CN113292331A - 一种宽温耐超大电流MnZn铁氧体材料及其制备方法 - Google Patents
一种宽温耐超大电流MnZn铁氧体材料及其制备方法 Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 75
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- UPWOEMHINGJHOB-UHFFFAOYSA-N cobalt(III) oxide Inorganic materials O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 52
- 239000004576 sand Substances 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000007921 spray Substances 0.000 claims description 30
- 238000005245 sintering Methods 0.000 claims description 27
- 239000008187 granular material Substances 0.000 claims description 24
- 238000005469 granulation Methods 0.000 claims description 24
- 230000003179 granulation Effects 0.000 claims description 24
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- 239000001301 oxygen Substances 0.000 claims description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 23
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 17
- 238000004321 preservation Methods 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 239000002002 slurry Substances 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 4
- 238000003801 milling Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 229910052596 spinel Inorganic materials 0.000 claims description 2
- 239000011029 spinel Substances 0.000 claims description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 4
- 239000000654 additive Substances 0.000 abstract description 12
- 230000000996 additive effect Effects 0.000 abstract description 5
- 229910004298 SiO 2 Inorganic materials 0.000 abstract description 3
- 229910010413 TiO 2 Inorganic materials 0.000 abstract description 3
- 230000005389 magnetism Effects 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 description 11
- 239000003292 glue Substances 0.000 description 6
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 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
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
本发明适用于软磁技术领域,提供了一种宽温耐超大电流MnZn铁氧体材料及其制备方法,一种宽温耐超大电流MnZn铁氧体材料,由主成分和辅助成分组成;主成分及含量以氧化物计算为:Fe2O3:51.80~54.00mol%,ZnO:15.00~18.00mol%,MnO:29.50~32.00mol%;按主成分总重量百分比计的辅助成分为:Nb2O5:100~500ppm,ZrO2:200~600ppm,TiO2:100~500ppm,CaCO3:300~800ppm,SiO2:10~80ppm,Co2O3:2000~5000ppm,V2O5:100~500ppm中的四种以上。本发明通过调整控制Fe2O3含量与添加物Co2O3和V2O5含量来综合调整控制‑40℃及85℃叠加特性、材料的磁导率及增量磁导率,解决了现有材料负温,高温兼顾不周的问题,本材料在负温‑40℃及85℃处其直流叠加特性均良好,且本发明制备方法简便易行。
Description
技术领域
本发明属于软磁技术领域,涉及一种MnZn铁氧体及其制备方法。
背景技术
MnZn铁氧体材料具有高饱和磁感应强度、高磁导率、低损耗等优点,被广泛应用于汽车电子、新能源、绿色照明、平板显示等领域。随着电子技术的快速发展,要求铁氧体材料在40~85℃宽温条件下的、磁导率直流叠加特性要良好,即要求在直流偏置磁场下对铁氧体材料的磁导率特性、损耗特性的影响要小。在通讯技术中,随着电子信息技术的不断发展,要求各类电子设备趋向于通讯系统的小型化,轻量化,用于100Mbps/1000Mbps系统的脉冲变压器中,要求在40~85℃内,8mA直流叠加条件下稳定工作,具有较高的磁导率,并且在大电流条件下能够提供工作的可靠性,对于其中用到的软磁铁氧体材料提出了越来越高的要求,不仅希望MnZn铁氧体具有更高的饱和磁通密度和较高初始磁导率,而且在宽温范围内能够耐更大电流的材料。
中国专利文献上公开的“一种大电流锰锌铁氧体制备”,其公告号 CN107399965A,其采用四组分配方Fe2O3、MnO、ZnO和Co2O3,通过添加 Nb2O5、CaCO3制备的耐电流材料在-40℃较好,但在85℃条件下,叠加特性跌幅较大,高温特性较差。
