FeSiAl磁粉芯的制备工艺与软磁性能研究
发布时间：2019-06-28 15:27
【摘要】：FeSiAl磁粉芯具有价格低廉,软磁性能优异的特点,在电力行业中特别是开关电源技术上、滤波器、扼流器等电子元器件,具有广泛的应用。随着电子元器件向高频化、小型化、高功率化发展,对FeSiAl磁粉芯软磁性能提出更高的要求,但是FeSiAl磁粉芯高频下损耗高,易发热,限制了其在高频宽频下应用。FeSiAl磁粉芯的性能与粉末的状态,绝缘粘接,压制成型以及退火工艺密切相关,本论文针对FeSiAl磁粉芯存在的问题开展工作,通过探究粉末形貌和粒径配比,获取损耗最低的配比,在此基础上添加不同的包覆粘接材料,探究包覆粘接工艺对磁粉芯性能的影响;探究合适的成型和热处理工艺,获取最优的工艺参数,制备出低损耗、高磁导率、高品质因数的FeSiAl磁粉芯,并利用电子扫描显微镜、X射线衍射仪、软磁交流测量仪、PPMS等手段分析磁粉芯的性能,深入探究影响磁粉芯性能的机理。选取扁平状粉末与絮状粉末以及1:1混合粉末制备磁粉芯,研究表明扁平状粉末制备的磁粉芯具有较好的软磁性能,絮状粉末性能最差,两者混合粉末制备的磁粉芯性能处于两者之间;选取两种形貌的颗粒比值为1:2、1:1、2:1、3:1比例开展实验,发现随着扁平状粉末含量的增加,损耗降低,磁导率升高,磁粉芯软磁性能提升。利用扁平化粉末制备磁粉芯,选取120目、200目、300目、400目等单一粒径的扁平状粉末制备磁粉芯,研究发现粉末粒径越大,磁导率越高,损耗越高,500℃保温0.5h,粒径为120目的磁粉芯在f=65kHz,Bm=50mT条件下,损耗为80W/kg,磁导率为42.4,品质因数为8.7;选取120目和200目的粉末混合,在两者的比例为1:2时,磁粉芯具有最佳的软磁性能;选取120目、200目、300目粉末混合,在120目与200目两者的比例为1:2的基础上,添加300目粉末,研究发现磁粉芯损耗增加,磁导率下降,但是品质因数升高。粘接剂对磁粉芯的性能有很大影响,选取有机硅树脂、水玻璃、DC-805抗高温硅酮树脂作为粘接剂,研究发现DC-805抗高温硅酮树脂制备的磁粉芯,具有最佳的软磁性能,随着粘接剂含量的增加,磁粉芯损耗降低,品质因数升高,磁导率减小,粘接剂的含量为7%时,磁粉芯的品质因数较高。探究压制压力、保压时间和升压速度对磁粉芯的影响,在1200MPa压制压力下,磁粉芯的磁导率最高,损耗最低,磁粉芯磁导率随着压制压力的增加呈现先升高后下降,磁粉芯的损耗呈现先下降后上升的趋势,保压时间对磁粉芯性能没有较大影响。退火是磁粉芯获得优良软磁性能的有效手段,本论文通过选取300℃到800℃之间进行热处理,随着温度升高,磁导率增加趋势变大,在700℃左右退火时,磁粉芯磁导率达到最高,退火温度继续升高,磁导率下降;磁粉芯的损耗同时在下降,矫顽力在降低,磁粉芯在700℃退火后,f=65kHz,Bm=50mT条件下工作,损耗为14.6W/kg,品质因数为65,磁导率为90。研究发现随着测试温度的升高,磁粉芯的磁导率会降低,但变化幅度较小,表明FeSiAl磁粉芯具有恒磁导率。
[Abstract]:The FeSiAl magnetic powder core has the characteristics of low price and excellent soft magnetic performance, and is especially used in the power industry, such as the switch power supply technology, the filter, the choke and other electronic components, and has wide application. With the development of high frequency, miniaturization and high power of electronic components, the soft magnetic properties of the FeSiAl magnetic powder core are required to be higher, but the high frequency of the FeSiAl magnetic powder core is high, the heating is easy, and the application of the FeSiAl magnetic powder core in high frequency and wide frequency is limited. The performance of the FeSiAl magnetic powder core is closely related to the state of the powder, the insulation bonding, the press forming and the annealing process. The influence of the coating bonding process on the properties of the magnetic powder core was investigated, and the appropriate forming and heat treatment process was explored to obtain the optimal process parameters, and the FeSiAl magnetic powder core with low loss, high magnetic permeability and high quality factor was prepared. The performance of magnetic powder core was analyzed by means of electronic scanning microscope, X-ray diffractometer, soft magnetic AC measuring instrument and PPMS. A magnetic powder core was prepared by mixing a flat powder with a flocculent powder and a 1:1 mixed powder, and the magnetic powder core prepared by the flat powder has good soft magnetic properties, and the floc powder has the worst performance, and the performance of the magnetic powder core prepared by the mixed powder of the two powders is between the two; The particle ratio of the two kinds of morphology was 1:2,1:1,2:1 and 3:1, and it was found that with the increase of the content of the flat powder, the loss was reduced, the magnetic permeability was increased, and the soft magnetic properties of the magnetic powder core were improved. A magnetic powder core is prepared by using a flat powder with a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by using a flat powder of a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by the method, the higher the magnetic permeability is, the higher the loss is, the thermal insulation at 500 DEG C for 0.5 h, the magnetic powder core with the particle size of 120 meshes at the condition of f = 65 kHz, Bm = 50 mT, the loss is 80 W/ kg, the magnetic permeability is 42.4 and the quality factor is 8.7; the powder mixture of 120 meshes and 200 meshes is selected; when the ratio of the two is 1:2, the magnetic powder core has the best soft magnetic property;120-mesh,200-mesh and 300-mesh powder are mixed, and the proportion of the 120-mesh,200-mesh and 300-mesh powder is 1:2, and the 300-mesh powder is added, The study found that the magnetic particle core loss increased and the magnetic permeability decreased, but the quality factor increased. The adhesive has a great influence on the properties of the magnetic powder core, and the organic silicon resin, the water glass and the DC-805 high-temperature silicone resin are selected as the adhesive, the magnetic powder core prepared by the DC-805 high-temperature silicone resin is found, the magnetic powder core has the best soft magnetic property, the loss of the magnetic powder core is reduced with the increase of the content of the adhesive, The quality factor of the magnetic powder core is high when the quality factor is increased, the magnetic permeability is reduced, and the content of the adhesive is 7%. the influence of the pressing pressure, the pressure maintaining time and the step-up speed on the magnetic powder core is explored, the magnetic permeability of the magnetic powder core is the highest and the loss is the lowest under the pressing pressure of 1200 MPa, the magnetic permeability of the magnetic powder core is reduced after the increase of the pressing pressure, the loss of the magnetic powder core is reduced, The pressure holding time has no great influence on the performance of the magnetic powder core. The annealing is an effective method for obtaining the excellent soft magnetic properties of the magnetic powder core. The thermal treatment is carried out between 300 鈩，
