CN110963794A - 一种经济型永磁铁氧体材料的制备方法 - Google Patents

一种经济型永磁铁氧体材料的制备方法 Download PDF

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CN110963794A
CN110963794A CN201811155873.4A CN201811155873A CN110963794A CN 110963794 A CN110963794 A CN 110963794A CN 201811155873 A CN201811155873 A CN 201811155873A CN 110963794 A CN110963794 A CN 110963794A
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permanent magnetic
magnetic ferrite
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张伟
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NANJING MEIBAO NEW PATTERN BUILD MATERIAL Co.,Ltd.
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Abstract

本发明公开了一种经济型永磁铁氧体材料的制备方法，主要解决现有永磁铁氧体材料制备时需要添加稀土、永磁铁氧体材料生产成本高的技术问题。本发明方法包括以下步骤：湿磨混料；一次预烧；粗粉碎；湿磨制浆；湿压磁场成型；二次烧结；熟坯打磨。本发明通过控制主原料中Fe2O3和SrCO3的摩尔比为5.90‑6.10，优化一次添加剂、二次添加剂配置，在不加入稀土的条件，降低了永磁铁氧体材料的制备成本，制得永磁铁氧体材料的永磁铁氧体材料的剩余磁感应强度Br≥412mT，矫顽力Hcb≥308kA/m和内禀矫顽力Hcj≥336kA/m。

Description

一种经济型永磁铁氧体材料的制备方法
技术领域
本发明涉及一种永磁材料的制备方法，特别涉及一种经济型永磁铁氧体材料的制备方法，属于磁性材料的制造领域。
背景技术
永磁铁氧体材料作为磁性材料的一个重要组成部分，在家电、计算机、汽车、通信等行业发挥着重要的作用。由于永磁铁氧体材料中不含有Ni、Co以及稀土等高价格金属元素，因此价格较低。又因其磁性能适中，化学稳定性好，相对质量较低，性价比高于其他永磁材料，在市场上已占主导地位。
永磁铁氧体应用最广泛的是锶铁氧体，属于六角晶系，称为M型六角晶系铁氧体。六角晶体的对称性低于立方晶体，具有较大的各向异性常数，从而可制备出高矫顽力的永磁铁氧体。一般M型六角晶系铁氧体可以表示为：
MO·6Fe2O3，式中M为Ba、Sr、Pb等。
随着科技进步，电子产品不断更新换代，电子设备向着小型化、轻型化、薄型化发展，给永磁铁氧体材料的性能提出了更高的要求。目前市场上多是通过LaCo等稀土元素的添加提高铁氧体磁性能，由于稀土元素价格较高且波动较大，添加稀土元素的永磁铁氧体材料成本相对较高。
现有剩余磁感应强度Br≥412mT，矫顽力Hcb≥308kA/m，内禀矫顽力Hcj≥336kA/m的永磁铁氧体材料制备时需要添加稀土，永磁铁氧体材料生产成本高。
发明内容
本发明的目的是提供一种经济型永磁铁氧体材料的制备方法，主要解决现有永磁铁氧体材料制备时需要添加稀土、永磁铁氧体材料生产成本高的技术问题，本发明方法无需加入稀土，生产的永磁铁氧体材料的剩余磁感应强度Br≥412mT，矫顽力Hcb≥308kA/m和内禀矫顽力Hcj≥336kA/m的永磁铁氧体材料。
本发明采用的技术方案是，
一种经济型永磁铁氧体材料的制备方法，包括以下步骤：
1)湿磨混料，以水为湿磨分散介质，将主原料和一次添加剂同时加入球磨机中，进行1～3小时的湿磨混料，获得湿磨料浆，湿磨料浆的粒度为0.9-1.0μm，所述主原料的组分及比例为：氧化铁粉86.45～86.84wt％，碳酸锶为13.55～14.16wt％，主原料中Fe2O3和SrCO3的摩尔比为5.90-6.10，氧化铁粉中Fe2O3的重量百分含量≥98％，碳酸锶中SrCO3的重量百分含量≥97％，所述一次添加剂为工业纯二氧化硅，一次添加剂以主原料重量计的添加比例为CaCO30.1-0.4wt％，SiO20.1-0.3wt％，Al2O30-0.3wt％；
2)一次预烧，将经湿磨混料得到的料浆在空气中进行预烧，温度为1150～1280℃，保温1～3小时，获得一次预烧料；
3)粗粉碎，将一次预烧料利用球磨机粉碎后进行粒级筛分获得粒度为1～75μm预烧料粗粉；
4)湿磨制浆，在粗粉碎得到的粗粉中添加二次添加剂后用球磨机进行细磨16～22小时，以水为分散介质，获得细磨料浆，细磨料浆的粒度为0.6～0.7μm，比表面积为1～12m2/g，所述的二次添加剂以粗粉重量计的添加比例为：CaCO30.8-1.2wt％，SiO20.2-0.4wt％，H3BO30.2-0.5wt％，Al2O30.2-0.4wt％，Cr2O30.2～0.4wt％；
5)湿压磁场成型，将细磨得到的细磨料浆浓缩为含水为35～55wt％的成型料浆，在外加磁场为6～18kOe、成型压力为9.8～98Mpa的条件下压制成生坯；
6)二次烧结，将成型所得生坯在空气中进行烧结，温度为1180～1210℃，保温2～5小时，获得熟坯；
7)熟坯打磨，采用自动磨床将熟坯进行打磨后获得样品。
本发明方法通过控制主原料中Fe2O3和SrCO3的摩尔比为5.90-6.10，优化一次添加剂、二次添加剂配置，在不加入稀土的条件，生产的永磁铁氧体材料的剩余磁感应强度Br≥412mT，矫顽力Hcb≥308kA/m和内禀矫顽力Hcj≥336kA/m的永磁铁氧体材料。
本发明相比现有技术具有如下积极效果：
在不添加稀土元素的情况下，通过一次摩尔比配比，优化一次添加剂、二次添加剂配置，制备出具有高性能Br≥412mT，Hcb≥308kA/m，Hcj≥336kA/m的永磁铁氧体，降低永磁铁氧体材料的生产成本。
具体实施方式
以下为本发明的具体实施方式，对本发明的技术特征做进一步的说明，但是本发明并不限于此实例。
实施例1，一种经济型永磁铁氧体材料的制备方法，包括以下步骤：
1)湿磨混料，以水为湿磨分散介质，将原料和一次添加剂同时加入球磨机中，进行2小时的湿磨混料，获得湿磨料浆，料浆粒度为0.9～1.0μm；所述主原料的组分及比例为：氧化铁粉86.79wt％，碳酸锶为13.21wt％，根据Fe2O3与SrCO3摩尔比n＝6.07进行主料的配制，氧化铁粉中Fe2O3含量为99wt％，碳酸锶中SrCO3含量为97.5wt％，所述一次添加剂为工业纯二氧化硅，一次添加剂以主原料重量计的添加比例为：CaCO30.3wt％，SiO20.14wt％；
2)一次预烧，将混料工序所得料浆在空气中进行预烧，温度为1230℃，保温时间2小时，获得一次预烧料；
3)粗粉碎，将上述一次预烧料利用球磨机粉碎，获得粗粉，同时进行粒级筛分，粒度达到3.8μm；
4)湿磨制浆，将粗粉碎所得粗粉添加二次添加剂采用球磨机进行细磨，以水为分散介质，获得细磨料浆，细磨料浆的粒度为0.6～0.7μm，所述的二次添加剂以粗粉重量计的添加比例为：CaCO30.8wt％，Al2O30.6wt％，SiO20.2wt％，H3BO30.4wt％，Cr2O30.4wt％；
5)湿压磁场成型，采用湿法磁场成型，将上述细磨得到的细磨料浆浓缩为含水为40wt％的成型料浆，在外加磁场为15kOe、成型压力为3.43MPa的条件下压制成Φ28.5mm的圆柱形生坯；
6)二次烧结，将成型所得生坯在空气中进行烧结，温度为1210℃，保温时间2小时，获得熟坯；
7)熟坯打磨，采用自动磨床将熟坯进行打磨后获得样品。
上述样品检测磁性能：剩余磁感应强度Br为412.2mT，矫顽力Hcb为308.5kA/m，内禀矫顽力Hcj为336.3kA/m，最大磁能积(BH)max为32.05kJ/m3。
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案，均落在本发明要求的保护范围。

