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CN102217011A - 铁氧体制造方法 - Google Patents

铁氧体制造方法 Download PDF

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CN102217011A
CN102217011A CN2009801311753A CN200980131175A CN102217011A CN 102217011 A CN102217011 A CN 102217011A CN 2009801311753 A CN2009801311753 A CN 2009801311753A CN 200980131175 A CN200980131175 A CN 200980131175A CN 102217011 A CN102217011 A CN 102217011A
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ferrite
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heat treatment
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柳秉勋
成元模
秦埈植
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Kespion Co Ltd
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EMW Co Ltd
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Abstract

本发明公开一种在宽的频率范围也可以实现高效率的铁氧体制造方法。包括，以3∶2∶24的比率混合硝酸钡(Ba(NO3)2)，硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)而形成液态混合物的步骤；以氢氧化钠(NaOH)共同沉淀上述混合物而金属化的步骤；洗涤及干燥共同沉淀的混合物的步骤；对洗涤及干燥的混合物进行热处理的步骤；及对混合物添加氧化铝(Al2O3)的步骤。根据上述构成，可以降低诱电率、透磁率、诱电损失及透磁损失，从而能够实现高效率的铁氧体。

Description

铁氧体制造方法
技术领域
本发明涉及一种天线，尤其涉及提高频率的范围而提高天线的效率的铁氧体的制造方法。
背景技术
通常地，无线设备是指不受场所的限制，能够在任意地点通过无线通信收发信息的设备，包括移动电话、个人电脑、便携式电脑等。这种无线设备上设置有以无线收发电子信息的天线，在该天线上为了以无线收发信息，采用RF(RadioFrequency)磁性元件。
上述RF磁性元件可利用多种类型的铁氧体(ferrite)而实现，其中以Ba3Co2Fe24O41构成的Z-类型或者六角晶(Hexa)铁氧体是可在数百MHz上使用的铁氧体。这种Z-类型或者六角晶铁氧体由于其透磁率和诱电率高而有利于天线的小型化。
但是，利用上述Z-类型或者六角晶铁氧体的RF磁性元件在数百MHz以上频率由于其透磁损失值和诱电损失值变大而不宜作为RF磁性元件使用。并且，通过作为上述Z-类型或者六角晶铁氧体的特性的高透磁率和高诱电率而实现的小型天线的情况下，由于减少的横截面积而导致效率降低。因此，要求在降低透磁损失值和诱电损失值的同时，调节透磁率和诱电率，使其以上述RF磁性元件提高频率范围，从而提高天线的效率的方案。
发明内容
本发明是考虑到上述问题而提出的，其目的在于，提供一种铁氧体的制造方法，以降低透磁损失值和诱电损失值而扩大频率的范围。
本发明的另一目的在于，提供一种铁氧体的制造方法，以降低透磁率和诱电率而提高天线效率。
为了实现上述目的，根据本发明的铁氧体制造方法包括，形成具有磁性的液态混合物的步骤；使上述混合物金属化的步骤；将上述金属化的混合物洗涤及干燥的步骤，对上述洗涤及干燥的混合物进行热处理的步骤及，在上述热处理的混合物添加氧化铝(Al2O3)的步骤。
根据本发明的实施例，上述液态混合物通过以3∶2∶24的比率混合硝酸钡(Ba(NO3)2)，硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)而形成。以上述比率混合的上述液态的混合物通过氢氧化钠(NaOH)共同沉淀而金属化。
*以蒸馏水洗涤上述金属化的混合物，并在110℃至130℃之间的温度干燥24小时。如此干燥的混合物在900～1100℃之间的温度经过第一次热处理后，在1250～1350℃间的温度经过第二次热处理。此时，上述氧化铝在经过上述第一次热处理步骤之后，与经过上述第一次热处理的混合物以数％至数十％的重量比进行混合。通过上述一系列步骤形成的铁氧体的透磁率、诱电率、透磁损失及诱电损失都低。
根据本发明的另一侧面的铁氧体的制造方法，包括准备以Ba3Co2Fe24O41形成的混合体的步骤及，在上述混合体以数％至数十％的比率混合由Al2O3构成的添加物的步骤。在此，包括以3∶2∶24的比率混合硝酸钡(Ba(NO3)2)、硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)而形成液态混合物的步骤；共同沉淀上述液态混合物的步骤；洗涤及干燥上述共同沉淀的混合物的步骤及，对上述干燥的混合物分两步骤进行热处理的步骤，在上述添加物添加步骤中，添加到经过第一次热处理的混合物而经过两次热处理。
