CN108863339A - 一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料 - Google Patents

一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料 Download PDF

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CN108863339A
CN108863339A CN201810781058.2A CN201810781058A CN108863339A CN 108863339 A CN108863339 A CN 108863339A CN 201810781058 A CN201810781058 A CN 201810781058A CN 108863339 A CN108863339 A CN 108863339A
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赵旭
严正信
肖时勇
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Hengdian Group DMEGC Magnetics Co Ltd
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Abstract

本发明涉及提供了一种解决同时具有高频、大磁场应用，宽温低损耗特性的问题的新配方，高频大磁场宽温低损耗软磁铁氧体材料，主成分为Fe2O3、MnO与ZnO，按Fe2O3、MnO与ZnO总量计算的含有53.0‑55.0mol％的Fe2O3，5.5‑7.5mol％的ZnO，余量为MnO。

Description

一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体 材料
技术领域
本发明涉及铁氧体材料技术领域，尤其涉及一种应用于高频(500kHz)大磁场(70mT) 变压器的具有宽温低损耗特性的MnZn铁氧体材料。
背景技术
电子设备一直在向小型化、薄型化、高效率的方向发展。变压器作为电子设备的核心器件，其小型化一直是电子行业的发展方向。根据变压器输入功率的公式：
Pin＝C*f*B*Ae*Wd……①
其中，Pin为输入功率，C和Wd未系数，f为工作频率，B为工作磁场大小，Ae为有效磁芯截面积。
为了降低磁芯体积，即降低Ae，需提高f*B的值，而提高工作频率f是常规的使用手段。
根据磁芯的损耗公式：
PL＝Kh*B3*f+Ke*B2*f2+Pr……②
其中PL是磁芯总损耗，Kh是磁滞损耗系数，Ke是涡流损耗系数，B是应用的磁场，f是应用的频率，Pr是剩余损耗，在500kHz条件下由于其值仍然较小，可以忽略不计。
通过公式②，可以看出，如果使用频率提升，为了保持PL处于较低水平，必须同时降低B。
根据公式①，为了小型化，需要提高B*f，根据公式②，为了维持较低的功率损耗，提高f的同时，必须降低B，两者是矛盾的关系。
常规的功率铁氧体使用的条件一般是：f＝100kHz，B＝200mT；本发明的条件是： f＝500kHz，B＝70mT。本发明的B*f是一般条件的1.75倍，理论上，可以使磁芯体积缩小42.86％。
常规的功率铁氧体(f＝＝100kHz，B＝200mT)功耗水平一般在250-400mW/cm3。而本发明的功率铁氧体(f＝500kHz，B＝70mT)的功耗水平在200mW/cm3以下，变压器转化效率还可以进一步提高。
发明内容
本发明的目的在于为了解决解决同时具有高频、大磁场应用，宽温低损耗特性的问题而提供了一种应用于高频(500kHz)大磁场(70mT)变压器的具有宽温低损耗特性的MnZn 铁氧体材料。
为了实现上述目的，本发明采用以下技术方案：
一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料，高频大磁场宽温低损耗软磁铁氧体材料，主成分为Fe2O3、MnO与ZnO，按Fe2O3、MnO与ZnO总量计算的含有 53.0-55.0mol％的Fe2O3，5.5-7.5mol％的ZnO，余量为MnO。
作为优选，相对于主成分的总重量还包含如下含量的第一副成分：Co2O3为0.3-0.5wt％。
作为优选，相对于主成分的总重量还包含如下含量的第二副成分：CaCO3为 0.06-0.1wt％，Nb2O5为0.01-0.03wt％，ZrO2为0.01-0.03wt％。
作为优选，高频大磁场宽温低损耗软磁铁氧体材料通过以下方法制备：
(1)配料
按照配比，分别以Fe2O3、MnO、ZnO形式计算比例，称取Fe2O3、Mn3O4、ZnO三种原料，然后在砂磨机中加入去离子水进行混合和破碎，时间40分钟，循环混合10分钟后进行喷雾造粒；
(2)预烧
将喷雾料放入预烧炉中，在750℃下进行预烧，时间3个小时；
(3)二次砂磨
在预烧料中加入以下按预烧料重量百分比的辅助成分：CaCO3：0.08wt％，Nb2O5：0.02wt％， ZrO2：0.02wt％；然后将粉料放入砂磨机中加入去离子水进行二次砂磨，砂磨时间90分钟；
(4)喷雾造粒和成型
在二次砂磨料中加入0.08wt％的PVA，以及0.004wt％的消泡剂，然后在喷雾塔中进行喷雾造粒成50-200μm的颗粒；将颗粒成型成密度为3.10-3.20g/cm3的H12.5*7.5*5mm标准样环毛坯；
(5)烧结
烧结曲线：常温到最高温度，升温速度3℃/min，空气；最高温度为1160-1230℃，保温5h，氧气浓度0.8％-1.6％；降温到900℃，降温速度为1.67℃/min，按照平衡氧气浓度设定；降温到常温，降温速度为3℃/min，氮气；
(6)测试
将烧结好的样环用CH3302测试磁导率，用日本岩崎公司的SY8218仪器进行功耗Pcv及饱和磁通密度Bs的测试。
高频大磁场宽温低损耗软磁铁氧体材料具有如下性能：
μi[25℃]＝1100±25％(@1KHz，0.25mT)；
Bs[100℃]≥400mT(@50Hz，1194A/m)；
Pcv[25℃]≤120kW/m3(@500KHz，70mT)；
Pcv[100℃]≤150kW/m3(@500KHz，70mT)；
Pcv[120℃]≤180kW/m3(@500KHz，70mT)。
本发明的有益效果是本发明提供了一种解决同时具有高频、大磁场应用，宽温低损耗特性的问题的新配方。
具体实施方式
以下结合具体实施例，对本发明作进一步的解释：
高频大磁场宽温低损耗软磁铁氧体材料通过以下方法制备：
(1)配料
按照配比，分别以Fe2O3、MnO、ZnO形式计算比例，称取Fe2O3、Mn3O4、ZnO三种原料，然后在砂磨机中加入去离子水进行混合和破碎，时间40分钟，循环混合10分钟后进行喷雾造粒；
(2)预烧
将喷雾料放入预烧炉中，在750℃下进行预烧，时间3个小时；
(3)二次砂磨
在预烧料中加入以下按预烧料重量百分比的辅助成分：CaCO3：0.08wt％，Nb2O5：0.02wt％， ZrO2：0.02wt％；然后将粉料放入砂磨机中加入去离子水进行二次砂磨，砂磨时间90分钟；
(4)喷雾造粒和成型
在二次砂磨料中加入0.08wt％的PVA，以及0.004wt％的消泡剂，然后在喷雾塔中进行喷雾造粒成50-200μm的颗粒；将颗粒成型成密度为3.10-3.20g/cm3的H12.5*7.5*5mm标准样环毛坯；
(5)烧结
烧结曲线：常温到最高温度，升温速度3℃/min，空气；最高温度为1160-1230℃，保温5h，氧气浓度0.8％-1.6％；降温到900℃，降温速度为1.67℃/min，按照平衡氧气浓度设定；降温到常温，降温速度为3℃/min，氮气；
(6)测试
将烧结好的样环用CH3302测试磁导率，用日本岩崎公司的SY8218仪器进行功耗Pcv及饱和磁通密度Bs的测试。
实施例1
Fe2O3＝53.0mol％、ZnO＝7.5mol％、MnO＝39.5mol％、Co2O3＝0.5wt％。
性能：
见表1，下同
实施例2
Fe2O3＝54.0mol％、ZnO＝6.5mol％、MnO＝39.5mol％、Co2O3＝0.4wt％。
实施例3
Fe2O3＝55.0mol％、ZnO＝5.5mol％、MnO＝39.5mol％、Co2O3＝0.3wt％。
对比例1
Fe2O3＝52.5mol％、ZnO＝8.0mol％、MnO＝39.5mol％、Co2O3＝0.5wt％。
对比例2
Fe2O3＝55.5mol％、ZnO＝5.0mol％、MnO＝39.5mol％、Co2O3＝0.2wt％。
对比例3
Fe2O3＝55.0mol％、ZnO＝5.5mol％、MnO＝39.5mol％、Co2O3＝0.2wt％。
对比例4
Fe2O3＝53.0mol％、ZnO＝7.5mol％、MnO＝39.5mol％、Co2O3＝0.6wt％。
实施例及对比例说明：
1.对比例1中，Fe2O3含量过低，ZnO含量过高，整体损耗升高，各温度段均超过标准。
2.对比例2中，Fe2O3含量过高，25℃的损耗扔保持较低水平，但高温部分，尤其是120℃损耗超过标准。
3.对比例3中，Co2O3含量过低，K1补偿不足，25℃和120℃的损耗无法压低，本例结果中，120℃损耗超过标准。
4.对比例4中，Co2O3含量过高，K1补偿过量，整体损耗升高，各温度段均超过标准。

