CN112239358A - 微波LiZnTiMn旋磁铁氧体材料及其制备方法 - Google Patents
微波LiZnTiMn旋磁铁氧体材料及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种高致密性微波LiZnTiMn旋磁铁氧体材料及其制备方法,属于冶金领域。本发明的LiZnTiMn旋磁铁氧体材料中还含有Bi2O3‑MXO,X为1或2,M为过渡金属。本发明的铁氧体材料性能更加优异,磁性好,同时致密性大大提高。采用本发明的方法的旋磁铁氧体材料的旋磁性能好,同时致密性大大提高,且不会带来不良影响。
Description
技术领域
本发明涉及一种高致密性微波LiZnTiMn旋磁铁氧体材料及其制备方法,属于冶金领域。
背景技术
随着电子信息技术的快速发展,微波器件已经被广泛应用于雷达系统、人工智能、卫星通信等先进技术中。各国家在微波器件领域的研究中投入了大量的财力物力,目前,其研究热点主要在以下三个方面:小型化移相器和开关;移动通讯基地台用环行器和隔离器;微波器件的小型化平面化。由于LiZnTiMn旋磁铁氧体具有低矫顽力,高的饱和磁感应强度,高剩余磁感应强度,这种材料在微波器件的制备与研发中得到了广泛的重视。传统高温烧结(~1200℃)方法制备的LiZnTiMn铁氧体材料,将其应用于微波移相器的制备中可制得性能优良的微波器件。然而,要实现微波移相器的小型化及批量化,就要求LiZnTiMn铁氧体能够与LTCF技术兼容,即在金属引线熔点温度以下(以银为例,小于960℃)实现LiZnTiMn旋磁铁氧体的烧结与制备。
然而在低温烧结过程中,存在各项磁性能、机械性能、热学性能等不能同时兼顾的问题,尤其是材料的致密度在LTCF技术中一直是一个难题。通常载流子迁移率随着致密度的增加而升高,由于样品中空洞的散射作用,致使电阻率ρ随着致密度的降低而升高,还会造成热导率κ的下降,塞贝克系数α等参数的恶化。当前研究铁氧体低温烧结的方法主要集中在两个方面,一是通过改进制备工艺,二是采用不同的掺杂方案来降低材料烧结温度。在保证低温烧结的同时,也要兼顾材料的致密性,只有材料的致密性高,才能使其气孔率,微观结构均匀性,旋磁性能获得一个良好的参数。
CN2016100988710一种实现低温烧结制备微波LiZnTiMn铁氧体材料的方法,通过在LiZnTiMn主粉体预烧之后加入氧化物Bi2O3添加剂实现LTCF工艺。通过Bi2O3在烧结反应时形成液相浸润铁氧体固相表面,对固相表面具有较好的润滑作用,减小晶粒表面的摩擦力,加速物质迁移,以此达到低温烧结的目的。但是Bi2O3作为非磁性物质,过多的引入会弱化LiZnTiMn铁氧体的磁性,也会导致晶粒吞并生长,微观结构的均匀性被破坏,不能保证材料在高水准的磁性能下进行低温烧结。
发明内容
本发明的第一个目的是提供一种新的高致密性微波LiZnTiMn旋磁铁氧体材料。
为达到本发明的第一个目的,所述LiZnTiMn旋磁铁氧体材料中还含有Bi2O3-MXO,X为1或2,M为过渡金属;
优选M为Ni,Co,Cu,X为1。
在一种具体实施方式中,所述LiZnTiMn旋磁铁氧体材料中Li0.35-0.42Zn0.27- 0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.4~99.8wt%,Bi2O3-MXO占0.6~0.2wt%;
优选所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.6wt%,Bi2O3-MXO占0.4wt%。
在一种具体实施方式中,所述Bi2O3-MXO中Bi2O3:MXO的重量比为:1~7:1~3。
本发明的第二个目的是提供上述高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法。
为达到本发明的第二个目的,所述方法包括:将Li0.35-0.42Zn0.27-0.3Ti0.1- 0.11Mn0.05-0.1Fe2.05-2.1O4和Bi2O3-MXO混合均匀,850~950℃烧结得到。
在一种具体实施方式中,所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4的制备方法包括:将配料加水进行球磨4~8小时,80~120℃烘干,按照2~4℃/min温度曲线升温至750~850℃,保温1~3小时得到LiZnTiMn主料;
所述配料为:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4;
优选球磨6小时100℃烘干,2℃/min温度曲线升温至800℃,保温2小时。
在一种具体实施方式中,所述配料中:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4的摩尔比为:1.025~1.05:0.27~0.3:0.1~0.11:0.175~0.21:0.0167:0.033。
在一种具体实施方式中,所述方法还包括:将Bi2O3与MXO混匀,得到添加剂;
将所述LiZnTiMn主料与添加剂按照:99.4~99.8wt%:0.2~0.6wt%混合,加水进行球磨4~8小时,烘干,按照2~4℃/min温度曲线升温至850~950℃保温2~4小时,冷却得到高致密性微波LiZnTiMn旋磁铁氧体材料;
优选球磨6小时,烘干,按照2℃/min温度曲线升温至900℃保温2小时。
在一种具体实施方式中,所述球磨的料、水、球重量比为1:1~1.5:3;优选所述球磨转速为200~250r/min,更优选为220r/min。