根据上述构成的本发明，在由Ba3Co2Fe24O41形成的混合体中混合氧化铝(Al2O3)，从而降低制造的铁氧体的透磁损失和诱电损失。由此，上述铁氧体能够在数百MHz以上的范围，即，在数GHz的频率范围也可以采用。
并且，通过在上述铁氧体添加氧化铝，从而降低制造的铁氧体的透磁率及诱电率而提高采用的天线的效率。并且，通过调节添加到上述铁氧体的氧化铝的比率，从而将上述铁氧体的诱电率及透磁率的值调节成希望值。
附图说明
图1为了说明根据本发明的铁氧体的制造方法的时序图。
图2是概略地表示根据图1制造的铁氧体的剖视图。
图3是表示根据本发明制造的铁氧体的透磁率和诱电率的图表。
图4是表示根据本发明制造的铁氧体的透磁损失和诱电损失的图表。
图5是表示根据本发明制造的铁氧体的反射损失的图表。
具体实施方式
下面，参照附图说明本发明的一优选实施例。
图1为了说明根据本发明的铁氧体的制造方法的时序图。
图2表示根据图1的制造方法制造的Z-类型铁氧体。
参照图1，根据本发明的以实施例的铁氧体(ferrite)制造方法包括液态混合物形成步骤(S10)；金属化步骤(S20)；洗涤及干燥步骤(S30)；热处理步骤(S40)及添加物添加步骤(S50)。下面依次说明这些步骤。
如图1所示，首先，形成具有磁性的液态混合物(S10)。在此，上述混合物通过硝酸钡(Ba(NO3)2)，硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)以既定比率混合而形成。此时，上述硝酸钡(Ba(NO3)2)，硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)以3∶2∶24的比率混合。
如上述形成液态混合物(S10)之后，将上述混合物金属化(S20)。为了这些液态混合物的金属化，利用作为在沉淀反应时未达到溶解度的其它物质或离子一同沉淀的现象的共同沉淀法(coprecipitationmethod)而将其金属化(S20)。在本发明举例利用在上述混合物混合氢氧化钠(NaOH)的共同沉淀法。但是，并非限于此，可以采用从上述液态混合物提取金属的多种方法中的任意一种。
上述共同沉淀的混合物经过洗涤及干燥(S30)。具体地，上述洗涤及干燥步骤(S30)，用蒸馏水洗涤上述共同沉淀而金属化的混合物的浆体。之后，以110℃至130℃之间的温度将上述洗涤的混合物干燥24小时。在实施例中举例在未图示的干燥机120℃的温度对上述洗涤的混合物进行干燥。
如上述经过洗涤及干燥的混合物经过热处理(S40)。上述热处理步骤(S40)由两步骤构成，第一热处理步骤(S41)以900℃至1100℃之间的温度进行，第二热处理步骤(S42)以1250℃至1350℃之间的温度进行。在本实施例中，举例第一热处理步骤(S41)在1000℃下进行，第二热处理步骤(S42)在1320℃下进行。
另外，在上述第一热处理步骤(S41)之后，进行在经过上述第一次热处理的混合物添加添加物的步骤(S50)。上述添加物为氧化铝(Al2O3)，与上述第一次热处理的混合物以数％至数十％之间的重量比添加。在此，作为上述添加物的氧化铝为了降低制造的铁氧体的透磁损失值和诱电损失值，并降低透磁率和诱电率而添加。
如上所述，氧化铝添加到经过第一次热处理的混合物后(S50)经过第二次热处理(S42)，就可以制造出如图2中表示的铁氧体(1)。
根据上述制造方法制造的铁氧体(1)是在由Ba3Co2Fe24O41构成的混合体以数％至数十％的混合比率添加氧化铝的铁氧体。
下述表1是比较根据作为以上述制造步骤制造的铁氧体(1)的添加物的氧化铝的两的性能的表。
表1
  氧化铝的比率(％)   0％   1％   10％   20％
  天线尺寸(mm)   33   45   65   69
  峰值增益(dBi)   -4.8461   0.68978   4.6384   4.9542
  效率(％)   10.893   38.877   87.65   95.04
如上述表1所示，比起上述以0％混合氧化铝的铁氧体(1)，上述氧化铝的添加比率增加到1％，10％及20％，上述天线的尺寸不断增加，对天线的特定方向的增益值的峰值增益也增加。不仅如此，上随着述氧化铝的混合比率增加，上述铁氧体(1)的效率也急剧增加。由此，通过增加采用根据上述制造方法制造的铁氧体(1)的天线的横截面积而提高天线的效率。
并且，参照图3及图4，表示根据上述制造方法制造的铁氧体(1)的透磁率、诱电率、透磁损失及诱电损失的图表。透磁率、诱电率、透磁损失及诱电损失是表示天线的性能的指标，上述透磁率是表示物质的磁性的量，上述诱电率是表示可作为诱电体的点特性而储存的电荷量的指标。并且，上述透磁损失是磁化损失量，上述诱电损失是表示在诱电体中以热损失的能源损失量。
如图3所示，随着上述氧化铝的添加比率增加到0％、1％、10％及20％，透磁率和诱电率降低的同时，并与频率的范围不相关而保持一定。不仅如此，如图4所示，可以得知上述氧化铝的添加比率增加对上述铁氧体(1)的透磁损失及诱电损失降低带来影响。因此，根据对构成上述铁氧体(1)的混合体的Ba3Co2Fe24O41添加氧化铝，能够调节上述铁氧体(1)的透磁率和诱电率的同时，由于透磁损失和诱电损失的减少，能够在较宽的范围频率中采用。
图5是表示根据本发明制造的铁氧体的反射损失(ReturnLoss)的图表。
如图5所示，随着上述氧化铝的添加比率增加到0％、1％、10％及20％，上述反射损失值逐渐降低。由于这种反射损失值的降低可具备在数GHz的宽带环境下也可以采用的铁氧体特性。
如上所述，虽然参照本发明的优选实施例进行说明，但是本发明所属技术领域的技术人员应当理解，在不脱离权利要求中记载的本发明的思想及领域的范围内，可以对本发明进行多种修改及变更。

