CN108017382B - MnZn铁氧体材料及其制备方法 - Google Patents

MnZn铁氧体材料及其制备方法 Download PDF

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CN108017382B
CN108017382B CN201711259290.1A CN201711259290A CN108017382B CN 108017382 B CN108017382 B CN 108017382B CN 201711259290 A CN201711259290 A CN 201711259290A CN 108017382 B CN108017382 B CN 108017382B
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冯斌
段庆娃
王京平
刘关生
黄小刚
练炜科
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Guangdong Foshan Ceramic Research Institute Holding Group Co., Ltd
GUANGDONG FOSHAN JINGANG MAGNETIC INDUSTRY Co.,Ltd.
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Guangdong Foshan Jingang Magnetic Industry Co ltd
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Abstract

本发明公开了一种MnZn铁氧体材料,包括主料和辅料,其中,主料包括:Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%;辅料包括:CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%。相应的,本发明还提供一种MnZn铁氧体材料的制备方法。本发明MnZn铁氧体材料具有宽温低THD、宽频低THD、及高直流叠加性能,满足特殊地理位置及环境使用。

Description

MnZn铁氧体材料及其制备方法
技术领域
本发明涉及软磁材料领域,特别涉及一种MnZn铁氧体材料及其制备方法。
背景技术
MnZn铁氧体是最重要的软磁铁氧体之一,高磁导率软磁MnZn铁氧体材料是应用非常广泛的一种功能材料,在宽频变压器、低频变压器、小型环形脉冲变压器、广播、电视、电子仪表、计算机和微型电感器等领域中得到了广泛的应用。随着信息技术、通讯技术的发展,应用地理位置及环境的要求,市场急需一种多功能的软磁铁氧体材料。
目前,行业内此类材料有两种:一种是低THD材料,其THD性能材料只能满足常温需求(25±3℃),但是在-40℃~85℃宽温范围性能不能满足要求,且没有综合材料的宽频低THD性能和高直流叠加性能。另外一种是高直流叠加性能材料,但其又不具有宽温低THD、宽频低THD性能。此种材料在特殊环境下使用时都会安装空调、抗干扰等环境辅助设备。
即,现有材料只能满足单一条件下的应用,而对于偏冷、偏热、高频、低频、电流干扰等复杂环境下却不能满足使用。
发明内容
本发明所要解决的技术问题在于,提供一种MnZn铁氧体材料,具有宽温低THD、宽频低THD、及高直流叠加性能,满足特殊地理位置及环境使用。
本发明所要解决的技术问题在于,提供一种MnZn铁氧体材料的制备方法,以及MnZn铁氧体制备方法,工艺简单,成本较低,可实施性强。
为达到上述技术效果,本发明提供了一种MnZn铁氧体材料,包括主料和辅料,其中,
主料包括:Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%;
辅料包括:CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%;
所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(20%~80%):(20%~80%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(30%~70%):(30%~70%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(5%~95%):(5%~95%)。
作为上述方案的改进,主料包括:Fe2O351~55mol%、MnO22~26mol%、ZnO18~20mol%、Co2O31~5mol%。
作为上述方案的改进,辅料包括:CuO、Bi2O3组0.02~0.05wt%、CaO、V2O5组0.03~0.12wt%、TiO2、NiO组0.03~0.09wt%。
作为上述方案的改进,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(30%~70%):(30%~70%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(40%~60%):(40%~60%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(15%~85%):(15%~85%)。
作为上述方案的改进,使用温度在-40℃~85℃范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;
使用频率在1KHz~500KHz范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;
叠加电流在0~50A范围内变化时,所述MnZn铁氧体材料的电感变化小于10%。
相应的,本发明还提供一种MnZn铁氧体材料的制备方法,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧;
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨。
作为上述方案的改进,砂磨过程中,物料的D50控制在0.8~0.9微米。
相应的,本发明还提供一种MnZn铁氧体的制备方法,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧;
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨;
3、将砂磨后的物料经过喷雾造粒,形成颗粒料;
4、将颗粒料压制成型,得到密度为2.0-4.0g/cm3的生坯;
5、将生坯采用氮气保护烧结,在1300-1500℃保温烧结4-10小时,得到初产品;
6、将初产品的端面磨成镜面,并磨气隙,得到产品。
作为上述方案的改进,砂磨过程中,物料的D50控制在0.8~0.9微米。
作为上述方案的改进,预烧温度为950-980℃;
所述颗粒料的颗粒度为80目~200目;
所述生坯的密度为2.8-3.2g/cm3
实施本发明具有如下有益效果:
本发明重新设计软磁材料的配方,使得MnZn铁氧体材料具有优异的宽温低THD、宽频低THD性能,具体是:使用温度在-40℃~85℃范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;使用频率在1KHz~500KHz范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB。
