CN114477988A - 一种易成型、高强度铁氧体材料及其制备方法 - Google Patents
一种易成型、高强度铁氧体材料及其制备方法 Download PDFInfo
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- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 42
- 239000000463 material Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title abstract description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000000465 moulding Methods 0.000 claims abstract description 27
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 17
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000008367 deionised water Substances 0.000 claims abstract description 16
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 11
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 11
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 11
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 11
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 10
- 230000035939 shock Effects 0.000 claims abstract description 10
- AMWRITDGCCNYAT-UHFFFAOYSA-L manganese oxide Inorganic materials [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 claims abstract description 8
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims abstract description 3
- 150000001924 cycloalkanes Chemical class 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 41
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
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- UPWOEMHINGJHOB-UHFFFAOYSA-N oxo(oxocobaltiooxy)cobalt Chemical compound O=[Co]O[Co]=O UPWOEMHINGJHOB-UHFFFAOYSA-N 0.000 description 6
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 5
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 description 5
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 4
- 229910003962 NiZn Inorganic materials 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
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- 229910010293 ceramic material Inorganic materials 0.000 description 2
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
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- 239000011573 trace mineral Substances 0.000 description 1
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Abstract
本发明公开了一种易成型、高强度铁氧体及其制备方法,属于软磁铁氧体材料领域。该铁氧体主成分为Fe2O3、Mn3O4、ZnO,副成分为Co2O3、CaCO3、Nb2O5、ZrO2、SiO2,相对主成分总量,附加成分含量为:去离子水:0.35~0.65wt%、C36H70O4Zn:0.16~0.28wt%、环烷烃CnH2n(n≥3的正整数):0.07~0.12wt%、芳烃CnH2n‑6(n≥6的正整数):0.03~0.08wt%。利用氧化物法工艺制备,在一定制备条件后具有易成型、较高的机械强度、较高的耐冷热冲击能力,其中微观结构晶粒细小、气孔分布合理,并且具有良好的电磁性能。
Description
技术领域
本发明属于软磁铁氧体材料领域,具体涉及一种易成型、高强度的铁氧体材料及其制备方法。
背景技术
随着电子零件小型化的发展、以及对车载电子设备抗冷热冲击能力的需求等对新产品的开发提出了更高的要求,目前主要有MnZn、NiZn两种软磁铁氧体产品,主要运用于网络通信、抗电磁干扰、无线充电、汽车电子等领域,是非常重要的电子功能材料。当前的铁氧体产品往往不耐冷热冲击、机械强度不高、易脆等严重影响着产品的可靠性。另一方面,冷热冲击损伤与材料的本征脆性是陶瓷材料在使用环境中的主要失效方式,而软磁铁氧体材料是功能陶瓷材料的一种,所以也适用于相同的冷热冲击理论和机械强度理论。
铁氧体粉料的成型过程是制备铁氧体产品最关键的一道工序,直接影响了铁氧体产品的机械强度和抗冷热冲击能力。同时为了提高产品的可靠性以及高强度的成型坯件,减少粉料的成型压力、促进粉料的易成型特性是最直接的方法。若粉料不易成型,则成型压力过大,会造成成型后开裂、粘模等严重问题,因此需要研发一些易成型、高强度铁氧体材料。
在国内已有一些相关易成型、高强度铁氧体材料及其制备方法的专利,具体如下:
(1) 公开号为CN102432279A,公开日为2013.08.07,发明名称为“一种高强度耐热冲击镍锌铁氧体及其制备方法”的中国专利公开了一种功率电感适用的高强度耐热冲击镍锌铁氧体及其制备方法。该镍锌铁氧体主成分以氧化物计算为:Fe2O3 45~52mol%、NiO 20~29mol%、ZnO 20~30mol%、CuO 3~6.5mol%,辅助成分为:CaCO3 0.2~0.5wt%,Co2O3 0.01~0.09wt%,V2O5 0.05~0.19wt%,SiO2 0.8~ 1.5wt%。采用氧化物法制备,在一定条件下烧结。烧结后制品的结晶晶粒尺寸为10~20μm,晶界鲜明,制品具有高强度和耐热冲击温度较高的特点,适应功率电感的小型化对材料的高强度和耐热冲击的双重要求。该发明主要考虑了镍锌铁氧体的高强度制备方法,而没有考虑到锰锌铁氧体,其配方设计与本发明完全不同。
(2) 公开号为CN111039669A,公开日为2020.04.21,发明名称为“高强度抗变形锰锌铁氧体及其制备方法”的中国专利公开了一种高强度抗变形锰锌铁氧体及其制备方法,包括主成分和辅助成分;所述主成分以各自氧化物计算,包括69~71mol%的Fe2O3,7~15mol%的ZnO,其余为MnO,总量为100%;所述辅助组分的总重量为所述主成分总重量的0.15~0 .5wt%,所述辅助成分包括CaCO3、TiO2、Nb2O5、Co2O3、B2O3、V2O5中的三种或三种以上。本发明通过特殊的掺杂工艺及烧结工艺曲线设计,使得所制备的锰锌铁氧体材料具有较高的磁导率特性,磁芯强度高,功耗低,且具有良好的温升特性,温度曲线平坦、高温功耗低,工作环境适应性强,可广泛应用于汽车电子领域,无线充电领域,通讯设备领域。该发明提高锰锌铁氧体强度主要以掺杂为主,没有在降低粉料成型压力、促进粉料易成型方面考虑问题,因此容易导致成型率低、生产成本增加、甚至电磁性能发生改变。
发明内容
本发明目的是针对上述技术问题,提供一种易成型、高强度的铁氧体材料制备方法。该材料具有易成型特性,所制备的成品具有高机械强度和抗冷热冲击的特性,以及具有优良的电磁性能。
为了实现上述目的,本发明采取以下技术方案:一种易成型、高强度的铁氧体材料及其制备方法,特征成分包括主成分、副成分以及附加成分,其主成分以各自标准物计的含量如下:
Fe2O3:63.2~77.5wt%、Mn3O4:20.6~25.2wt%、ZnO:6.4~7.9wt%;
