CN107129291A - 具有高频低温度系数低损耗MnZn软磁铁氧体材料及其制备方法 - Google Patents
具有高频低温度系数低损耗MnZn软磁铁氧体材料及其制备方法 Download PDFInfo
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- CN107129291A CN107129291A CN201710453159.2A CN201710453159A CN107129291A CN 107129291 A CN107129291 A CN 107129291A CN 201710453159 A CN201710453159 A CN 201710453159A CN 107129291 A CN107129291 A CN 107129291A
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- ball milling
- accessory ingredient
- soft magnetic
- powder
- magnetic ferrite
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000000498 ball milling Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 30
- 238000005245 sintering Methods 0.000 claims abstract description 26
- 238000005469 granulation Methods 0.000 claims abstract description 10
- 230000003179 granulation Effects 0.000 claims abstract description 10
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000004615 ingredient Substances 0.000 claims description 63
- 239000000843 powder Substances 0.000 claims description 47
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
- 230000005291 magnetic effect Effects 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 20
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 16
- 229910052681 coesite Inorganic materials 0.000 claims description 16
- 229910052906 cristobalite Inorganic materials 0.000 claims description 16
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 229910052682 stishovite Inorganic materials 0.000 claims description 16
- 229910052905 tridymite Inorganic materials 0.000 claims description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 14
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 claims description 14
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 14
- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical compound O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 claims description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 12
- 230000035699 permeability Effects 0.000 claims description 12
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 208000036366 Sensation of pressure Diseases 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 239000008187 granular material Substances 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 6
- UBEWDCMIDFGDOO-UHFFFAOYSA-N cobalt(II,III) oxide Inorganic materials [O-2].[O-2].[O-2].[O-2].[Co+2].[Co+3].[Co+3] UBEWDCMIDFGDOO-UHFFFAOYSA-N 0.000 claims description 6