发明内容
针对上述现有技术存在不足,本发明的目的首先是提供一种宽温耐超大电流MnZn铁氧体材料,第二个目的是提供该材料的制备方法。
为实现本发明的目的,发明人提供下述技术方案。
本发明是这样实现的,一种宽温耐超大电流MnZn铁氧体材料,由主成分和辅助成分组成;
主成分及含量以氧化物计算为:Fe2O3:51.80~54.00mol%,ZnO: 15.00~18.00mol%,MnO:29.50~32.00mol%;
按主成分总重量百分比计的辅助成分为:Nb2O5:100~500ppm,ZrO2: 200~600ppm,TiO2:100~500ppm,CaCO3:300~800ppm,SiO2:10~80ppm, Co2O3:2000~5000ppm,V2O5:100~500ppm中的四种以上。
优选的,主成分及含量以氧化物计算为:Fe2O3:52.00~53.80mol%,ZnO: 16.00~17.00mol%,MnO:30.50~31.50mol%。
优选的,按主成分总重量百分比计的辅助成分为:Nb2O5:200~400ppm, ZrO2:300~500ppm,TiO2:200~400ppm,CaCO3:400~700ppm,SiO2:20~60ppm, Co2O3:3000~4000ppm,V2O5:200~400ppm中的四种以上。
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取主成分各原料,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入去离子水进行砂磨,砂磨时间90~240分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆进行喷雾造粒,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料预烧得到预烧料,预烧温度830~950℃,预烧时间2~6小时;
S5、二次砂磨:称取预烧料并按比例加入称好的辅助成分,然后在砂磨机内加入去离子水进行二次砂磨,二次砂磨时间3~6小时;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,制程粒径为40~200 目的颗粒,得到造粒粉;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在4~8Mpa 压力下压制成坯体;
S8、烧结:将S7中的坯体在1280~1360℃温度下进行烧结,烧结后即形成具有尖晶石结构的MnZn铁氧体材料;
S9、测试:
用第一分析仪在100kHz、200mT条件下测试MnZn铁氧体材料的损耗特性;
用第二分析仪在50Hz、1194A/m条件下测试MnZn铁氧体材料的饱和磁通密度;
用仪器测试MnZn铁氧体材料直流叠加特性。
优选的,S8的烧结过程在平衡氧分压下进行,并且遵循Blank方程
Log(PO2%)=A~B/T,其中,A取值6.4~7.6,B=13000~14500,烧结过程在升温段900~1200℃内的氧分压控制在范围0.05~0.5%,保温段氧分压范围为 1.5~6.0%,保温时间为4~8小时。
优选的,第一分析仪采用IWATSU~8232交流B~H分析仪,第二分析仪采用IWATSU~8258交流B~H分析仪。
优选的,S9中的仪器为E4980A和TH2778和高低温箱。
与现有技术相比,本发明的有益效果是:本发明通过调整控制Fe2O3含量与添加物Co2O3和V2O5含量来综合调整控制-40℃及85℃叠加特性,材料的磁导率及增量磁导率,降低材料损耗、提高材料在负温条件下的饱和磁通密度Bs,同时兼顾低温-40℃与高温85℃处的直流衰减,解决了现有材料负温,高温兼顾不周的问题,本材料在负温-40℃及85℃处其直流叠加特性均良好,且本发明制备方法简便易行。
附图说明
图1为本发明一种宽温耐超大电流MnZn铁氧体材料的制备方法的流程示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
在本发明中,若非特指,所有的主成份均为摩尔百分比单位、辅助成分均为重量百分比单位,所有的设备和原料等均可从直接市场购得或是本行业常用的物料。
实施例1
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:52.60mol%,ZnO:16.90mol%,MnO:30.5mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:5.5:0.8的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中880℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:6:0.7 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为:Nb2O5:280ppm,CaCO3:500ppm,SiO2:15ppm,Co2O3:2500ppm, V2O5:300ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1320℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,其在升温段900~1200℃内的氧分压范围控制在0.5%以下,保温段氧分压范围为3.2%,保温时间为5小时;
S9、测试性能结果如下表:
T5.26*1.85*2.4绕线匝数22匝,叠加25mA,磁导率
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1538 | 2151 | 1990 | 1784 | 1657 |
2 | 1582 | 2121 | 2031 | 1800 | 1763 |
3 | 1557 | 2146 | 2018 | 1825 | 1628 |
实施例2