在一种具体实施方式中,所述方法还包括将LiZnTiMn主料与添加剂混合球磨、烘干后的物料加入胶水进行造粒成型,优选所述成型的压力为8~15Mpa,优选为8MPa。
在一种具体实施方式中,所述胶水优选为聚乙烯醇、聚乙二醇中至少一种。
有益效果:
本发明通过加入复合氧化物Bi2O3-MXO添加剂实现LTCF工艺,利用Bi2O3和MXO的协同作用实现低温烧结工艺。不仅利用了Bi2O3可以在烧结反应时形成液相浸润铁氧体固相表面,对固相表面具有较好的润滑作用,能减小晶粒表面的摩擦力,便于物质迁移的特点,也考虑到Bi2O3作为非磁性物质,过多的引入会弱化LiZnTiMn铁氧体的磁性,也会导致晶粒吞并生长,微观结构的均匀性被破坏。我们发现NiO可以在烧结反应时提供半径大的磁性离子进入晶粒内部,提高材料的旋磁性能,并且Bi2O3与MXO在低温时会反应生成烧结特性良好的低熔点共晶化合物,可以在低温烧结过程中更好的促进样品的晶粒生长及烧结致密,使得铁氧体材料获得更加优异的性能。
采用本发明的技术实现了较高水平旋磁参数的LiZnTiMn铁氧体在900℃的烧结和制备。
此外,相对于没有添加Bi2O3-MXO的LiZnTiMn铁氧体,所制备LiZnTiMn铁氧体的致密性大大提高,且不会带来不良影响。
附图说明
图1为实施例2中得到的采用LTCF法制备微波LiZnTiMn旋磁铁氧体材料与未加复合氧化物Bi2O3-NiO添加剂样品微结构对比图。
具体实施方式
为达到本发明的第一个目的,所述LiZnTiMn旋磁铁氧体材料中还含有Bi2O3-MXO,X为1或2,M为过渡金属;
优选M为Ni,Co,Cu,X为1。
在一种具体实施方式中,所述LiZnTiMn旋磁铁氧体材料中Li0.35-0.42Zn0.27- 0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.4~99.8wt%,Bi2O3-MXO占0.6~0.2wt%;
优选所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.6wt%,Bi2O3-MXO占0.4wt%。
在一种具体实施方式中,,所述Bi2O3-MXO中Bi2O3:MXO的重量比为:1~7:1~3。
本发明的第二个目的是提供上述高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法。
为达到本发明的第二个目的,所述方法包括:将Li0.35-0.42Zn0.27-0.3Ti0.1- 0.11Mn0.05-0.1Fe2.05-2.1O4和Bi2O3-MXO混合均匀,850~950℃烧结得到。
在一种具体实施方式中,所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4的制备方法包括:将配料加水进行球磨4~8小时,80~120℃烘干,按照2~4℃/min温度曲线升温至750~850℃,保温1~3小时得到LiZnTiMn主料;
所述配料为:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4;
优选球磨6小时100℃烘干,2℃/min温度曲线升温至800℃,保温2小时。
在一种具体实施方式中,所述配料中:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4的摩尔比为:1.025~1.05:0.27~0.3:0.1~0.11:0.175~0.21:0.0167:0.033。
在一种具体实施方式中,所述方法还包括:将Bi2O3与MXO混匀,得到添加剂;
将所述LiZnTiMn主料与添加剂按照:99.4~99.8wt%:0.2~0.6wt%混合,加水进行球磨4~8小时,烘干,按照2~4℃/min温度曲线升温至850~950℃保温2~4小时,冷却得到高致密性微波LiZnTiMn旋磁铁氧体材料;
优选球磨6小时,烘干,按照2℃/min温度曲线升温至900℃保温2小时。
在一种具体实施方式中,所述球磨的料、水、球重量比为1:1~1.5:3;优选所述球磨转速为200~250r/min,更优选为220r/min。
在一种具体实施方式中,所述方法还包括将LiZnTiMn主料与添加剂混合球磨、烘干后的物料加入胶水进行造粒成型,优选所述成型的压力为8~15Mpa,优选为8MPa。
在一种具体实施方式中,所述胶水优选为聚乙烯醇、聚乙二醇中至少一种。
下面结合实施例对本发明的具体实施方式做进一步的描述,并不因此将本发明限制在所述的实施例范围之中。
实施例1
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1.2:3的比例将步骤1配好的配料进行球磨,球磨时间为4小时,后取出80℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温1小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-NiO添加剂:以Bi2O3,NiO计,按照Bi2O3:NiO=1:1的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-NiO添加剂0.4wt%,步骤2的主料99.6wt%混合,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为4小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为8MPa,压制成坯件后,按照2℃/min温度曲线升温,在烧结温度点900℃保温2小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