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 claims description 6
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 claims description 4
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 claims description 4
- 239000011236 particulate material Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 10
- 239000002131 composite material Substances 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 18
- 230000006698 induction Effects 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 238000007873 sieving Methods 0.000 description 6
- 230000005294 ferromagnetic effect Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 230000001771 impaired effect Effects 0.000 description 4
- 239000000696 magnetic material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 1
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- WJZHMLNIAZSFDO-UHFFFAOYSA-N manganese zinc Chemical compound [Mn].[Zn] WJZHMLNIAZSFDO-UHFFFAOYSA-N 0.000 description 1
- 230000009972 noncorrosive effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明公开了一种具有高频低温度系数低损耗MnZn软磁铁氧体材料及其制备方法,该材料以Fe2O3:68wt%~72wt%、ZnO:5wt%~9wt%、MnO:余量为主成分,通过一次球磨、一次烧结、二次配料、二次球磨、造粒、压制成型、二次烧结等步骤制备而成。本发明的创新性在于通过合适的成分配比,离子复合掺杂与替代和材料制备技术,形成了无畴壁结构,抑制了畴壁共振,得到的MnZn功率铁氧体最高可以在5MHz的频率下工作,且该材料具有较高温度稳定性和较低功率损耗。
Description
技术领域
本发明涉及一种具有高频低温度系数低损耗MnZn软磁铁氧体材料及其制备方法,属于磁性材料技术领域。
背景技术
软磁铁氧体作为一种重要的元器件材料,主要制成磁心用于各种电感器、变压器、滤波器和扼流圈的制造,广泛应用在现代电力及电子信息等领域,如电脑及其外部设备、办公自动化设备、数字通信和模拟通信设备、互联网、家用电器、电磁兼容设备、绿色照明装置、工业自动化和汽车、航空、航天及军事领域。相对于其他软磁材料,软磁铁氧体的优势在于电阻率相对较高,这抑制了涡流的产生,使铁氧体能应用于高频领域;采用陶瓷工艺易于制成各种不同的形状和尺寸;化学特性稳定、不生锈;较低的制造成本。
随着工业与科学技术的不断进步,保证优异磁性能的同时,电子元器件在更加趋于高频化,小型化,要求更低的工作损耗,更宽的使用温度范围。因此,通过不同的技术来开发高频低损耗的软磁铁氧体磁芯具有重要的实际意义。现有的MnZn软磁铁氧体材料工作频率一般在1MHz以下,如中国专利(CN104446409A)中所制备的MnZn铁氧体只适合于工作在0.1~1MHz的频率下,中国专利(CN103833344A)中所制备的锰锌功率铁氧体可在2MHz及以下工作频率下使用,少数MnZn铁氧体材料工作频率可以达到3MHz,但是其磁导率,工作温度范围以及功率损耗等性能相对较差。因此,通过不同的技术来开发应用在1~5MH的高频低温度系数低损耗的软磁铁氧体磁芯具有重要的实际意义。
发明内容
本发明的目的在于提供一种能够在1~5MHz工作条件下使用的高频低温度系数低损耗MnZn软磁铁氧体材料及其制备方法。
为实现上述目的,本发明采用的方案如下:
具有高频低温度系数低损耗MnZn软磁铁氧体材料的制备方法包括如下步骤:
(1)一次配料
称取主成分,主成分组成如下:Fe2O3:68wt%~72wt%、ZnO:5wt%~9wt%、MnO:余量;
(2)一次球磨
将主成分均匀混合,将所称取的主成分放入球磨机,球磨3~10h,得到一次球磨粉料;
(3)一次烧结
将第一次球磨所得的粉料在空气气氛下以200~300℃/h的速度升温到800~1000℃,保温1~3h,随炉冷却得到一次烧结粉料;
(4)二次配料
