CN113105226B - 一种微波陶瓷介质材料及其制备方法 - Google Patents
一种微波陶瓷介质材料及其制备方法 Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 56
- 239000003989 dielectric material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 229910004283 SiO 4 Inorganic materials 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 41
- 239000013078 crystal Substances 0.000 claims abstract description 31
- 238000000498 ball milling Methods 0.000 claims description 68
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 56
- 239000011777 magnesium Substances 0.000 claims description 44
- 239000002245 particle Substances 0.000 claims description 38
- 238000002156 mixing Methods 0.000 claims description 32
- 239000011787 zinc oxide Substances 0.000 claims description 28
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000005245 sintering Methods 0.000 claims description 20
- 239000000395 magnesium oxide Substances 0.000 claims description 16
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 15
- 229910021193 La 2 O 3 Inorganic materials 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 14
- 230000000996 additive effect Effects 0.000 claims description 14
- 230000003179 granulation Effects 0.000 claims description 14
- 238000005469 granulation Methods 0.000 claims description 14
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 14
- 239000011812 mixed powder Substances 0.000 claims description 14
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- 239000000377 silicon dioxide Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 238000007873 sieving Methods 0.000 claims description 12
- 230000002194 synthesizing effect Effects 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000012153 distilled water Substances 0.000 claims description 7
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Inorganic materials O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 claims description 7
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 claims description 7
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 239000004408 titanium dioxide Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 238000003786 synthesis reaction Methods 0.000 abstract description 5
- 229910017625 MgSiO Inorganic materials 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 238000010348 incorporation Methods 0.000 description 7
- 238000004891 communication Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
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Abstract
本发明公开一种微波陶瓷介质材料及其制备方法,所述微波陶瓷介质材料的主晶相结构为xMg2SiO4‑(1‑x)[yZrTi2O6‑(1‑y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;其Qf值为68000~78000GHz,相对介电常数εr为10.6~16.6,谐振频率温度系数在±7ppm/℃以内。本发明不仅有效地降低了Mg2SiO4晶相合成温度,还抑制了MgSiO3第二相的形成,同时制得的材料性能优良、制备工艺易控、成本低廉等优点,因此具有广阔的市场前景。
Description
技术领域
本发明属于无机非金属材料领域,具体是一种微波陶瓷介质材料及其制备方法。
背景技术
微波介质陶瓷是指应用于微波频段(300MHz-300GHz频段)电路中作为介质材料并完成一种或多种功能的陶瓷,在现代通信中被广泛用作谐振器、滤波器、介质基片、介质天线、介质导波回路等。微波介质谐振器与金属空腔谐振器相比,具有体积小、质量轻、温度稳定性好、价格便宜等优点。
随着微波通信的快速发展,微波通信系统迫切需要高性能的微波介质器件。目前移动通信的频率范围在800~5500MHz,相应的微波介质器件趋于成熟,但当频率向高端发展时,如华为在2021年4月提出的5~5.5G无线通信,面向2025共同启动5.5G创新和标准化;又如卫星通信的频率位于K波段(12~40GHz),已开发的微波介质材料的εr较大(εr≥20)、Q·f值较小,无法制造出低损耗、合适尺寸的微波介质器件,因此有必要开发低介电常数、低频率温度系数、高Q·f值的微波介质材料。