实施例2
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1:3的比例将步骤1配好的配料进行球磨,球磨时间为6小时,后取出100℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温2小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-NiO添加剂:以Bi2O3,NiO计,按照Bi2O3:NiO=5:3的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-NiO添加剂0.4wt%,步骤2的主料99.6wt%混合,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为6小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为8MPa,压制成坯件后,按照2℃/min温度曲线升温,在烧结温度点900℃保温2小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
实施例3
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1.5:3的比例将步骤1配好的配料进行球磨,球磨时间为8小时,后取出120℃烘干,使粉料混合均匀后,按照4℃/min温度曲线升温至800℃,保温3小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-NiO添加剂:以Bi2O3,NiO计,按照Bi2O3:NiO=3:1的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-NiO添加剂0.6wt%,步骤2的主料99.4wt%混合,进行二次球磨,球磨比为料:水:球=1:1.5:3,球磨时间为8小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为8MPa,压制成坯件后,按照2℃/min温度曲线升温,在烧结温度点900℃保温2小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
实施例4
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1.2:3的比例将步骤1配好的配料进行球磨,球磨时间为6小时,后取出100℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温2小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-NiO添加剂:以Bi2O3,NiO计,按照Bi2O3:NiO=7:1的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-NiO添加剂0.2wt%,步骤2的主料99.8wt%混合,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为6小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为15MPa,压制成坯件后,按照4℃/min温度曲线升温,在烧结温度点900℃保温4小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
实施例5
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1.2:3的比例将步骤1配好的配料进行球磨,球磨时间为6小时,后取出100℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温2小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-CuO添加剂:以Bi2O3,CuO计,按照Bi2O3:CuO=2:1的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-CuO添加剂0.2wt%,步骤2的主料99.8wt%混合,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为6小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为15MPa,压制成坯件后,按照4℃/min温度曲线升温,在烧结温度点900℃保温4小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
对比例1
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1:3的比例将步骤1配好的配料进行球磨,球磨时间为6小时,后取出100℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温2小时得到LiZnTiMn主料。
(3)将步骤2制作得到的LiZnTiMn,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为6小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为8MPa,压制成坯件后,按照2℃/min温度曲线升温,在烧结温度点900℃保温2小时,自然冷却得到LTCF法制备的LiZnTiMn旋磁铁氧体材料。