在一次烧结粉料中添加下述三类副成分,其中,第一类副成分包括SiO2、CaO、CaCO3、Li2O、Al2O3中的一种或多种,第二类副成分包括V2O5、CuO、TiO2、Bi2O3、WO3、Nb2O5、MoO3中的一种或多种,第三类副成分包括SnO2、CoO、Co3O4、Co2O3,ZrO2、In2O3、Ta2O5中的一种或多种,三类副成分的添加总量不超过一次烧结粉料的3wt%;
(5)二次球磨
将二次配料后得到的粉料均匀混合后放入球磨机,球磨3~10h,得到二次球磨粉料;
(6)造粒
根据二次球磨后的粉料总重量,加入聚乙烯醇水溶液,其中聚乙烯醇的加入量为粉料总质量的3wt%~10wt%,先预压之后研磨过筛成颗粒;
(7)压制成型
向造粒所得的颗粒料中添加聚乙烯醇水溶液,其中聚乙烯醇的加入量为颗粒料总质量的3wt%~10wt%,压制成型为生坯产品,生坯密度要达到2.6~3.6g/cm3;
(8)二次烧结
烧结温度为1200~1400℃,保温2~14h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
优选的,:按主成分总重量计,三类副成分中各成分被选择作为添加成分时,各自的添加量如下:
第一类副成分:SiO2:500~2000ppm,CaO:1000~4000ppm,CaCO3:1500~5000ppm,Li2O:500~1000ppm,Al2O3:1000~2000ppm,
第二类副成分:V2O5:500~1500ppm,CuO:500~2000ppm,TiO2:500~2500ppm,Bi2O3:500~3500ppm,WO3:400~1000ppm,Nb2O5:2000~4000ppm,MoO3:400~1000ppm,
第三类副成分:SnO2:500~1500ppm,CoO:400~1200ppm,Co3O4:400~1200ppm,Co2O3:400~1500ppm,ZrO2:200~500ppm,In2O3:500~2000ppm,Ta2O5:200~1000ppm。
即当选择SiO2单独作为第一类副成分时,其添加量按主成分总重量计为500~2000ppm;当选择SiO2和CaO共同作为第一类副成分时,SiO2添加量按主成分总重量计仍为500~2000ppm,CaO的添加量按主成分总重量计1000~4000ppm;其它组分的添加量同理。
所述方法制备得到的具有高频低温度系数低损耗MnZn软磁铁氧体材料形成了无畴壁结构,在100℃,1MHz,50mT的工作条件下,功率损耗低于150kW m-3,在100℃,3MHz,10mT的工作条件下,功率损耗低于150kW m-3,在100℃,3MHz,30mT工作条件下,功率损耗低于500kW m-3,在100℃,5MHz,10mT的工作条件下,功率损耗低于500kW m-3,初始磁导率高于500,在工作温度范围内,功率损耗随温度变化不超过50%,磁导率随温度的变化不超过20%。
本发明的有益效果是:
对于广泛应用于各种元器件的高频MnZn铁氧体材料,通常希望其能在更宽的温度范围内具有很低的功率损耗,本发明通过在二次配料中添加三种不同类型的副成分,以及在烧结工艺上的合理控制,得到了在1~5MHz的高频条件下适用温度范围大于150℃且各性能参数的温度稳定性较好,较低功率损耗的软磁MnZn铁氧体材料。
具体实施方式
下面通过具体的实施案例,对本发明所制备的MnZn铁氧体材料及制备工艺进一步具体说明。
实施案例1:
选用的主成分的含量以氧化物计为:Fe2O3:71.2wt%、ZnO:5.82wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入按主成分的总量计的副成分,副成分含量以氧化物计算为第一类副成分:SiO2:500ppm,CaO:1500ppm,第二类副成分:V2O5:1000ppm,Nb2O5:3000ppm,第三类副成分:SnO2:1000ppm,CoO:500ppm,并加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
实施案例1制备得到的MnZn软磁铁氧体材料的初始磁导率为650,其25℃时的饱和磁感应强度为520mT,100℃时的饱和磁感应强度为430mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为150kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为480kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为500kW m-3,在150℃下,磁导率未出现明显下降。
实施案例2:
选用的主成分的含量以氧化物计为:Fe2O3:71.64wt%、ZnO:5.46wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入按主成分的总量计的副成分,副成分含量以氧化物计算为第一类副成分:SiO2:1000ppm,CaCO3:2000ppm,第二类副成分:TiO2:2000ppm,MoO3:500ppm,第三类副成分:Co3O4:800ppm,ZrO2:300ppm,并加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
实施案例2制备得到的MnZn软磁铁氧体材料的初始磁导率为600,其25℃时的饱和磁感应强度为510mT,100℃时的饱和磁感应强度为420mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为146kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为500kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为496kW m-3,在150℃下,磁导率未出现明显下降。
