CN108364742A - 一种微晶铁氧体磁芯材料及其在大容量高频变压器中的应用 - Google Patents

一种微晶铁氧体磁芯材料及其在大容量高频变压器中的应用 Download PDF

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CN108364742A
CN108364742A CN201711425083.9A CN201711425083A CN108364742A CN 108364742 A CN108364742 A CN 108364742A CN 201711425083 A CN201711425083 A CN 201711425083A CN 108364742 A CN108364742 A CN 108364742A
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CN108364742B (zh
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王孚亮
张妍
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RIZHAO YIXIN ELECTRONIC MATERIAL CO Ltd
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Abstract

本发明属于磁芯材料技术领域，具体涉及一种铁氧体磁芯材料，还涉及上述的磁芯材料在大容量高频变压器磁芯中的应用，包含有该铁氧体磁芯材料的大容量高频变压器和该铁氧体磁芯材料的制备方法。铁氧体磁芯材料中部分元素的含量如下：主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；氧化铬按CrO3换算在0.6～1.8摩尔％；氧化铜按CuO换算在4.0～8.0摩尔％；氧化镁按MgO换算在20.5～36.0摩尔％、氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧体材料；还添加有氧化锑Sb2O3换算在0.8‑4.3重量%、氧化锡SnO2换算在0.2‑1.6重量%，氧化钛TiO2重量0.2‑1.5%。本发明所提供的合金各方面应用效果比较均衡，具有优异的综合磁性能；其磁感应强度Bs1.5T；矫顽力Hc为0.35A·m‑1,当B为0.5T时，f为20KHz时，高频损耗为30W/kg。

Description

一种微晶铁氧体磁芯材料及其在大容量高频变压器中的应用
技术领域
本发明属于磁芯材料技术领域，具体涉及一种微晶铁氧体磁芯材料，还涉及上述的微晶磁芯材料在大容量高频变压器磁芯中的应用，以及一种包含有该微晶铁氧体磁芯材料的大容量高频变压器和该铁氧体磁芯材料的制备方法。
背景技术
电力电子变压器，即固态变压器，其具有体积小，效率高、可控性好等特点，在大功率的电力电子拓扑中，高频变压器本体是最基础、也是最重要的电磁元件，随着变压器容易的不断增大，变压器的体积不断变大，提高工作频率，可使变压器的体积减小，但是高频下磁芯损耗也会增大，因此选择合适的磁芯材料就尤为重要。
目前常用的高频变压器磁芯的典型材料有硅钢片、铁氧体、非晶和纳米晶合金，而对于这四种典型磁芯材料，又各自有其优点，比如各自的饱和磁通密度，电阻率、磁致伸系数，居里温度和叠片厚度等，这些特性很大程度上决定了高频变压器的性能。
在性能参数中，饱和磁通密度越高，磁芯工作磁通密度处在线性区域的范围内也就越大。电阻率越高，磁芯的涡流损耗也就会越小，磁致伸缩系数越小，磁芯工作时发生的振动和噪声也就越小。而居里温度越高，变压器的工作温度越高。叠片厚度越大，随着工作频率的提高，叠片的趋肤效应更容易发生，进而会增大磁芯损耗。所以，在选择磁芯材料时，需要对比各种材料的综合性能。
发明内容
为了解决上述的技术问题，本发明提供了一种性能参数好的铁氧体磁芯材料，该铁氧体磁芯材料效率高，体积小，成本低；
上述的微晶磁芯材料在大容量高频变压器磁芯中的应用，也是本发明所要保护的范围；
本发明还提供了一种包含有该微晶铁氧体磁芯材料的大容量高频变压器以及该铁氧体磁芯材料的制备方法；
本发明是通过下述的技术方案来实现的：
本发明所提供的微晶铁氧体磁芯材料，该材料中部分元素的含量如下：
主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
相对于上述主成分还添加氧化锶按Sr换算在0.05-0.8%。
上述的铁氧体磁芯材料其起始磁导率μi≥30000。
一种铁氧体磁芯材料在大容量高频变压器中的应用。
一种大容量高频变压器的特点是，该变压器所具有的铁氧体磁芯材料，该磁芯材料主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
Fe2O3为粉末状，其平均粒径为1-2μm。
其磁感应强度Bs1.5T；矫顽力Hc为0.35A·m-1,当B为0.5T时，f为20KHz时，高频损耗为30W/kg。
上述的铁氧体磁芯材料的制备方法，包括下述的步骤：
煅烧以下成分：Fe2O3 、 CrO3 、 CuO 、 MgO、NbO2 、 Sb2O3 、 SnO2、TiO2；
使其铁氧体化，将得到的磁各向同性铁氧体粉碎后，在磁场中加工成形，再解裂成2-10μm的平均粒径，于大气中850～ 100℃下热处理1～3小时。
本发明的有益效果在于，采用本发明所提供的铁氧体材料，其磁感应强度Bs1.5T；矫顽力Hc为0.35A·m-1,当B为0.5T时，f为20KHz时，高频损耗为30W/kg；各方面应用效果比较均衡，具有优异的综合磁性能；而且成本低。
具体实施方式
下面结合具体实施例对本发明作更进一步的说明，以便本领域的技术人员更了解本发明，但并不因此限制本发明。
实施例1
一种微晶铁氧体磁芯材料，该材料中部分元素的含量如下：
主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
上述微晶铁氧体磁芯材料的制备方法，包括下述的步骤：
煅烧以下成分：Fe2O3 、 CrO3 、 CuO 、 MgO、NbO2 、 Sb2O3 、 SnO2、TiO2；
使其铁氧体化，将得到的磁各向同性铁氧体粉碎后，在磁场中加工成形，再解裂成2-10μm的平均粒径，于大气中850～ 100℃下热处理1～3小时。
其起始磁导率μi≥30000；
磁感应强度Bs1.5T；矫顽力Hc为0.35A·m-1,
当B为0.5T时，f为20KHz时，高频损耗为30W/kg。
从以上表格中的比较来看，高频下应用纳米晶磁芯制作的变压器效率最高、体积最小，但缺点是成本非常高；
同样，非晶合金各方面的应用效果也比较均衡，但是非晶合金其磁导率有效；
坡莫合金，具有较高的初始磁导率，低矫顽力，磁性能稳定，但Bs饱和磁感应强度不高，工作频率大于10KHz时，损耗和有效磁导率不理想，价格较昂贵，加工热处理复杂；
铁氧体磁芯制作的高频高压器其优点是具有较高的电阻率，远远高于金属材料 ，能够有效抑制涡流产生，高频损耗极小，价格低，缺点是饱和磁密度低，热稳定性差，易破碎，不适合于高频大功率下使用；而且其还有的最大的不足就是体积大；
而硅钢片磁芯制作的高频变压器具有较高的饱和磁感应强度，但其有效磁导率低尤其是在高频范围内，居里温度高，价格低，最大的不足就是效率低，高频损耗大。
本发明所提供的合金各方面应用效果比较均衡，具有优异的综合磁性能。
关于实施例1的磁芯材料的性能特性与其它种类的磁芯材料的性能特性比较如下表：
从以上表格中的数据可以看出，硅钢片的饱和磁通密度最大而磁致伸缩系数最小，但其最大的不足之处就是电阻最小和叠片厚度最大，在高频下， 趋肤效应会很明显，涡流损耗会很大。普通铁氧体电阻率是最高的，磁致伸缩系数也很小，但其最大的不足之处是饱和磁通密度最低，所以，对于铁氧体，可选择的工作磁通密度范围就很小，一般取0.15-0.25T左右，相同频率时，变压器体积会很大。非晶合金各方面特性都不错，但最大的不足之处就是磁致伸缩系数是最大的，所以非晶合金应用于高频变压器磁芯时，振动和噪声会很大，而对于本实施例1的微晶材料 ，各方面的性能都比较好，适用于大容易高频变压器磁芯材料。
实施例2
一种铁氧体磁芯材料，该材料中部分元素的含量如下：
主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
相对于上述主成分还添加氧化锶按Sr换算在0.05-0.8%。
实施例3
一种大容量高频变压器，其磁芯材料为铁氧体磁芯材料，该材料中部分元素的含量如下：
主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。