本文编号：2507405
[Abstract]:The FeSiAl magnetic powder core has the characteristics of low price and excellent soft magnetic performance, and is especially used in the power industry, such as the switch power supply technology, the filter, the choke and other electronic components, and has wide application. With the development of high frequency, miniaturization and high power of electronic components, the soft magnetic properties of the FeSiAl magnetic powder core are required to be higher, but the high frequency of the FeSiAl magnetic powder core is high, the heating is easy, and the application of the FeSiAl magnetic powder core in high frequency and wide frequency is limited. The performance of the FeSiAl magnetic powder core is closely related to the state of the powder, the insulation bonding, the press forming and the annealing process. The influence of the coating bonding process on the properties of the magnetic powder core was investigated, and the appropriate forming and heat treatment process was explored to obtain the optimal process parameters, and the FeSiAl magnetic powder core with low loss, high magnetic permeability and high quality factor was prepared. The performance of magnetic powder core was analyzed by means of electronic scanning microscope, X-ray diffractometer, soft magnetic AC measuring instrument and PPMS. A magnetic powder core was prepared by mixing a flat powder with a flocculent powder and a 1:1 mixed powder, and the magnetic powder core prepared by the flat powder has good soft magnetic properties, and the floc powder has the worst performance, and the performance of the magnetic powder core prepared by the mixed powder of the two powders is between the two; The particle ratio of the two kinds of morphology was 1:2,1:1,2:1 and 3:1, and it was found that with the increase of the content of the flat powder, the loss was reduced, the magnetic permeability was increased, and the soft magnetic properties of the magnetic powder core were improved. A magnetic powder core is prepared by using a flat powder with a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by using a flat powder of a single particle size such as 120 mesh,200 mesh,300 mesh,400 mesh and the like. The magnetic powder core is prepared by the method, the higher the magnetic permeability is, the higher the loss is, the thermal insulation at 500 DEG C for 0.5 h, the magnetic powder core with the particle size of 120 meshes at the condition of f = 65 kHz, Bm = 50 mT, the loss is 80 W/ kg, the magnetic permeability is 42.4 and the quality factor is 8.7; the powder mixture of 120 meshes and 200 meshes is selected; when the ratio of the two is 1:2, the magnetic powder core has the best soft magnetic property;120-mesh,200-mesh and 300-mesh powder are mixed, and the proportion of the 120-mesh,200-mesh and 300-mesh powder is 1:2, and the 300-mesh powder is added, The study found that the magnetic particle core loss increased and the magnetic permeability decreased, but the quality factor increased. The adhesive has a great influence on the properties of the magnetic powder core, and the organic silicon resin, the water glass and the DC-805 high-temperature silicone resin are selected as the adhesive, the magnetic powder core prepared by the DC-805 high-temperature silicone resin is found, the magnetic powder core has the best soft magnetic property, the loss of the magnetic powder core is reduced with the increase of the content of the adhesive, The quality factor of the magnetic powder core is high when the quality factor is increased, the magnetic permeability is reduced, and the content of the adhesive is 7%. the influence of the pressing pressure, the pressure maintaining time and the step-up speed on the magnetic powder core is explored, the magnetic permeability of the magnetic powder core is the highest and the loss is the lowest under the pressing pressure of 1200 MPa, the magnetic permeability of the magnetic powder core is reduced after the increase of the pressing pressure, the loss of the magnetic powder core is reduced, The pressure holding time has no great influence on the performance of the magnetic powder core. The annealing is an effective method for obtaining the excellent soft magnetic properties of the magnetic powder core. The thermal treatment is carried out between 300 鈩，
本文编号：2507405
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