镁橄榄石(Mg2SiO4)具有低的介电常数、较高的Q·f值,比A12O3陶瓷烧结温度低,适合作为低介电常数介质谐振器或基板的一种微波介质材料。Mg2SiO4陶瓷作为介质谐振器材料存在着以下缺陷。其一,Mg2SiO4陶瓷具有较大的负谐振频率温度系数(-67ppm/℃);其二,Mg2SiO4晶相合成温度高(1260℃),Mg2SiO4陶瓷在合成和烧结过程中容易出现MgSiO3第二相,这个第二相有较高的介电损耗,它的出现降低了Mg2SiO4陶瓷的微波介电性能。在对Mg2SiO4陶瓷研究工作中人们发现,SiO2过量10%至20%的情况下,在1160~1240℃烧结均获得较纯的Mg2SiO4相,但过量SiO2同样增大了材料的微波损耗。0vchar在2007年报道了MgO和SiO2按摩尔比为2:1合成Mg2SiO4过程中,1200℃以下会产生MgSiO3和MgO,在1300℃以上烧结可以获得纯的Mg2SiO4相。国内专利CN102659396A采用Mg2SiO4-BaTiO3添加烧结助剂和掺杂剂,在1320~1380℃烧结,制备了εr从3~8之间可调、Q·f值大于60000、温度系数控制在±20ppm/℃的微波介质材料。国内专利CN103319166A采用MgTiO3-Mg2SiO4-CaTiO3添加掺杂剂,制备了εr从10~22之间,温度系数控制在±10ppm/℃,在1320~1350℃烧结的微波介质材料。
目前,报道能够做到介电常数εr从9-17之间可调,温度系数控制在±7ppm/℃内,同时Q·f在68000-78000GHz之间的材料体系非常少,当前迫切需要开发一种工艺简单、原材料成本低同时满足低损耗特征、介电常数系列可调的微波介质陶瓷,以满足微波通信行业的应用需求。
发明内容
本发明的目的在于克服现有技术的不足,提供一种性能优良、工艺易控、成本低廉的微波陶瓷介质材料及其制备方法。
本发明通过以下技术方案予以实现:一种微波陶瓷介质材料,其特征在于:所述微波陶瓷介质材料的主晶相结构为xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;其Qf值为68000~78000GHz,相对介电常数εr为10.6~16.6,谐振频率温度系数在±7ppm/℃以内。
上述微波陶瓷介质材料的制备方法,其特征在于包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1120~1200℃下保温3~4小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、0.5~1.3%掺入La2O3、0.5~1.3%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1020~1080℃温度下保温2~4小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的15~18%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在10~15MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1260~1320℃温度和还原气氛下保温3~4小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:2~5重量比,球磨4~6小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
本发明制备的微波陶瓷介质材料,其主晶相结构为xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;其Qf值为68000~78000GHz,相对介电常数εr为10.6~16.6,谐振频率温度系数在±7ppm/℃以内。本发明不仅有效地降低了Mg2SiO4晶相合成温度,还抑制了MgSiO3第二相的形成,同时制得的材料性能优良、制备工艺易控、成本低廉等优点,因此具有广阔的市场前景。
附图说明
图1 为实施例1中合成Mg2SiO4的XRD检测图。
具体实施方式
实施例1
一种微波陶瓷介质材料的制备方法,包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1120℃下保温3小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中x=0.5,y=0.79;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、0.5%掺入La2O3、1.3%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1020℃温度下保温2小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的15%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在10MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1260℃温度和还原气氛下保温3小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:2重量比,球磨4小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
材料的Qf值为68000GHz,相对介电常数εr为10.6,-40~25℃范围内谐振频率温度系数为+1.0ppm/℃,25~85℃范围内谐振频率温度系数为-1.0ppm/℃。
实施例2
一种微波陶瓷介质材料的制备方法,包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1140℃下保温4小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中x=0.55,y=0.79;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、0.8%掺入La2O3、0.8%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1040℃温度下保温3小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的16%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在11MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1270℃温度和还原气氛下保温4小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:3重量比,球磨5小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
材料的Qf值为70000GHz,相对介电常数εr为11,-40~25℃范围内谐振频率温度系数为+3.2ppm/℃,25~85℃范围内谐振频率温度系数为-3.5ppm/℃。
实施例3