Claims (8)

1.一种微晶铁氧体磁芯材料，其特征在于，该材料中部分元素的含量如下：
主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
2.如权利要求1所述的一种微晶铁氧体磁芯材料，其特征在于，相对于上述主成分还添加氧化锶按Sr换算在0.05-0.8%。
3.如权利要求1所述的一种微晶铁氧体磁芯材料，其特征在于，其起始磁导率μi≥30000。
4.如权利要求1所述的一种微晶铁氧体磁芯材料在大容量高频变压器中的应用。
5.一种大容量高频变压器，其特征在于，该变压器所具有的微晶铁氧体磁芯材料，其特征如下：主成分含有氧化铁Fe2O3换算在40.2～55.80摩尔％；
氧化铬按CrO3换算在0.6～1.8摩尔 ％；
氧化铜按CuO换算在4.0～8.0摩尔％、；
氧化镁按MgO换算在20.5～ 36.0摩尔％、
氧化铌按NbO2换算为剩余的摩尔百分数的NbCuMg系铁氧 体材料；
还添加有氧化锑Sb2O3换算在0.8-4.3重量%、氧化锡SnO2换算在0.2-1.6重量%，氧化钛TiO2重量0.2-1.5%。
6.如权利要求1所述的一种微晶铁氧体磁芯材料，其特征在于，Fe2O3为粉末状，其平均粒径为1-2μm。
7.如权利要求1所述的一种微晶铁氧体磁芯材料，其特征在于，其磁感应强度Bs1.5T；矫顽力Hc为0.35A·m-1,
当B为0.5T时，f为20KHz时，高频损耗为30W/kg。
8.一种微晶铁氧体磁芯材料的制备方法，包括下述的步骤：
煅烧以下成分：Fe2O3 、 CrO3 、 CuO 、 MgO、NbO2 、 Sb2O3 、 SnO2、TiO2；
使其铁氧体化，将得到的磁各向同性铁氧体粉碎后，在磁场中加工成形，再解裂成2-10μm的平均粒径，于大气中850～ 100℃下热处理1～3小时。
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