而且,本发明MnZn铁氧体材料具有高直流叠加性能,当叠加电流在0~50A范围内变化时,所述MnZn铁氧体材料的电感变化小于10%。
因此,本发明是集宽温低THD、宽频低THD及高直流叠加性能,三种优良特性于一身的新型多功能材料,可以满足特殊地理位置及环境使用,在偏冷、偏热、高频、低频、电流干扰等复杂环境下均能满足使用,而且在特殊地理环境下使用,也不需要安装空调、抗干扰等环境辅助设备。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将对本发明作进一步地详细描述。
本发明提供了一种MnZn铁氧体材料,包括主料和辅料,其中,
主料包括:Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%;
辅料包括:CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%。
本发明的主料和辅料均是以固体形态加入,其中主料是以摩尔百分比加入的,辅料是以重量百分比加入。
作为MnZn铁氧体材料优选的实施方式,主料包括:Fe2O351~55mol%、MnO22~26mol%、ZnO18~20mol%、Co2O31~5mol%。辅料包括:CuO、Bi2O3组0.02~0.05wt%、CaO、V2O5组0.03~0.12wt%、TiO2、NiO组0.03~0.09wt%。
Fe2O3与ZnO、MnO等氧化物,烧结反应后生成尖晶石结构铁氧体
MeFe3O4,其中Me为(Mn2+、Zn2+、Cu2+、Ni2+、Co2+等)的单一或多种离子组合;
其中Fe2O3与ZnO、MnO烧结生成主成分锰锌铁氧体。具备锰锌铁氧体的基本性能。
CuO、Bi2O3组,CuO与Fe2O3反应生成CuFe3O4,具有较低熔点,促进主成分在较低温度下烧结;Bi2O3辅料加入可在较低温度促进主成分晶粒生长;此组份的加入可达到降低烧结温度,提高产品密度,提高产品性能的目的。
CaO、V2O5组,CaO加入后Ca原子富集于晶界,形成高电阻率的晶界,可降低主成分的涡流损耗,提升产品THD性能;V2O5可阻止晶粒过度增长,使晶粒大小均匀;此组份的加入可提升产品的宽频THD性能,直流叠加性能。
TiO2、NiO组,该组分与Co2O3一起改善主成分的宽温THD性能。
具体的,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(20%~80%):(20%~80%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(30%~70%):(30%~70%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(5%~95%):(5%~95%)。
优选的,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(30%~70%):(30%~70%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(40%~60%):(40%~60%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(15%~85%):(15%~85%)。
普通的软磁材料,使用温度为25±3℃,使用频率为5KHz~100KHz。最重要的是,一般低THD材料不具备高直流叠加性能。
本发明重新设计软磁材料的配方,使得MnZn铁氧体材料具有优异的宽温低THD、宽频低THD性能,综合性能好,具体是:
(1)材料的使用温度大幅拓宽
由一般材料25±3℃拓宽到-40℃~85℃。
使用温度在-40℃~85℃范围内变化时,本发明MnZn铁氧体材料的THD变化小于5dB。
(2)材料的使用频率大幅拓宽
由一般材料5KHz~100KHz拓宽到1KHz~500KHz。
使用频率在1KHz~500KHz范围内变化时,本发明MnZn铁氧体材料的THD变化小于5dB。
(3)材料具有了高直流叠加性能
一般低THD材料不具备高直流叠加性能,本发明MnZn铁氧体材料具有高直流叠加性能,当叠加电流在0~50A范围内变化时,所述MnZn铁氧体材料的电感变化小于10%。
因此,本发明是集宽温低THD、宽频低THD及高直流叠加性能,三种优良特性于一身的新型多功能材料,可以满足特殊地理位置及环境使用,在偏冷、偏热、高频、低频、电流干扰等复杂环境下均能满足使用,而且在特殊地理环境下使用,也不需要安装空调、抗干扰等环境辅助设备。
需要说明的是,THD(total harmonic distortion,总谐波失真):是声音设备产生的谐波的水平。一般来说,高质量设备的THD值很低。很多电子管设备的THD非常高,但晶体管设备必须具有较低的THD,因为它们多余的谐波会使声音听起来很不舒服。
相应的,本发明还提供一种MnZn铁氧体材料的制备方法,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧。
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨。
其中,砂磨过程中,物料的D50控制在1~5微米,优选为0.8~0.9微米,具有以下效果:晶粒大小的适当控制,首先有利于粉料制成后压制性能的提升。另外其对烧结温度有较大的影响,颗粒越小,材料活性越好,烧结温度相应降低,较容易获得晶粒大小一致的微观结构,产品生产过程中可节能并获得较好的性能。
相应的,本发明还提供一种MnZn铁氧体的制备方法,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧。
优选的,预烧温度为950-980℃,预烧时将混合后的氧化物烘干,装于匣砵中,在预烧炉中预烧。预烧可使主成分部分尖晶石化,降低烧结收缩率。
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨。砂磨过程中,物料的D50控制在1~5微米,优选为0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成颗粒料。优选的,所述颗粒料的颗粒度为80目~200目。
4、将颗粒料压制成型,得到密度为2.0-4.0g/cm3的生坯。优选的,所述生坯的密度为2.8-3.2g/cm3,合理的生坯密度可改善产品烧结时的收缩变形,减少气孔率,增加产品密度,提升产品性能。
5、将生坯采用氮气保护烧结,在1300-1500℃保温烧结4-10小时,得到初产品。
6、将初产品的端面磨成镜面,并磨气隙,得到产品。
下面以具体实施例进一步阐述本发明
实施例1
(一)配方:
主料包括:Fe2O350mol%、MnO24mol%、ZnO21mol%、Co2O35mol%;
辅料包括:CuO、Bi2O3组0.01wt%、CaO、V2O5组0.02wt%、TiO2、NiO组0.02wt%。其中,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为20%:80%;所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为30%:70%;所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为5%:95%。