实施案例3:
选用的主成分的含量以氧化物计为:Fe2O3:71.2wt%、ZnO:5.82wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入按主成分的总量计的副成分,副成分含量以氧化物计算为第一类副成分:SiO2:500ppm,,Al2O3:1000ppm,第二类副成分:Bi2O3:1500ppm,WO3:500ppm,第三类副成分:Co2O3:1000ppm,In2O3:1000ppm,并加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
实施案例3制备得到的MnZn软磁铁氧体材料的初始磁导率为650,其25℃时的饱和磁感应强度为510mT,100℃时的饱和磁感应强度为420mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为148kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为486kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为478kW m-3,在150℃下,磁导率未出现明显下降。
实施案例4:
选用的主成分的含量以氧化物计为:Fe2O3:71.64wt%、ZnO:5.46wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入按主成分的总量计的副成分,副成分含量以氧化物计算为第一类副成分:CaO:1500ppm,Al2O3:1500ppm,第二类副成分:CuO:1000ppm,TiO2:2000ppm,第三类副成分:SnO2:1000ppm,Ta2O5:500ppm,并加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
实施案例4制备得到的MnZn软磁铁氧体材料的初始磁导率为550,其25℃时的饱和磁感应强度为530mT,100℃时的饱和磁感应强度为430mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为150kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为495kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为483kW m-3,在150℃下,磁导率未出现明显下降。
比较案例1:
选用的主成分的含量以氧化物计为:Fe2O3:71.2wt%、ZnO:5.82wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
比较案例1制备得到的MnZn软磁铁氧体材料的初始磁导率为850,其25℃时的饱和磁感应强度为500mT,100℃时的饱和磁感应强度为380mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为320kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为865kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为1458kW m-3。
比较案例2:
选用的主成分的含量以氧化物计为:Fe2O3:71.64wt%、ZnO:5.46wt%、MnO:余量,将主成分进行一次球磨1h,在930℃预烧2h得到黑色粉末;将预烧得到的黑色粉末加入按主成分的总量计的副成分,副成分含量以氧化物计算为第一类副成分:SiO2:500ppm,CaO:1500ppm,并加入适量的去离子水,二次球磨4h,得到粒径0.7~2μm的粉体颗粒,且粒径分布服从正态分布;将二次球磨后的颗粒烘干后研磨分散,加入聚乙烯醇造粒,过筛得到锰锌铁氧体粉料;将造粒得到的粉料压制成型,放入气氛烧结炉中烧结,烧结温度为1250℃,保温3h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
实施案例1制备得到的MnZn软磁铁氧体材料的初始磁导率为650,其25℃时的饱和磁感应强度为480mT,100℃时的饱和磁感应强度为360mT,在50mT、100℃、1MHz的测试条件下,其功率损耗为380kW m-3,在30mT、100℃、3MHz的测试条件下,其功率损耗为730kW m-3,在10mT、100℃、5MHz的测试条件下,其功率损耗为1325kW m-3。
对比实施案例1与比较案例1,可以发现第一类副成分:SiO2:500ppm,CaO:1500ppm,第二类副成分:V2O5:1000ppm,Nb2O5:3000ppm,第三类副成分:SnO2:1000ppm,CoO:500ppm的复合添加,通过合理的制备工艺参数制备得到的MnZn铁氧体在1~5MHz具有较低的功率损耗,且初始磁导率大于500,磁性能没有被过度破坏,并且饱和磁感应强度得到了提高。