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:53.00mol%,ZnO:17.00mol%,MnO: 30.00mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:5.5:0.8的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中900℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:6.5:0.8 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为:Nb2O5:300ppm,CaCO3:600ppm,SiO2:18ppm,Co2O3:2800ppm, V2O5:330ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1340℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,其在升温段900~1200℃内的氧分压范围控制在0.35%以下,保温段氧分压范围为3.5%,保温时间为5小时;
S9、测试性能结果如下表:
T5.26*1.85*2.4绕线匝数22匝,叠加25mA,磁导率
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1661 | 2276 | 2176 | 1934 | 1654 |
2 | 1591 | 2248 | 2134 | 1882 | 1647 |
3 | 1591 | 2286 | 2215 | 1978 | 1676 |
实施例3
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:53.30mol%,ZnO:17.10mol%,MnO: 29.60mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:6.5:0.7的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中930℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:6.5:0.8 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为:Nb2O5:280ppm,CaCO3:500ppm,SiO2:15ppm,Co2O3:3200ppm, V2O5:280ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1350℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,其在升温段900~1200℃内的氧分压范围控制在0.3%以下,保温段氧分压范围为2.75%,保温时间为5小时;
S9、测试性能结果如下表:
T5.26*1.85*2.4绕线匝数22匝,叠加25mA,磁导率
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1578 | 2233 | 2138 | 1961 | 1784 |
2 | 1578 | 2311 | 2191 | 2010 | 1747 |
3 | 1554 | 2245 | 2134 | 1932 | 1631 |
实施例4
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:53.50mol%,ZnO:16.90mol%,MnO: 30.60mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:6.5:0.7的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中900℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:7:0.8 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为:Nb2O5:300ppm,CaCO3:600ppm,SiO2:18ppm,Co2O3:3000ppm, V2O5:320ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1350℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,其在升温段900~1200℃内的氧分压范围控制在0.5%以下,保温段氧分压范围为3.0%,保温时间为5小时;
S9、测试性能结果如下表:
T5.26*1.85*2.4绕线匝数22匝,叠加25mA,磁导率
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1518 | 2139 | 2069 | 1822 | 1529 |
2 | 1559 | 2172 | 2034 | 1863 | 1534 |
3 | 1537 | 2196 | 2088 | 1825 | 1554 |
对比例1
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:53.50mol%,ZnO:7.60mol%,MnO:38.90mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:6:0.8的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中900℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:6:0.7 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为:Nb2O5:300ppm,CaCO3:600ppm,SiO2:18ppm,Co2O3:3000ppm, V2O5:320ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1300℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,保温段氧分压范围为5.2%,保温时间为5小时;
S9、测试性能结果如下表:
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1034 | 1812 | 1903 | 1627 | 1126 |
2 | 1075 | 1920 | 1920 | 1714 | 1163 |
3 | 1116 | 2002 | 2084 | 1833 | 1262 |
对比例2
一种宽温耐超大电流MnZn铁氧体材料的制备方法,包括以下步骤:
