinker in the calcination process is applied in the range of 2800 to 3300 Oe, which is 200 to 500 Oe higher than iHc, a magnetic property of high Br products. Since iHc is reduced by Sr-ferrite coarsely pulverized finely divided to the target particle size, 30 to 40% of the particles are grown on the basis of fineness during the sintering process, the magnetic force during the sintering process is managed upward. The experimental results (n = 20) regarding the simple magnetic force of the Clinker and the iHc of the product are shown in Table 3 below.
    TABLE 3
    As a second embodiment of the present invention, the general materials used for general motors and various sensors are specific manufacturing conditions of coarse pulverized powder suitable for Sr-ferrite permanent magnet products having high Br / high iHc.
    The composition ratio of the raw material of the plastic raw material is a molar ratio of iron oxide and strontium carbonate is 5.7M to 6.1M, the calcined silica is 0.20 to 0.60 parts by weight based on iron oxide, the calcined boric acid is 0.01 to 0.20 parts by weight based on iron oxide It is done.
    In addition, the control range of the clinker in the calcination process is applied in the range of 3300 to 3800 Oe, which is 200 to 500 Oe higher than the high iHc, which is a magnetic property of the high Br / iHc product, and the experimental examples are shown in Table 3. Therefore, due to the present invention, the magnetic properties, in particular, the improvement and dispersion of the coercive force are reduced, and the strength of the material can be improved by not using or reducing alumina as the sintering aid. It is possible to reduce manufacturing costs by not using or reducing chromium oxide.
    As a third embodiment of the present invention, the specific manufacturing conditions of the coarse pulverized powder suitable for Sr-ferrite permanent magnet products having a high coercive force, which is a special motor material used for the starter of the vehicle is as follows.
    The composition ratio of the raw material of the plastic material is 5.6M to 6.0M, the molar ratio of iron oxide and strontium carbonate, 0.10 to 0.50 parts by weight based on the iron oxide, plasticizer, 0.01 to 0.20 parts by weight based on the iron oxide, plasticizer Alumina is characterized in that consisting of 0.20 to 2.0 parts by weight based on iron oxide.
    In addition, the control range of the clinker in the calcination process is applied in the range of 3800 to 4300 Oe because there may be plastic unreacted at a high simple force of more than 4200 Oe. In products requiring very high coercive force, sintering aids for improving coercive force are used to control magnetic properties.
    Accordingly, the present invention improves the magnetic properties, reduces the dispersion of the magnetic properties, and can reduce manufacturing costs by not using or reducing expensive cobalt oxide or chromium oxide as a sintering aid in high-quality materials.
    The present invention will be described in more detail based on the following various examples, which are not intended to limit the following examples of the present invention.
    Example 1
    It was applied to mass production of Sr-ferrite permanent magnet for magnetron of microwave oven, which has high residual magnetic flux density product. The specifications of SSM-450, a Sr-ferrite magnet material for a microwave oven in a microwave oven, were Br ≧ 4200G, bHc ≧ 2500Oe, iHc ≧ 2600Oe, and (BH) max ≧ 4.2 MGOe. An example of the manufacturing conditions of the permanent magnet for magnetron to which the coarse grinding powder for high Br in the present invention is applied is shown in Table 4 below.
    TABLE 4
    Table 5 shows the results of analyzing the magnetic properties of the magnetron permanent magnet of the microwave oven mass-produced under the above manufacturing conditions.
    TABLE 5
    As shown in Table 5 above, the target property was stably expressed in the Sr-ferrite permanent magnet for the magnetron, and the process stability was improved by reducing the magnetic property scattering.
    Example 2
    It was applied to mass production of Sr-ferrite permanent magnets for general motors, which are high Br / iHc products. The specification of SSM-390, which is a material of general motor Sr-ferrite magnet, is Br≥3950G, bHc≥3100Oe, iHc≥3200Oe, (BH) max≥3.7MGOe, but in the present invention, high Br / high iHc coarse powder is applied. An example of the manufacturing conditions of the permanent magnet for a general motor is shown in Table 6.
    TABLE 6
    Table 7 shows the results of analyzing the magnetic characteristics of the permanent magnet for general motors applied in the production conditions above.
    TABLE 7
    As shown in Table 7 above, the target characteristics were stably expressed in the Sr-ferrite permanent magnet for general motors, and the process stability was improved by reducing the magnetic characteristic scattering.
    Example 3
    It was applied to mass production of Sr-ferrite permanent magnet for starter of automobile which is high iHc product. The specification of SSM-330, which is a material of Sr-ferrite magnet for starter, is Br≥3550G, bHc≥3400Oe, iHc≥4700Oe, (BH) max≥3.1MGOe, but for starter to which coarse grinding powder for high iHc in the present invention is applied. An example of the manufacturing conditions of the permanent magnet is shown in Table 8.
    TABLE 8
    Table 9 shows the results of analyzing the magnetic properties of the starter permanent magnet mass-produced under the above manufacturing conditions.
    TABLE 9
    As shown in Table 9 above, the target characteristic was stably expressed in the starter Sr-ferrite permanent magnet, and process stability was improved by decreasing the magnetic characteristic scattering.
    According to the method of the present invention, the improvement of the magnetic properties, in particular the coercive force and the dispersion of the magnetic properties is reduced, and the manufacturing cost is reduced by manufacturing without or using expensive cobalt oxide or chromium oxide as the sintering aid as a sintering aid, It can also improve the strength of, and can reduce the manufacturing cost.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] The composition ratio of the coarsely pulverized plastic raw material suitable for Sr-ferrite of high residual magnetic flux density is from 5.8 M to 6.2 M in terms of molar ratio of iron oxide and strontium carbonate, and 0.10 to 0.50 parts by weight based on iron oxide, and calcined boric acid. It is made of 0.01 to 0.20 parts by weight based on the iron oxide, and the management range of the clinker in the calcining process is characterized in that 2800 to 3300 Oe characterized in that the manufacturing method of Sr-ferrite permanent magnet.
    [2" claim-type="Currently amended] The composition ratio of the coarsely pulverized plastic raw material suitable for Sr-ferrite of high residual magnetic flux density / high coercive force is in the molar ratio of iron oxide and strontium carbonate of 5.7M to 6.1M, and the calcined silica is 0.20 to 0.60 parts by weight based on iron oxide, Plasticizing aid Boric acid is 0.01 to 0.20 parts by weight based on iron oxide, the control range of the clinker in the calcining process is characterized in that the manufacturing method of Sr-ferrite permanent magnets characterized in that 3300 to 3800 Oe.
    [3" claim-type="Currently amended] The composition ratio of the coarsely pulverized plastic raw material suitable for Sr-ferrite of high coercive force is 5.6 to 6.0 M, and the molar ratio of iron oxide and strontium carbonate is 0.10 to 0.50 parts by weight based on iron oxide, and the plastic aid is boric acid. 0.01 to 0.20 parts by weight, plastic preparation alumina is composed of 0.30 to 2.0 middle part based on the iron oxide, the control range of the clinker in the calcination process is characterized in that 3800 to 4300 Oe manufacturing method of Sr-ferrite permanent magnet.
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    同族专利:
    公开号 | 公开日
    KR100215138B1|1999-08-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-28|Application filed by 우덕창, 쌍용양회공업 주식회사
    1996-12-28|Priority to KR1019960074892A
    1998-09-25|Publication of KR19980055658A
    1999-08-16|Application granted
    1999-08-16|Publication of KR100215138B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960074892A|KR100215138B1|1996-12-28|1996-12-28|Process for preparing an anisotropic sr-ferrite permanent magnet having excellent properties|
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