一种微波陶瓷介质材料的制备方法,包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1160℃下保温3小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中x=0.6,y=0.8;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、1.0%掺入La2O3、0.7%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1060℃温度下保温4小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的17%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在12MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1280℃温度和还原气氛下保温3小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:4重量比,球磨6小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
材料的Qf值为72000GHz,相对介电常数εr为12.5,-40~25℃范围内谐振频率温度系数为+5.2ppm/℃,25~85℃范围内谐振频率温度系数为-5.8ppm/℃。
实施例4
一种微波陶瓷介质材料的制备方法,包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1180℃下保温4小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中x=0.65,y=0.8;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、1.2%掺入La2O3、0.6%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1080℃温度下保温2小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的18%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在13MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1300℃温度和还原气氛下保温4小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:5重量比,球磨6小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
材料的Qf值为74000GHz,相对介电常数εr为14.6,-40~25℃范围内谐振频率温度系数为+6.2ppm/℃,25~85℃范围内谐振频率温度系数为-6.0ppm/℃。
实施例5
一种微波陶瓷介质材料的制备方法,包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2um、99%的氧化镁,1.5um、99.5%的二氧化硅,1.8um、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1200℃下保温4小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5um、99.9%的氧化锆,2.0um、99.5%二氧化钛,1.8um、99%的氧化锌,1.5um、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中x=0.7,y=0.82;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、0.8%掺入La2O3、0.5%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1070℃温度下保温4小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的17%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在15MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1320℃温度和还原气氛下保温4小时,得到最终的微波陶瓷介质材料。
所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4: 5重量比,球磨6小时。
所述步骤2中添加剂MnO2的粒径D50为1.2um、La2O3的粒径D50为0.9um、BaCO3的粒径D50为1.1um。
材料的Qf值为76000GHz,相对介电常数εr为15.9,-40~25℃范围内谐振频率温度系数为+6.8ppm/℃,25~85℃范围内谐振频率温度系数为-6.9ppm/℃。
上述谐振频率温度系数τƒ是根据Hakki-Coleman介质谐振法, 用网络分析仪(Aglient technologies E5071C)由(ft1-f0)/f0(t1-t0)计算所得,其中(25-85℃)t0=25℃、t1=85℃;(-40-25℃)t0=25℃、t1=-40℃覆盖全温度范围。
Claims (4)
1.一种微波陶瓷介质材料,其特征在于:所述微波陶瓷介质材料的主晶相结构为xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;其Qf值为68000~78000GHz,相对介电常数εr为10.6~16.6,谐振频率温度系数在±7ppm/℃以内。
2.根据权利要求1所述微波陶瓷介质材料的制备方法,其特征在于包括以下步骤:
步骤1:Mg2SiO4主晶相粉料合成:
以粒径D50和纯度分别为2μm 、99%的氧化镁,1.5μm 、99.5%的二氧化硅,1.8μm 、99.5%的氧化锌为起始原料,按摩尔比Mg:Si=2:l进行氧化镁和二氧化硅的配料,按微波陶瓷介质材料总质量的1%添加ZnO;原料经球磨混合均匀后在1120~1200℃下保温3~4小时,随炉冷却得到含有ZnO的Mg2SiO4 主晶相粉料;
步骤 2: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6]预烧料混合:
将步骤1所得的Mg2SiO4主晶相粉料,与粒径D50和纯度分别为1.5μm 、99.9%的氧化锆,2.0μm 、99.5%二氧化钛,1.8μm 、99%的氧化锌,1.5μm 、99.9%的五氧化二铌混合,混合时控制配比: xMg2SiO4-(1-x)[yZrTi2O6-(1-y)ZnNb2O6],其中0.5≤x≤0.7,0.78≤y≤0.82;按微波陶瓷介质材料总质量比的0.2%掺入MnO2、0.5~1.3%掺入La2O3、0.5~1.3%掺入BaCO3为添加剂,然后将混合粉料进行第二次球磨,球磨浆料在100℃下烘干并过40目筛,最后混合粉料在1020~1080℃温度下保温2~4小时,得到预烧料,并进行第三次球磨,球磨浆料在100℃下烘干并过40目筛;
步骤3:造粒、成型:
按微波陶瓷介质材料总质量的15~18%向步骤2所得预烧料中添加质量浓度为8%的聚乙烯醇水溶液造粒,造粒尺寸控制在60~250目,并在10~15MPa下压制成生坯;
步骤4 :烧结:
将步骤3所得生坯,在1260~1320℃温度和还原气氛下保温3~4小时,得到最终的微波陶瓷介质材料。
3.根据权利要求2所述的制备方法,其特征在于:所述步骤1和步骤2中球磨工序的工艺为:以二氧化锆球为球磨介质、蒸馏水/去离子水作为溶剂,按照料:球:水=1:4:2~5重量比,球磨4~6小时。
4.根据权利要求2所述的制备方法,其特征在于:所述步骤2中添加剂MnO2的粒径D50为1.2μm 、La2O3的粒径D50为0.9μm 、BaCO3的粒径D50为1.1μm 。
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