S1、配料:按比例称取Fe2O3:53.30mol%,ZnO:8.80mol%,MnO:38.60mol%,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入料:球:水比例为1:6:0.8的去离子水并砂磨180分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆在喷雾塔中进行喷雾造粒,进口温度320℃,出口温度90℃,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料在回转窑中900℃下进行预烧,预烧时间3小时,得到预烧料;
S5、二次砂磨:称取预烧料至砂磨机中,再加入料:球:水比例为1:6:0.7 的去离子水,砂磨4小时,并加入如下组分的添加剂,按主成分总重量百分比计为CaCO3:300ppm,SnO2:500ppm,Co2O3:4400ppm,ZrO2:500ppm,并加入总质量10%、质量分数为0.8%的胶水;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,进口温度320℃,出口温度90℃;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在5Mpa 压制成坯体;
S8、烧结:将S7中的坯体在1300℃温度下烧结,烧结过程在平衡氧分压下进行,Blank方程Log(PO2%)=A~B/T,保温段氧分压范围为4.5%,保温时间为5小时;
S9、测试性能结果如下表:
T5.26*1.85*2.4绕线匝数22匝,叠加25mA,磁导率
序号 | -40℃ | 0℃ | 25℃ | 60℃ | 85℃ |
1 | 1055 | 1837 | 1858 | 1656 | 1475 |
2 | 1038 | 1730 | 1878 | 1709 | 1438 |
3 | 1083 | 1759 | 1932 | 1705 | 1376 |
由上述性能测试结果可以得出,采用本发明中的配方和工艺制得的MnZn 铁氧体与对比例相比具有在宽温(-40~85℃)叠加大电流特性更好,且损耗比较低≤550Mw/cm3)
从实施例制备得到的MnZn铁氧体材料所得数据表明,在本发明的主配方中,即Fe2O3、MnO和ZnO的摩尔比要控制在一定的范围,尤其控制Fe2O3、 MnO和ZnO摩尔含量,提高材料的饱和磁通密度,通过添加Co2O3来调整材料的谷点温度,附以添加物V2O5和Nb2O5,严格控制添加物Co2O3与V2O5的添加比例,降低烧结温度,细化晶粒,通过烧结做致密化的方式进一步提高密度,增强其材料的耐大电流能力。
从实施例制备得到的MnZn铁氧体材料所得数据表明,本发明的最佳方案主配方为Fe2O3:52.5~53.50mol%、MnO:29.50~30.5mol%和ZnO:16.8~19.2mol%,添加剂Nb2O5:280~300ppm,CaCO3:500~600ppm,SiO2: 15~18ppm,Co2O3:2500~3200ppm,V2O5:280~330ppm,Co2O3与V2O5之和≤3800ppm,制程烧结时附以致密化工艺即在升温段900~1200℃,氧含量控制在 0.50%以内,保温段坚持低氧含量烧结。
所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (7)
1.一种宽温耐超大电流MnZn铁氧体材料,其特征在于,由主成分和辅助成分组成;
主成分及含量以氧化物计算为:Fe2O3:51.80~54.00mol%,ZnO:15.00~18.00mol%,MnO:29.50~32.00mol%;
按主成分总重量百分比计的辅助成分为:Nb2O5:100~500ppm,ZrO2:200~600ppm,TiO2:100~500ppm,CaCO3:300~800ppm,SiO2:10~80ppm,Co2O3:2000~5000ppm,V2O5:100~500ppm中的四种以上。
2.如权利要求1所述的一种宽温耐超大电流MnZn铁氧体材料,其特征在于,主成分及含量以氧化物计算为:Fe2O3:52.00~53.80mol%,ZnO:16.00~17.00mol%,MnO:30.50~31.50mol%。
3.如权利要求1所述的一种宽温耐超大电流MnZn铁氧体材料,其特征在于,按主成分总重量百分比计的辅助成分为:Nb2O5:200~400ppm,ZrO2:300~500ppm,TiO2:200~400ppm,CaCO3:400~700ppm,SiO2:20~60ppm,Co2O3:3000~4000ppm,V2O5:200~400ppm中的四种以上。
4.一种宽温耐超大电流MnZn铁氧体材料的制备方法,其特征在于,包括以下步骤:
S1、配料:按比例称取主成分各原料,混合均匀得到混合物;
S2、一次砂磨:将混合物加入到砂磨机中,在砂磨机内加入去离子水进行砂磨,砂磨时间90~240分钟;
S3、一次喷雾造粒:将研磨混合均匀的料浆进行喷雾造粒,除去料浆中的水分制成颗粒料;
S4、预烧:将S3中的颗粒料预烧得到预烧料,预烧温度830~950℃,预烧时间2~6小时;
S5、二次砂磨:称取预烧料并按比例加入称好的辅助成分,然后在砂磨机内加入去离子水进行二次砂磨,二次砂磨时间3~6小时;
S6、喷雾造粒:将S5中砂磨后的浆料进行喷雾造粒,制程粒径为40~200目的颗粒,得到造粒粉;
S7、成型:向造粒粉中加入颗粒料重量的0.08~0.10%的硬脂酸锌在4~8Mpa压力下压制成坯体;
S8、烧结:将S7中的坯体在1280~1360℃温度下进行烧结,烧结后即形成具有尖晶石结构的MnZn铁氧体材料;
S9、测试:
用第一分析仪在100kHz、200mT条件下测试MnZn铁氧体材料的损耗特性;
用第二分析仪在50Hz、1194A/m条件下测试MnZn铁氧体材料的饱和磁通密度;
用仪器测试MnZn铁氧体材料直流叠加特性。
5.如权利要求4所述的一种宽温耐超大电流MnZn铁氧体材料的制备方法,其特征在于,S8的烧结过程在平衡氧分压下进行,并且遵循Blank方程Log(PO2%)=A~B/T,其中,A取值6.4~7.6,B=13000~14500,烧结过程在升温段900~1200℃内的氧分压控制在范围0.05~0.5%,保温段氧分压范围为1.5~6.0%,保温时间为4~8小时。
6.如权利要求4所述的一种宽温耐超大电流MnZn铁氧体材料的制备方法,其特征在于,第一分析仪采用IWATSU~8232交流B~H分析仪,第二分析仪采用IWATSU~8258交流B~H分析仪。
7.如权利要求4所述的一种宽温耐超大电流MnZn铁氧体材料的制备方法,其特征在于,S9中的仪器为E4980A和TH2778和高低温箱。
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