CN107986771B - 一种锰锌铁氧体磁环及其制备方法 - Google Patents

一种锰锌铁氧体磁环及其制备方法 Download PDF

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CN107986771B
CN107986771B CN201711249039.7A CN201711249039A CN107986771B CN 107986771 B CN107986771 B CN 107986771B CN 201711249039 A CN201711249039 A CN 201711249039A CN 107986771 B CN107986771 B CN 107986771B
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manganese
magnetic ring
zinc ferrite
sintering
ferrite magnetic
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李申华
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Nantong Sanjia Magnetic Industry Co ltd
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Abstract

本发明公开了一种锰锌铁氧体磁环及其制备方法,所述锰锌铁氧体磁环应用于逆变弧焊机、DC/DC转换器及电源用变压器,包括以摩尔百分含量计算的如下主成分:Fe2O3 53~54mol%;ZnO 7~9mol%;MnO 37~40mol%。通过上述方式,本发明能够满足电源变压器电感高和叠加高的要求,有利于变压器器件的储能和功率转化,提高其效率。

Description

一种锰锌铁氧体磁环及其制备方法
技术领域
本发明涉及磁环领域,特别是涉及一种锰锌铁氧体磁环及其制备方法。
背景技术
随着电子信息产业迅速的发展,作为其所用的锰锌铁氧体磁芯电子元件,要求承载的功率大、发热少、噪音小、作为逆变弧焊机中主变压器的芯体磁环提出了更高的要求,常温条件下电感高,直流叠加高。现有的锰锌铁氧体磁环的检测数据如下表:
Figure 125073DEST_PATH_IMAGE001
原逆变弧焊机电源变压器中使用的EC型锰锌铁氧体将被淘汰,取代该EC型锰锌铁氧体的锰锌铁氧体磁环,从磁路方面讲是有贡献的,但从绕线方面,对芯体的温升、散热是不利的。
我们对这些指标进行研究和分析得出,叠加电感主要提高芯体磁环的饱和磁通密度,电感对应的磁环芯体的导磁率。
综上所述,为解决这些问题和客户的要求,应制作一种锰锌铁氧体的磁环和材料,以达到变压器使用下,常温下电感高和叠加高的要求;同时,克服使用磁环芯体带来的不利因数。
发明内容
本发明主要解决的技术问题是:针对现有技术的不足,提供一种锰锌铁氧体磁环,能够满足电源变压器常温下电感高和叠加高的要求,有利于变压器器件的储能和功率转化,提高其效率。
为解决上述技术问题,本发明采用的一个技术方案是:提供一种锰锌铁氧体磁环,应用于逆变弧焊机、DC/DC转换器及电源用变压器,包括以摩尔百分含量计算的如下主成分:
Fe2O3 53~54mol%;
ZnO 7~9mol%;
MnO 37~40mol%。
在本发明一个较佳实施例中,进一步包括以摩尔百分含量计算的如下添加剂中的一种或多种:
Co2O3 0.3~0.5mol%;
Nb2O5 0.02~0.04mol%;
CaCO3 0.04~0.08mol%;
ZrO2 0.01~0.03mol%;
SiO2 0.005~0.1mol%;
TiO2 0.05~0.10 mol%;
NiO 0.02~0.1mol%。
在本发明一个较佳实施例中,在H=10KHZ,0.1V,0.5A,25℃条件下,所述锰锌铁氧体磁环的叠加电感大于35%。
在本发明一个较佳实施例中,在H=10KHZ,0.1V,25℃条件下,所述锰锌铁氧体磁环的电感为7-12.5uH。
在本发明一个较佳实施例中,所述Fe2O3的纯度为99.5%,比表面积为4.0 m2/g。
还提供一种锰锌铁氧体磁环的制备方法,包括如下步骤:首先,将主成分转换成重量百分比,计算出各种主成分的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧;然后,加入各添加剂,经振磨后再用砂磨机砂磨,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结成型。
在本发明一个较佳实施例中,所述预烧温度为950℃。
在本发明一个较佳实施例中,所述砂磨时间为90分钟。
在本发明一个较佳实施例中,所述烧结温度为1320℃。
本发明的有益效果是:通过反复的试验和研究,确定磁环芯体的主成分和添加剂,并进行了一系列的改良配方,确定各主成分和添加剂的含量范围,提高了直流叠加和电感;能够满足电源变压器温升低和常温下电感高且叠加高的要求,有利于电源变压器器件的储能和功率转化,提高其效率,延长其使用寿命。
具体实施方式
下面对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易于被本领域技术人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
实施例一
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.4mol%,MnO 38.53mol%,ZnO 8.07mol%。制备时,首先,将主成分转换成重量百分比,计算出各种主成分的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,预烧料经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品1#。
样品1#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感,使用仪器4284A电感电桥测试仪检测,具体数据见表1:
表1
Figure 917579DEST_PATH_IMAGE002
实施例二
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.14mol%,MnO 38.35mol%,ZnO 8.03mol%,Co2O3 0.38mol%,NiO 0.1mol%。制备时,首先,将Fe2O3、MnO和ZnO转换成重量百分比,计算出各种原材料的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,将预烧粉掺入Co2O3和NiO, 经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品2#。
样品2#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感;使用仪器4284A电感电桥测试仪检测,其具体数值如表2:
表2
Figure 635000DEST_PATH_IMAGE003
实施例三
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.09mol%,MnO 38.31mol%,ZnO 8.02mol%,Co2O3 0.38mol%,NiO 0.1mol%,TiO2 0.10mol%。制备时,首先,将Fe2O3、MnO和ZnO转换成重量百分比,计算出各种原材料的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,将预烧粉掺入Co2O3、NiO和TiO2, 经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品3#。