Claims (9)

1.铁氧体制造方法，其特征在于，包括，形成具有磁性的液态混合物的步骤；使上述混合物金属化的步骤；将上述金属化的混合物洗涤及干燥的步骤；对上述洗涤及干燥的混合物进行热处理的步骤；及在上述热处理的混合物添加氧化铝(Al2O3)的步骤。
2.根据权利要求1所述的铁氧体制造方法，其特征在于，上述液态混合物形成步骤为，以3∶2∶24的比率混合硝酸钡(Ba(NO3)2)，硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)。
3.根据权利要求1所述的铁氧体制造方法，其特征在于，上述金属化步骤是，通过氢氧化钠(NaOH)使上述液态的混合物共同沉淀。
4.根据权利要求1所述的铁氧体制造方法，其特征在于，上述洗涤及干燥步骤包括以蒸馏水洗涤上述混合物的步骤；及在110℃至130℃之间的温度干燥24小时的步骤。
5.根据权利要求1所述的铁氧体制造方法，其特征在于，上述热处理步骤包括，使上述干燥的混合物在900～1100℃之间的温度经过第一次热处理的步骤；及使经过上述第一次热处理的混合物在1250～1350℃间的温度经过第二次热处理。
6.根据权利要求5所述的铁氧体制造方法，其特征在于，上述氧化铝添加步骤，在经过上述第一次热处理步骤之后，将上述经过第一次热处理的混合物以数％至数十％的重量比进行混合。
7.一种铁氧体的制造方法，其特征在于，包括准备由Ba3Co2Fe24O41形成的混合体的步骤，及在上述混合体以数％至数十％的比率混合由Al2O3构成的添加物的步骤。
8.根据权利要求7所述的铁氧体制造方法，其特征在于，包括以3∶2∶24的比率混合硝酸钡(Ba(NO3)2)、硝酸钴(Co(NO3)2·6H2O)及硝酸铁(Fe(NO3)3·9H2O)而形成液态混合物的步骤；共同沉淀上述液态混合物的步骤；洗涤及干燥上述共同沉淀的混合物的步骤及，对上述干燥的混合物分两步骤进行热处理的步骤。
9.根据权利要求8所述的铁氧体制造方法，其特征在于，上述添加物混合步骤是，在上述两步骤热处理步骤中，在完成第一次热处理步骤的混合物中混合上述添加物。
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