(二)制备方法
1、将主料按配方混合,混合均匀后在900℃条件下进行预烧。
2、再加入辅料,进行砂磨,D50控制在0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成80目~200目的颗粒料。
4、将颗粒料压制成EP8.2产品,生坯密度控制在2.5g/cm3
5、将生坯采用氮气保护烧结,根据配方调整平衡氧分压,在1300℃保温烧结6小时,得到初产品。
6、将初产品用平面磨床研磨端面成镜面,并磨气隙,使用APX525,HP4284A仪器测试性能。
实施例2
(一)配方:
主料包括:Fe2O352.3mol%、MnO26.1mol%、ZnO19.6mol%、Co2O32mol%;
辅料包括:CuO、Bi2O3组0.02wt%、CaO、V2O5组0.035wt%、TiO2、NiO组0.08wt%。其中,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为30%:70%;所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为40%:60%;所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为20%:80%。
(二)制备方法
1、将主料按配方混合,混合均匀后在950℃条件下进行预烧。
2、再加入辅料,进行砂磨,D50控制在0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成80目~200目的颗粒料。
4、将颗粒料压制成EP8.2产品,生坯密度控制在3.0g/cm3
5、将生坯采用氮气保护烧结,根据配方调整平衡氧分压,在1390℃保温烧结7小时,得到初产品。
6、将初产品用平面磨床研磨端面成镜面,并磨气隙,使用APX525,HP4284A仪器测试性能。
实施例3
(一)配方:
主料包括:Fe2O353.5mol%、MnO25.7mol%、ZnO18.8mol%、Co2O32mol%;
辅料包括:CuO、Bi2O3组0.03wt%、CaO、V2O5组0.04wt%、TiO2、NiO组0.055wt%。其中,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为40%:60%;所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为50%:50%;所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为30%:70%。
(二)制备方法
1、将主料按配方混合,混合均匀后在980℃条件下进行预烧。
2、再加入辅料,进行砂磨,D50控制在0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成80目~200目的颗粒料。
4、将颗粒料压制成EP8.2产品,生坯密度控制在3.0g/cm3
5、将生坯采用氮气保护烧结,根据配方调整平衡氧分压,在1390℃保温烧结7小时,得到初产品。
6、将初产品用平面磨床研磨端面成镜面,并磨气隙,使用APX525,HP4284A仪器测试性能。
实施例4
(一)配方:
主料包括:Fe2O354mol%、MnO21mol%、ZnO21mol%、Co2O34mol%;
辅料包括:CuO、Bi2O3组0.04wt%、CaO、V2O5组0.05wt%、TiO2、NiO组0.06wt%。其中,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为55:45%;所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为60:40%;所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为45%:55%。
(二)制备方法
1、将主料按配方混合,混合均匀后在1020℃条件下进行预烧。
2、再加入辅料,进行砂磨,D50控制在0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成80目~200目的颗粒料。
4、将颗粒料压制成EP8.2产品,生坯密度控制在3.0g/cm3
5、将生坯采用氮气保护烧结,根据配方调整平衡氧分压,在1400℃保温烧结8小时,得到初产品。
6、将初产品用平面磨床研磨端面成镜面,并磨气隙,使用APX525,HP4284A仪器测试性能。
实施例5
(一)配方:
主料包括:Fe2O356mol%、MnO27mol%、ZnO16mol%、Co2O31mol%;
辅料包括:CuO、Bi2O3组0.05wt%、CaO、V2O5组0.04wt%、TiO2、NiO组0.08wt%。其中,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为80%:20%;所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为70%:30%;所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为95%:5%。
(二)制备方法
1、将主料按配方混合,混合均匀后在980℃条件下进行预烧。
2、再加入辅料,进行砂磨,D50控制在0.8~0.9微米。
3、将砂磨后的物料经过喷雾造粒,形成80目~200目的颗粒料。
4、将颗粒料压制成EP8.2产品,生坯密度控制在3.5g/cm3
5、将生坯采用氮气保护烧结,根据配方调整平衡氧分压,在1400℃保温烧结10小时,得到初产品。
6、将初产品用平面磨床研磨端面成镜面,并磨气隙,使用APX525,HP4284A仪器测试性能。
将实施例1-5所得产品做技术检测,结果如下:
(1)使用温度在-40℃~85℃范围内变化时,本发明MnZn铁氧体材料的THD变化情况
Figure BDA0001493103630000101
(2)使用频率在1KHz~500KHz范围内变化时,本发明MnZn铁氧体材料的THD变化情况
Figure BDA0001493103630000102
(3)叠加电流在0~50A范围内变化时,MnZn铁氧体材料的电感变化情况
Figure BDA0001493103630000103
由上可知,当使用温度在-40℃~85℃范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;当使用频率在1KHz~500KHz范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB。而且,本发明MnZn铁氧体材料具有高直流叠加性能,当叠加电流在0~50A范围内变化时,所述MnZn铁氧体材料的电感变化小于10%。
因此,本发明是集宽温低THD、宽频低THD及高直流叠加性能,三种优良特性于一身的新型多功能材料,可以满足特殊地理位置及环境使用,在偏冷、偏热、高频、低频、电流干扰等复杂环境下均能满足使用,而且在特殊地理环境下使用,也不需要安装空调、抗干扰等环境辅助设备。
以上所述是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也视为本发明的保护范围。