样品3#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感;使用仪器4284A电感电桥测试仪检测,其具体数值如表3:
表3
Figure 407040DEST_PATH_IMAGE004
实施例四
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.09mol%,MnO 38.31mol%,ZnO 8.02mol%,Co2O3 0.38mol%,NiO 0.1mol%,TiO2 0.10mol%,Nb2O5 0.025mol%,CaCO30.05mol%,ZrO2 0.01mol%,SiO2 0.005mol%。制备时,首先,将Fe2O3、MnO和ZnO转换成重量百分比,计算出各种原材料的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,将预烧粉掺入Co2O3、NiO、TiO2、Nb2O5、CaCO3、ZrO2 和SiO2, 经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品4#。
样品4#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感;使用仪器4284A电感电桥测试仪检测,其具体数值如表4:
表4
Figure 96778DEST_PATH_IMAGE005
实施例五
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.09mol%,MnO 38.31mol%,ZnO 8.02mol%,Co2O3 0.38mol%,NiO 0.1mol%,TiO2 0.10mol%,Nb2O5 0.025mol%,CaCO30.05mol%,ZrO2 0.01mol%,SiO2 0.005mol%。使用高纯、高比表面积的原材料:Fe2O3的纯度为99.5%,比表面积为4.0 m2/g,四氧化三锰的纯度为99.6%,比表面积为15m2/g。制备时,首先,将Fe2O3、MnO和ZnO转换成重量百分比,计算出各种原材料的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,将预烧粉掺入Co2O3、NiO、TiO2、Nb2O5、CaCO3、ZrO2 和SiO2, 经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品5#。
样品5#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感;使用仪器4284A电感电桥测试仪检测,其具体数值如表5:
表5
Figure 355459DEST_PATH_IMAGE006
实施例六
一种锰锌铁氧体磁环,应用于制作逆变弧焊机、DC/DC转换器及电源用变压器,在电路中起储能、功率转换的作用,以摩尔百分比计,包括:Fe2O3 53.09mol%,MnO 38.31mol%,ZnO 8.02mol%,Co2O3 0.38mol%,NiO 0.1mol%,TiO2 0.10mol%,Nb2O5 0.025mol%,CaCO30.05mol%,ZrO2 0.01mol%,SiO2 0.005mol%。使用高纯、高比表面积的原材料:Fe2O3的纯度为99.5%,比表面积为4.0 m2/g,四氧化三锰的纯度为99.6%,比表面积为15m2/g。制备时,首先,将Fe2O3、MnO和ZnO转换成重量百分比,计算出各种原材料的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧,预烧温度为950℃;然后,将预烧粉掺入Co2O3、NiO、TiO2、Nb2O5、CaCO3、ZrO2 和SiO2, 经振磨后再用砂磨机砂磨90分钟,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑中,原升温区在空气中烧结,改为氮气烧结,其它仍按照平衡氧分压气氛曲线烧结,温度为1320℃,烧结成磁环样品5#。
样品5#绕19Ts后,在10KHZ,0.1V,常温,加电流2A条件下,测试叠加电感;在绕1Ts,10KHZ,0.1V,常温条件下,测试电感;使用仪器4284A电感电桥测试仪检测,其具体数值如表6:
表6
Figure 560175DEST_PATH_IMAGE007
从上述测试的数据中,样品1#、2#、3#未有达到锰锌铁氧体磁芯的高叠加电感值的要求,4#、5#、6#样品磁芯,绕19Ts后,在10KHZ,0.1V,常温,加电流0.5A条件下,用4284ALCR检测仪测试,常温下的叠加值都在35%以上,显示出优良的特性。
综上所述,经过一系列的试验,生产出这种高叠加值、温升低的锰锌铁氧体磁环。不难看出,除了主成分和负成分的含量对叠加影响外,原材料和氮气保护烧结对提高磁芯的叠加、电感和温升有很大的帮助。
根据4#、5#、6#样品磁芯的检测结果,我们确定了该锰锌铁氧体磁环的最佳主要成分、添加剂和比表面积好的原材料Fe2O3和Mn3O4,已达到高Bs和高电感值的磁环,保证磁环优良的叠加特性,满足了批量生产条件,同时也满足了客户的要求,具体成分见下表7:
表7
Figure 634442DEST_PATH_IMAGE008
根据表7主成分和添加剂含量,以摩尔百分比计算(Nb2O5、 CaCO3、ZrO2、SiO2、Co2O3、NiO、TiO2微量可不计),最终的主成分和添加剂的含量见表8:
表8
Figure 742469DEST_PATH_IMAGE009
实施例说明
由于Fe2O3和ZnO的百分含量的高和低,对磁环饱和磁通密度的高低、功率损耗高低都有影响,当Fe2O3高于54%mol时,饱和磁通密度高,但功耗有恶化的倾向,当Fe2O3低于53mol%,饱和磁通密度降低。
当ZnO的含量低于7mol%,饱和磁通密度降低,同时,损耗增大。当ZnO的含量高于9mol%,饱和磁通密度降低,损耗也增大。因此,我们选择了Fe2O3:53.0~54.0mol%该范围;ZnO:7.0~9.0mol%该范围。
添加剂的添加,能够实现提升饱和磁通密度、降低功耗,我们优先了Co2O3和NiO,适量的添加Co2O3能够使功耗向低温移动,同时在低温范围内损耗的变动减少。有利于解决磁环芯体的温升问题。
另一方面,由于Co2+的各向异性常数为正和Fe2+各向异性常数为负,互相抵消,提高磁导率。我们优选了Co2O3的添加量为0.3~0.5mol%。低于0.3mol%磁导率不够,高于0.5mol%磁导率偏高,并且功耗增大。
NiO的加入,能使磁环芯体的饱和磁通密度升高,居里温度升高。为了得到饱和磁通密度的改善和功耗降低,NiO的添加量优选为0.02-0.1mol%。
TiO2的添加,将进入晶粒内,有利于提高芯体的电阻率,降低功耗的效果,当过量的TiO2的加入时,不连续异常晶粒长大,导致功耗明显恶化,饱和磁通密度降低,为了改善饱和磁通密度和降低功耗的效果,我们设定了TiO2的添加范围为0.05~0.10 mol%。
SiO2和CaCO3的加入,Si和Ca能够进入境界,形成高电阻层,提高芯体的电阻率,降低功率损耗;同时,又能作为烧结助溶剂,提高烧结密度,也提高饱和磁通密度。但是,过量的SiO2和CaO的进入,会出现不连续异常晶粒生长,导致功耗恶化。因此,我们设定了SiO2的添加范围:0.005~0.1mol%,CaCO3的添加范围:0.04~0.08mol%。
在烧结过程中,我们将烧结的升温段的空气烧结,改为全氮气烧结,烧结体得到很大的提高密度,烧结体磁环的晶粒比较均匀,功率损耗、导磁率和饱和磁通密度得到很大的提高和改善,这在国内文献中还没有使用过。
本发明揭示了一种锰锌铁氧体磁环,通过反复的试验和研究,确定磁环芯体的主成分和添加剂,并进行了一系列的改良配方,确定各主成分和添加剂的含量范围,提高了直流叠加和电感;降低了磁环的温升,能够满足电源变压器常温下电感高且叠加高的要求,有利于电源变压器器件的储能和功率转化,提高其效率,延长其使用寿命。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (4)