作为一种优选范围,主成分以各自标准物计的含量为:Fe2O3:65.2~75.5wt%、Mn3O4:21.6~24.2wt%、ZnO:6.6~7.4wt%;
作为一种优选,主成分以各自标准物计的含量为:Fe2O3:69.95wt%、Mn3O4:22.87wt%、ZnO:7.18wt%。
相对主成分总量计算,副成分含量如下:
Co2O3:0.33~ 0.47wt%、CaCO3:0.041~ 0.063wt%、Nb2O5:0.017~0.031wt%、ZrO2:0.007~0.016wt%、SiO2:0.001~0.007wt%;
作为一种优选范围,相对主成分总量计算,副成分含量为:Co2O3:0.38~0.44wt%、CaCO3:0.048~0.057wt%、Nb2O5:0.023~0.028wt%、ZrO2:0.009~0.013wt%、SiO2:0.002~0.005wt%;
作为一种优选,相对主成分总量计算,副成分含量为:Co2O3:0.41wt%、CaCO3:0.052wt%、Nb2O5:0.026wt%、ZrO2:0.01wt%、SiO2:0.003wt%。
相对主成分总量计算,附加成分含量如下:
去离子水:0.35~0.65wt%、C36H70O4Zn:0.16~0.28wt%、环烷烃CnH2n(n≥3的正整数):0.07~0.12wt%、芳烃CnH2n-6(n≥6的正整数):0.03~0.08wt%;
作为一种优选范围,相对主成分总量计算,附加成分含量为:去离子水:0.4~0.61wt%、C36H70O4Zn:0.21~0.26wt%、CnH2n:0.09~0.11wt%、CnH2n-6:0.04~0.06wt%;
作为一种优选,相对主成分总量计算,附加成分含量为:去离子水:0.57wt%、C36H70O4Zn:0.23wt%、CnH2n:0.1wt%、CnH2n-6:0.05wt%。
上述的一种易成型、高强度铁氧体材料的制备方法,依次包括红砂混合、预烧、黑砂粉碎、造粒、増塑、成型以及烧结步骤,具体步骤如下:
(1)红砂混合:按主成分配比配料后进行湿法混合,用去离子水作为溶剂,混合时间为15~25分钟,然后将混合好的浆料在喷雾塔中进行喷雾烘干,进塔温度控制在330~370℃,出塔温度控制在110~130℃;
(2)预烧:将步骤(1)获得的粉料在回转窑中进行预烧,预烧气氛设为空气,预烧温度控制在820~860℃,升温时间为80~100分钟,保温100~130分钟;
(3)黑砂粉碎:将预烧得到的粉料中加入副成分后进行湿法粉碎,用去离子水作为溶剂,粉碎时间为90~110分钟,粉碎后料浆的中位粒径控制在1.05~1.25μm;
(4)喷雾造粒:在步骤(3)获得的粉料中加入PVA,PVA质量为黑砂粉碎后粉料质量的6.8~8.5%,在喷雾塔中进行喷雾造粒,然后干燥后得到颗粒粉料,进塔温度控制在330~370℃,出塔温度控制在80~100℃;
(5)增塑:在步骤(4)获得的粉料中加入附加成分,进行增塑处理,无需搅拌,静置5~7小时,增塑后粉料的松装比为1.35~1.45g/cm3;
(6)成型:将步骤(5)获得的粉料在成型压机中进行压制成型,坯件成型密度控制在2.88~2.93g/cm3;
(7)烧结:将步骤(6)获得的坯件在辊道窑中进行烧结,烧结气氛:先加氮气致密,然后在氧含量4.5~5.5%下保温,烧结温度控制在1147~1383℃,保温370~470分钟,烧结完成后随炉冷却至室温。
本发明通过对Fe2O3、Mn3O4、ZnO含量的调整来优化材料的磁导率、饱和磁感应强度和矫顽力。在副成分中通过对Co3O4含量的调整来调整材料的工作频率,同时减少损耗,加入CaCO3、Nb2O5增加晶界的厚度,同时降低烧结温度;加入微量元素ZrO2和SiO2,使烧结后晶粒细小,减少晶界与晶粒的气孔率,对提高材料机械强度与抗冷热冲击能力起到了一定的作用。在附加成分中通过调整去离子水和C36H70O4Zn的含量来增加粉料颗粒的润滑度,由于其具有良好的润滑性,因此提高了粉料的渗透性,有助于粉料成型;另一方面,由于CnH2n和CnH2n-6具有一定的溶解性,因此通过调整其含量,弥补了粉料颗粒的缺陷,提高了粉料颗粒的饱满度,使材料具有良好的流动性,同时由于粉料具有良好的渗透性,因此免去了粉料的搅拌,同时保护了粉料颗粒的完好性,降低了成型压力,减少了成型后坯件开裂、卡粉等问题,使得粉料更容易成型,也进一步提高了铁氧体磁环的机械强度和抗冷热冲击能力。与此同时,该粉料制成的产品具有良好的电磁特性并且符合绕线功率电感的测试要求。
与现有技术相比,本发明的有益效果是:
1.材料的铁氧体磁环在-40~125℃下、100次冷热冲击循环试验后的机械强度大于600N,成型率高且无开裂现象;
2. 在10KHz、25℃下的磁导率为3100±25%H/m,饱和磁感应强度大于510mT、矫顽力为10±5%A/m。
附图说明
图1为材料微观结构图:实施例1的铁氧体材料扫描电镜(SEM)照片。
具体实施方式
以下根据附图和实施例说明本发明。如没有特殊说明,下面所有百分数和比例关系,都为重量百分比。
实施例1
一种易成型、高强度的铁氧体材料,主成分为:Fe2O3:69.95%、Mn3O4:22.87%、ZnO:7.18%,副成分为:Co2O3:0.41%、CaCO3:0.052%、Nb2O5:0.026%、ZrO2:0.01%、SiO2:0.003%,附加成分为:去离子水:0.57%、C36H70O4Zn:0.23%、CnH2n:0.1%、CnH2n-6:0.05%。
一种用于制备易成型、高强度铁氧体材料的方法,依次包括红砂混合、预烧、黑砂粉碎、造粒以及増塑步骤,具体步骤如下:
(1)红砂混合:按主成分配比配料后进行湿法混合,用去离子水作为溶剂,混合时间为20分钟,然后将混合好的浆料在喷雾塔中进行喷雾烘干,进塔温度控制在350℃,出塔温度控制在120℃;
(2)预烧:将步骤(1)获得的粉料在回转窑中进行预烧,预烧气氛设为空气,预烧温度控制在840℃,升温时间为90分钟,保温120分钟;
(3)黑砂粉碎:将预烧得到的粉料中加入副成分后进行湿法粉碎,用去离子水作为溶剂,粉碎时间为100分钟,粉碎后料浆的中位粒径控制在1.05~1.25μm;
(4)喷雾造粒:在步骤(3)获得的粉料中加入PVA,PVA质量为黑砂粉碎后粉料质量的7.3%,在喷雾塔中进行喷雾造粒,然后干燥后得到颗粒粉料,进塔温度控制在350℃,出塔温度控制在90℃;
(5)增塑:在步骤(4)得到的粉料中加入附加成分,进行增塑处理,无需搅拌,静置6小时,增塑后粉料的松装比为1.35~1.45g/cm3;
(6)成型:将步骤(5)获得的粉料在成型压机中进行压制成型,坯件成型密度控制在2.88~2.93g/cm3;
(7)烧结:将步骤(6)获得的坯件在辊道窑中进行烧结,烧结气氛:先加氮气致密,然后在氧含量5%下保温,烧结温度控制在1275℃,保温420分钟,烧结完成后随炉冷却至室温。
经过以上工序制得铁氧体磁环样品(T50mm×25mm×20mm),然后进行磨削分拣加工处理。
将以上步骤处理后的铁氧体磁环进行机械强度测试、-40~125℃100次冷热冲击循环试验,并在匝数N=10Ts、测试频率f=10KHz、测试电压U=0.3V、测试温度T=25℃以及磁场强度H=1194A/m的条件下,测试磁环的起始磁导率μi、饱和磁感应强度Bs、矫顽力Hc。
实施例2
本实施例与实施例1相比副成分不同,其不同之处在于:ZrO2:0.013%、SiO2:0.005%,其他均与实施例1相同。
实施例3
本实施例与实施例1相比附加成分不同,其不同之处在于:去离子水:0.5%、C36H70O4Zn:0.15%,其他均与实施例1相同。
对比例1
本对比例与实施例1相比副成分和附加成分不同,其副成分不同之处在于:不含有ZrO2;其附加成分不同之处在于:不含有CnH2n和CnH2n-6。
对比例2
本对比例与实施例1相比附加成分不同,其不同之处在于:不含有CnH2n和CnH2n-6。
对比例3
本对比例与实施例1相比附加成分不同,其不同之处在于:C36H70O4Zn:0.11%,不含有CnH2n和CnH2n-6。
表1列出来实施例和对比例的电磁性能以及评价结果,其中,没有达到指标要求的加上“*”,“OK”指达到指标要求,“NG”指未达到指标要求,其中,对于成型率而言,达到指标是指成型率达到100%。根据表格可以清晰的发现实施例和对比例的不同,根据对比发现,本发明能够保证标准的磁导率、具有较高的饱和磁感应强度以及标准的矫顽力要求,同时成型率高,并且提高了抗冷热冲击能力和烧结后的机械强度。本发明通过增加CnH2n和CnH2n-6的含量,可以提高材料的流动性与颗粒的完好度,能够有效的降低成型压力,实现易成型。从图1中可以看出,铁氧体磁环经过实施例1烧结后晶粒尺寸普遍在21μm以下,气孔细小且含量少,是由于部分Zr离子填补了铁氧体晶格结构的缺失,减少了氧空位含量,进而使气孔含量减少,因此晶粒尺寸小、气孔分布合理是提高材料强度的重要因素。
表1实施例和对比例的各项性能
综上所述,本发明可以提供一种易成型、高强度铁氧体材料的制备方法,可以实现特定的成型压制密度,并且易成型、成型率高,烧结后具有抗冷热冲击能力与较高的机械强度,并且能够满足电磁性能的测试要求。