Claims (8)

1.一种MnZn铁氧体材料,其特征在于,包括主料和辅料,其中,
主料包括:Fe2O351~55mol%、MnO22~26mol%、ZnO18~20mol%、Co2O31~5mol%;
辅料包括:CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%;
所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(20%~80%):(20%~80%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(30%~70%):(30%~70%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(5%~95%):(5%~95%);
使用温度在-40℃~85℃范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;
使用频率在1KHz~500KHz范围内变化时,所述MnZn铁氧体材料的THD变化小于5dB;
叠加电流在0~50A范围内变化时,所述MnZn铁氧体材料的电感变化小于10%。
2.如权利要求1所述的MnZn铁氧体材料,其特征在于,辅料包括:CuO、Bi2O3组0.02~0.05wt%、CaO、V2O5组0.03~0.12wt%、TiO2、NiO组0.03~0.09wt%。
3.如权利要求2所述的MnZn铁氧体材料,其特征在于,所述CuO、Bi2O3组为CuO、Bi2O3混合制得的混合物,所述CuO、Bi2O3的混合比例为(30%~70%):(30%~70%);
所述CaO、V2O5组为CaO、V2O5混合制得的混合物,所述CaO、V2O5的混合比例为(40%~60%):(40%~60%);
所述TiO2、NiO组为TiO2、NiO混合制得的混合物,所述TiO2、NiO的混合比例为(15%~85%):(15%~85%)。
4.一种制备如权利要求1-3任一项所述的MnZn铁氧体材料的方法,其特征在于,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧;
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨。
5.如权利要求4所述的制备MnZn铁氧体材料的方法,其特征在于,砂磨过程中,物料的D50控制在0.8~0.9微米。
6.一种制备如权利要求1-3任一项所述的MnZn铁氧体的方法,其特征在于,包括:
1、将Fe2O350~56mol%、MnO21~28mol%、ZnO16~21mol%、Co2O30.1~5mol%混合,混合均匀后在900-1050℃条件下进行预烧;
2、再加入CuO、Bi2O3组0.01~0.07wt%、CaO、V2O5组0.02~0.15wt%、TiO2、NiO组0.02~0.12wt%进行砂磨;
3、将砂磨后的物料经过喷雾造粒,形成颗粒料;
4、将颗粒料压制成型,得到密度为2.0-4.0g/cm3的生坯;
5、将生坯采用氮气保护烧结,在1300-1500℃保温烧结4-10小时,得到初产品;
6、将初产品的端面磨成镜面,并磨气隙,得到产品。
7.如权利要求6所述的制备MnZn铁氧体的方法,其特征在于,砂磨过程中,物料的D50控制在0.8~0.9微米。
8.如权利要求6所述的制备MnZn铁氧体的方法,其特征在于,预烧温度为950-980℃;
所述颗粒料的颗粒度为80目~200目;
所述生坯的密度为2.8-3.2g/cm3
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