对比例2
(1)称量配料:以Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4为原料,按照Li0.42Zn0.27Ti0.11Mn0.1Fe2.1O4的分子式来称量配料。
(2)一次球磨:按照料:水:铁球=1:1:3的比例将步骤1配好的配料进行球磨,球磨时间为6小时,后取出100℃烘干,使粉料混合均匀后,按照2℃/min温度曲线升温至800℃,保温2小时得到LiZnTiMn主料。
(3)制备复合氧化物Bi2O3-NiO添加剂:以Bi2O3,NiO计,按照Bi2O3:NiO=8:5的重量比来配料,混合均匀后作为添加剂备用;
(4)取步骤3制作得到的Bi2O3-NiO添加剂0.8wt%,步骤2的主料99.2wt%混合,进行二次球磨,球磨比为料:水:球=1:1:3,球磨时间为6小时,球磨转速为220r/min;将二次球磨出来的浆料烘干,加入聚乙烯醇(PVA)胶水进行造粒成型,成型压力为8MPa,压制成坯件后,按照2℃/min温度曲线升温,在烧结温度点900℃保温2小时,自然冷却得到LTCF法制备的微波LiZnTiMn旋磁铁氧体材料。
表1实施例及对比例得到的产品性能
图1为实施例2中得到的采用LTCF法制备微波LiZnTiMn旋磁铁氧体材料与对比例1未加复合氧化物Bi2O3-NiO添加剂样品微结构对比图。可以看到,通过加入重量比0.4wt%Bi2O3-NiO添加剂(Bi2O3与NiO的重量比为5:3)后LiZnTiMn晶粒明显长大,得到致密“烧熟”的微波LiZnTiMn旋磁铁氧体材料。
Claims (10)
1.高致密性微波LiZnTiMn旋磁铁氧体材料,其特征在于,所述LiZnTiMn旋磁铁氧体材料中还含有Bi2O3-MXO,X为1或2,M为过渡金属;
优选M为Ni,Co,Cu,X为1。
2.根据权利要求1所述的高致密性微波LiZnTiMn旋磁铁氧体材料,其特征在于,所述LiZnTiMn旋磁铁氧体材料中Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.4~99.8wt%,Bi2O3-MXO占0.6~0.2wt%;
优选所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4占99.6wt%,Bi2O3-MXO占0.4wt%。
3.根据权利要求1或2所述的高致密性微波LiZnTiMn旋磁铁氧体材料,其特征在于,所述Bi2O3-MXO中Bi2O3:MXO的重量比为:1~7:1~3。
4.权利要求1~3任一项所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述方法包括:将Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4和Bi2O3-MXO混合均匀,850~950℃烧结得到。
5.根据权利要求4所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述Li0.35-0.42Zn0.27-0.3Ti0.1-0.11Mn0.05-0.1Fe2.05-2.1O4的制备方法包括:将配料加水进行球磨4~8小时,80~120℃烘干,按照2~4℃/min温度曲线升温至750~850℃,保温1~3小时得到LiZnTiMn主料;
所述配料为:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4;
优选球磨6小时100℃烘干,2℃/min温度曲线升温至800℃,保温2小时。
6.根据权利要求5所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述配料中:Fe2O3,ZnO,TiO2,Li2CO3,Mn3O4的摩尔比为:1.025~1.05:0.27~0.3:0.1~0.11:0.175~0.21:0.0167:0.033。
7.根据权利要求4~6任一项所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述方法还包括:将Bi2O3与MXO混匀得到添加剂;
将所述LiZnTiMn主料与添加剂按照:99.4~99.8wt%:0.2~0.6wt%混合,加水进行球磨4~8小时,烘干,按照2~4℃/min温度曲线升温至850~950℃保温2~4小时,冷却得到高致密性微波LiZnTiMn旋磁铁氧体材料;
优选球磨6小时,烘干,按照2℃/min温度曲线升温至900℃保温2小时。
8.根据权利要求5或7中所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述球磨的料、水、球重量比为1:1~1.5:3;优选所述球磨转速为200~250r/min,更优选为220r/min。
9.根据权利要求7中所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述方法还包括将LiZnTiMn主料与添加剂混合球磨、烘干后的物料加入胶水进行造粒成型,优选所述成型的压力为8~15Mpa,优选为8MPa。
10.根据权利要求9中所述的高致密性微波LiZnTiMn旋磁铁氧体材料的制备方法,其特征在于,所述胶水优选为聚乙烯醇、聚乙二醇中至少一种。
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