1.一种锰锌铁氧体磁环,应用于逆变弧焊机、DC/DC转换器及电源用变压器,其特征在于,包括以摩尔百分含量计算的如下主成分:
Fe2O3 53~54mol%;
ZnO 7~9mol%;
MnO 37~40mol%;
进一步包括以摩尔百分含量计算的如下添加剂:
Co2O3 0.3~0.5mol%;
Nb2O5 0.02~0.04mol%;
CaCO3 0.04~0.08mol%;
ZrO2 0.01~0.03mol%;
SiO2 0.005~0.1mol%;
TiO2 0.05~0.10 mol%;
NiO 0.02~0.1mol%;
所述锰锌铁氧体磁环的制备方法,包括如下步骤:首先,将主成分转换成重量百分比,计算出各种主成分的重量,进行配料称量;接着,经红振压片、进入预烧炉预烧;然后,加入各添加剂,经振磨后再用砂磨机砂磨,进行制浆、加胶造粒;最后,压制成型坯件,放在氮气隧道窑,按照平衡氧分压气氛曲线烧结成型;所述烧结温度为1320℃;
在H=10KHZ,0.1V,0.5A,25℃条件下,所述锰锌铁氧体磁环的叠加电感大于35%;
在H=10KHZ,0.1V,25℃条件下,所述锰锌铁氧体磁环的电感为7-12 .5uH。
2.根据权利要求1所述的锰锌铁氧体磁环,其特征在于,所述Fe2O3的纯度为99.5%,比表积为4.0 m2/g。
3.根据权利要求1所述的锰锌铁氧体磁环,其特征在于,所述预烧温度为950℃。
4.根据权利要求1所述的锰锌铁氧体磁环,其特征在于,所述砂磨时间为90分钟。
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