对比实施案例1与比较案例2,可以发现如果只添加第一类副成分:SiO2:500ppm,CaO:1500ppm,材料的性能不能得到充分提高,说明第二类副成分:V2O5:1000ppm,Nb2O5:3000ppm,第三类副成分:SnO2:1000ppm,CoO:500ppm的复合添加对MnZn铁氧体在1~5MHz应用时的功率损耗和磁感应强度都有优化作用。
对比实施案例2与比较案例1,可以发现第一类副成分:SiO2:1000ppm,CaCO3:2000ppm,第二类副成分:TiO2:2000ppm,MoO3:500ppm,第三类副成分:Co3O4:800ppm,ZrO2:300ppm的复合添加,通过合理的制备工艺参数制备得到的MnZn铁氧体在1~5MHz具有较低的功率损耗,且初始磁导率大于500,磁性能没有被过度破坏,并且饱和磁感应强度得到了提高。
对比实施案例3与比较案例1,可以发现第一类副成分:SiO2:500ppm,,Al2O3:1000ppm第二类副成分:Bi2O3:1500ppm,WO3:500ppm,第三类副成分:Co2O3:1000ppm,In2O3:1000ppm的复合添加,通过合理的制备工艺参数制备得到的MnZn铁氧体在1~5MHz具有较低的功率损耗,且初始磁导率大于500,磁性能没有被过度破坏,并且饱和磁感应强度得到了提高。
对比实施案例3与比较案例2,可以发现如果只添加第一类副成分:SiO2:500ppm,CaO:1500ppm,材料的性能不能得到充分提高,说明第二类副成分:Bi2O3:1500ppm,WO3:500ppm,第三类副成分:Co2O3:1000ppm,In2O3:1000ppm的复合添加对MnZn铁氧体在1~5MHz应用时的功率损耗和磁感应强度都有优化作用。
对比实施案例4与比较案例1,可以发现第一类副成分:CaO:1500ppm,Al2O3:1500ppm,第二类副成分:CuO:1000ppm,TiO2:2000ppm,第三类副成分:SnO2:1000ppm,Ta2O5:500ppm的复合添加,通过合理的制备工艺参数制备得到的MnZn铁氧体在1~5MHz具有较低的功率损耗,且初始磁导率大于500,磁性能没有被过度破坏,并且饱和磁感应强度得到了提高。
Claims (3)
1.一种具有高频低温度系数低损耗MnZn软磁铁氧体材料的制备方法,其特征在于包括如下步骤:
(1)一次配料
称取主成分,主成分组成如下:Fe2O3:68wt%~72wt%、ZnO:5wt%~9wt%、MnO:余量;
(2)一次球磨
将主成分均匀混合,将所称取的主成分放入球磨机,球磨3~10h,得到一次球磨粉料;
(3)一次烧结
将第一次球磨所得的粉料在空气气氛下以200~300℃/h的速度升温到800~1000℃,保温1~3h,随炉冷却得到一次烧结粉料;
(4)二次配料
在一次烧结粉料中添加下述三类副成分,其中,第一类副成分包括SiO2、CaO、CaCO3、Li2O、Al2O3中的一种或多种,第二类副成分包括V2O5、CuO、TiO2、Bi2O3、WO3、Nb2O5、MoO3中的一种或多种,第三类副成分包括SnO2、CoO、Co3O4、Co2O3,ZrO2、In2O3、Ta2O5中的一种或多种,三类副成分的添加总量不超过一次烧结粉料的3wt%;
(5)二次球磨
将二次配料后得到的粉料均匀混合后放入球磨机,球磨3~10h,得到二次球磨粉料;
(6)造粒
根据二次球磨后的粉料总重量,加入聚乙烯醇水溶液,其中聚乙烯醇的加入量为粉料总质量的3wt%~10wt%,先预压之后研磨过筛成颗粒;
(7)压制成型
向造粒所得的颗粒料中添加聚乙烯醇水溶液,其中聚乙烯醇的加入量为颗粒料总质量的3wt%~10wt%,压制成型为生坯产品,生坯密度要达到2.6~3.6g/cm3;
(8)二次烧结
烧结温度为1200~1400℃,保温2~14h,烧结过程中通过添加氮气使平衡氧分压控制在4%以下,冷却出炉得到MnZn软磁铁氧体材料。
2.根据权利要求1所述的具有高频低温度系数低损耗MnZn软磁铁氧体材料的制备方法,其特征在于:按主成分总重量计,三类副成分中各成分被选择添加时的添加量如下:
第一类副成分:SiO2:500~2000ppm,CaO:1000~4000ppm,CaCO3:1500~5000ppm,Li2O:500~1000ppm,Al2O3:1000~2000ppm,
第二类副成分:V2O5:500~1500ppm,CuO:500~2000ppm,TiO2:500~2500ppm,Bi2O3:500~3500ppm,WO3:400~1000ppm,Nb2O5:2000~4000ppm,MoO3:400~1000ppm,
第三类副成分:SnO2:500~1500ppm,CoO:400~1200ppm,Co3O4:400~1200ppm,Co2O3:400~1500ppm,ZrO2:200~500ppm,In2O3:500~2000ppm,Ta2O5:200~1000ppm。
3.一种如权利要求1所述方法制备得到的具有高频低温度系数低损耗MnZn软磁铁氧体材料,其特征在于所述的MnZn软磁铁氧体材料形成了无畴壁结构,在100℃,1MHz,50mT的工作条件下,功率损耗低于150kW-3,在100℃,3MHz,10mT的工作条件下,功率损耗低于150kW-3,在100℃,3MHz,30mT工作条件下,功率损耗低于500kW-3,在100℃,5MHz,10mT的工作条件下,功率损耗低于500kW-3,初始磁导率高于500,在工作温度范围内,功率损耗随温度变化不超过50%,磁导率随温度的变化不超过20%。
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