Claims (4)

1.一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料，其特征在于，高频大磁场宽温低损耗软磁铁氧体材料，主成分为Fe2O3、MnO与ZnO，按Fe2O3、MnO与ZnO总量计算的含有53.0-55.0mol％的Fe2O3，5.5-7.5mol％的ZnO，余量为MnO。
2.根据权利要求1所述的一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料，其特征在于，相对于主成分的总重量还包含如下含量的第一副成分：Co2O3为0.3-0.5wt％。
3.根据权利要求1或2所述的一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料，其特征在于，相对于主成分的总重量还包含如下含量的第二副成分：CaCO3为0.06-0.1wt％，Nb2O5为0.01-0.03wt％，ZrO2为0.01-0.03wt％。
4.根据权利要求3所述的一种应用于高频大磁场变压器上的宽温低损耗MnZn铁氧体材料，其特征在于，高频大磁场宽温低损耗软磁铁氧体材料通过以下方法制备：
(1)配料
按照配比，分别以Fe2O3、MnO、ZnO形式计算比例，称取Fe2O3、Mn3O4、ZnO三种原料，然后在砂磨机中加入去离子水进行混合和破碎，时间40分钟，循环混合10分钟后进行喷雾造粒；
(2)预烧
将喷雾料放入预烧炉中，在750℃下进行预烧，时间3个小时；
(3)二次砂磨
在预烧料中加入以下按预烧料重量百分比的辅助成分：CaCO3：0.08wt％，Nb2O5：0.02wt％，ZrO2：0.02wt％；然后将粉料放入砂磨机中加入去离子水进行二次砂磨，砂磨时间90分钟；
(4)喷雾造粒和成型
在二次砂磨料中加入0.08wt％的PVA，以及0.004wt％的消泡剂，然后在喷雾塔中进行喷雾造粒成50-200μm的颗粒；将颗粒成型成密度为3.10-3.20g/cm3的H12.5*7.5*5mm标准样环毛坯；
(5)烧结
烧结曲线：常温到最高温度，升温速度3℃/min，空气；最高温度为1160-1230℃，保温5h，氧气浓度0.8％-1.6％；降温到900℃，降温速度为1.67℃/min，按照平衡氧气浓度设定；降温到常温，降温速度为3℃/min，氮气；
(6)测试
将烧结好的样环用CH3302测试磁导率，用日本岩崎公司的SY8218仪器进行功耗Pcv及饱和磁通密度Bs的测试。
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