Claims (2)

1.一种经济型永磁铁氧体材料的制备方法，其特征是，所述的方法包括以下步骤：
1)湿磨混料，以水为湿磨分散介质，将主原料和一次添加剂同时加入球磨机中，进行1～3小时的湿磨混料，获得湿磨料浆，湿磨料浆的粒度为0.9-1.0μm，所述主原料的组分及比例为：氧化铁粉86.45～86.84wt％，碳酸锶为13.55～14.16wt％，主原料中Fe2O3和SrCO3的摩尔比为5.90-6.10，氧化铁粉中Fe2O3的重量百分含量≥98％，碳酸锶中SrCO3的重量百分含量≥97％，所述一次添加剂为工业纯二氧化硅，一次添加剂以主原料重量计的添加比例为CaCO30.1-0.4wt％，SiO20.1-0.3wt％，Al2O30-0.3wt％；
2)一次预烧，将经湿磨混料得到的料浆在空气中进行预烧，温度为1150～1280℃，保温1～3小时，获得一次预烧料；
3)粗粉碎，将一次预烧料利用球磨机粉碎后进行粒级筛分获得粒度为1～75μm预烧料粗粉；
4)湿磨制浆，在粗粉碎得到的粗粉中添加二次添加剂后用球磨机进行细磨16～22小时，以水为分散介质，获得细磨料浆，细磨料浆的粒度为0.6～0.7μm，比表面积为1～12m2/g，所述的二次添加剂以粗粉重量计的添加比例为：CaCO30.8-1.2wt％，SiO20.2-0.4wt％，H3BO30.2-0.5wt％，Al2O30.2-0.4wt％，Cr2O30.2～0.4wt％；
5)湿压磁场成型，将细磨得到的细磨料浆浓缩为含水为35～55wt％的成型料浆，在外加磁场为6～18kOe、成型压力为9.8～98Mpa的条件下压制成生坯；
6)二次烧结，将成型所得生坯在空气中进行烧结，温度为1180～1210℃，保温2～5小时，获得熟坯；
7)熟坯打磨，采用自动磨床将熟坯进行打磨后获得样品。
2.如权利要求1所述的一种经济型永磁铁氧体材料的制备方法，其特征是，所述永磁铁氧体材料的剩余磁感应强度Br≥412mT，矫顽力Hcb≥308kA/m和内禀矫顽力Hcj≥336kA/m。
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