本发明所描述的具体实施例仅仅是对本发明作举例说明,相关技术领域的专家或技术人员可以对所描述的具体实施例做不同程度的修改,补充或者用类似的方式替代,但并不会偏离本发明的精神或者超越所附权利要求书所定义的范围。
Claims (9)
1.一种易成型、高强度铁氧体材料,包括主成分和副成分,主成分以各自标准物计含量为:Fe2O3:63.2~ 77.5wt%、Mn3O4:20.6~ 25.2wt%、ZnO:6.4~ 7.9wt%;相对主成分总量计算,副成分含量为:Co2O3:0.33~ 0.47wt%、CaCO3:0.041~ 0.063wt%、Nb2O5:0.017~0.031wt%、ZrO2:0.007~0.016wt%、SiO2:0.001~0.007wt%;相对主成分总量计算,附加成分含量为:去离子水:0.35~ 0.65wt%、C36H70O4Zn:0.16~0.28wt%、环烷烃CnH2n:0.07~0.12wt%,其中,n≥3的正整数、芳烃CnH2n-6:0.03~0.08wt%,其中,n≥6的正整数。
2.根据权利要求1所述的易成型、高强度铁氧体材料,其特征在于,所述主成分以各自标准物计含量为:Fe2O3:65.2~75.5wt%、Mn3O4:21.6~24.2wt%、ZnO:6.6~7.4wt%;相对主成分总量计算,所述副成分含量为:Co2O3:0.38~ 0.44wt%、CaCO3:0.048~ 0.057wt%、Nb2O5:0.023~ 0.028wt%、ZrO2:0.009~ 0.013wt%、SiO2:0.002~0.005wt%;相对主成分总量计算,所述附加成分含量为:去离子水:0.4~0.61wt%、C36H70O4Zn:0.21~0.26wt%、CnH2n:0.09~0.11wt%、CnH2n-6:0.04~0.06wt%。
3.根据权利要求2所述的易成型、高强度铁氧体材料,其特征在于,所述副成分和附加成分相对主成分总量计算,含量分别为ZrO2:0.01wt%、SiO2:0.003wt%、去离子水:0.57wt%、C36H70O4Zn:0.23wt%、CnH2n:0.1wt%、CnH2n-6:0.05wt%。
4.根据权利要求1所述的低成型压力、高强度铁氧体材料,其特征在于,所述材料的铁氧体磁环在-40~125℃下、100次冷热冲击循环试验后的机械强度大于600N,且无开裂现象,在10KHz、25℃下的磁导率为3100±25%H/m,饱和磁感应强度大于510mT、矫顽力为10±5%A/m。
5.一种权利要求1所述的易成型、高强度铁氧体材料的制备方法,包括红砂混合、预烧、黑砂粉碎、造粒、増塑、成型以及烧结,具体步骤如下:
(1)红砂混合:按主成分配比配料后进行湿法混合,用去离子水作为溶剂,然后将混合好的浆料进行喷雾烘干;
(2)预烧:将步骤(1)获得的粉料在进行预烧,预烧气氛设为空气;
(3)黑砂粉碎:将预烧得到的粉料中加入副成分后进行湿法粉碎,用去离子水作为溶剂,粉碎时间为90~110分钟,粉碎后料浆的中位粒径控制在1.05~1.25μm;
(4)喷雾造粒:在步骤(3)获得的粉料中加入PVA,进行喷雾造粒,然后干燥后得到颗粒粉料;
(5)增塑:在步骤(4)获得的粉料中加入附加成分,进行增塑处理,无需搅拌,静置5~7小时,增塑后粉料的松装比为1.35~1.45g/cm3;
(6)成型:将步骤(5)获得的粉料进行压制成型,坯件成型密度控制在2.88~2.93g/cm3;
(7)烧结:将步骤(6)获得的坯件进行烧结,烧结温度控制在1147℃~1383℃,烧结完成后随炉冷却至室温。
6.如权利要求5所述的易成型、高强度铁氧体材料的制备方法,特征在于,所述步骤(1)中,混合时间为15~25分钟,混合好的浆料在喷雾塔中进行喷雾烘干,进塔温度控制在330~370℃,出塔温度控制在110~130℃。
7.如权利要求5所述的易成型、高强度铁氧体材料的制备方法,特征在于,所述步骤(2)中,预烧温度控制在820~860℃,升温时间为80~100分钟,保温100~130分钟。
8.如权利要求5所述的易成型、高强度铁氧体材料的制备方法,特征在于,所述步骤(4)中,加入的PVA质量为黑砂粉碎后粉料质量的6.8~8.5%,在喷雾塔中进行喷雾造粒,进塔温度控制在330~370℃,出塔温度控制在80~100℃。
9.如权利要求5所述的易成型、高强度铁氧体材料的制备方法,特征在于,所述步骤(6)中,烧结气氛:先加氮气致密,然后在氧含量4.5~5.5%下保温,烧结温度控制在1147℃~1383℃,保温370~470分钟。
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