CN116462496B - 一种介电陶瓷的制备方法和产品 - Google Patents
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- 238000007599 discharging Methods 0.000 claims abstract description 17
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 15
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- 229910052712 strontium Inorganic materials 0.000 description 2
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Abstract
本发明属于介电陶瓷技术领域,具体涉及一种介电陶瓷的制备方法和产品。所述制备方法包括以下步骤:(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;(2)按照结构式为Sr1‑x‑y‑zZnxMnyBazAl2Si2O8;其中x=0.001~0.005;y=0.002~0.006;z=0.01~0.05,称量原料,采用湿法球磨,进行球磨;(3)球磨后的粉体烘干,预煅烧;(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在50~90MPa下压制成胚体,然后将胚体于400~500℃下排胶3~5h,然后在1300~1400℃下烧结3~6h,然后自然冷却至室温得到介电陶瓷。所述介电陶瓷的介电常数εr为7.45~8.19,品质因数Q×f为4.91×104~5.01×104GHz,温度系数为τf为‑27.2~‑27.9ppm/℃。
Description
技术领域
本发明属于介电陶瓷技术领域。更具体地,涉及一种介电陶瓷的制备方法和产品。
背景技术
微波介质陶瓷就是应用于微波频段电路中作为介质材料并完成一种或多种功能的陶瓷。目前,低介电常数介质陶瓷运用在雷达、移动通讯、微波基片及电子封装等重要领域。
锶长石(SrAl2Si2O8,SAS)是一种介电常数小(εr≈7)、品质因数较低(Q×f≈15000GHz)、谐振频率温度系数为负(τf=-30.32×10-6/℃)的微波介质陶瓷。主要晶型有3种形式:六方相、单斜相和正交相。六方相为高温亚稳相,具有高热膨胀系数(~8×10-6/℃),在578℃下与正交相发生可逆相变,这一过程会伴随约为3%的体积膨胀,可能造成基体开裂。而单斜锶长石相抗氧化能力强,熔点高(~1650℃)和热膨胀系数低(~2.5×10-6/℃),在低于1500℃时能够稳定存在,不发生相转变。
CN102365249B公开了一种具有高介电常数和经抑制的低热膨胀系数的介电陶瓷组合物。还公开了一种使用该介电陶瓷组合物的多层介电基板,和电子部件。具体地公开了一种含有ATiO3(其中A代表Ca和/或Sr中任一种)相和AAl2Si2O8相,所述的介电陶瓷组合物的特征在于:介电常数在3GHz下不小于10以及在40-600℃温度内的平均热膨胀系数小于7ppm/℃。
综上所述,现有技术中对SrAl2Si2O8介电陶瓷改性进而改善介电常数以及品质因数,但是并不能保证温度系数,或者其他温度系数能够保证,但是介电常数和品质因数较差。
发明内容
本发明要解决的技术问题是克服现有技术中存在的缺陷和不足,提供一种介电陶瓷的制备方法和产品。所述制备方法包括以下步骤:(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;(2)按照结构式为Sr1-x-y-zZnxMnyBazAl2Si2O8;其中x=0.001~0.005;y=0.002~0.006;z=0.01~0.05,称量原料,采用湿法球磨,进行球磨;(3)球磨后的粉体烘干,预煅烧;(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在50~90MPa下压制成胚体,然后将胚体于400~500℃下排胶3~5h,然后在1300~1400℃下烧结3~6h,然后自然冷却至室温得到介电陶瓷。所述介电陶瓷的介电常数εr为7.45~8.19,品质因数Q×f为4.91×104~5.01×104GHz,温度系数为τf为-27.2~-27.9ppm/℃。
本发明的目的是提供一种介电陶瓷的制备方法。
本发明另一目的是提供一种介电陶瓷。
本发明上述目的通过以下技术方案实现:
一种介电陶瓷的制备方法,所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;
(2)按照结构式为Sr1-x-y-zZnxMnyBazAl2Si2O8;其中x=0.001~0.005;y=0.002~0.006;z=0.01~0.05,称量原料,采用湿法球磨,进行球磨;
(3)球磨后的粉体烘干,预煅烧;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在50~90MPa下压制成胚体,然后将胚体于400~500℃下排胶3~5h,然后在1300~1400℃下烧结3~6h,然后自然冷却至室温得到介电陶瓷。
优选的,在步骤(4)中,所述预烧后的粉体和烧结助剂的质量比为:1:0.005~0.015。
优选的,在步骤(4)中,所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.2~0.8:0.4~1。
优选的,在步骤(2)中,所述球磨介质为无水乙醇,所述球磨时间为10~20h,转速为350~450r/min。
优选的,在步骤(1)中,配料前将原料在100~140℃烘干10~20h。
优选的,在步骤(3)中,所述预煅烧的条件是在800~900℃预煅烧2~4h,升温速率为2~4℃/min。
优选的,在步骤(3)中,所述烘干的温度为100~140℃,干燥时间为8~12h。
优选的,在步骤(4)中,所述球磨时间为6~10h,转速为350~450r/min。
优选的,在步骤(5)中,所述将胚体于400~500℃下排胶3~5h,然后在1300~1400℃下烧结3~6h,具体为从室温以1~3℃/min升温至400~500℃,排胶3~5h,然后以5~7℃/min升温至1300~1400℃烧结3~6h。
基于上述所述的一种介电陶瓷的制备方法制备的介电陶瓷,所述介电陶瓷的介电常数εr为7.45~8.19,品质因数Q×f为4.91×104~5.01×104GHz,温度系数为τf为-27.2~-27.9ppm/℃。
本发明具有以下有益效果:
(1)本发明通过添加改性组分以及优化烧结助剂,显著改善了介电陶瓷的的介电常数、品质因数和温度系数等,而且发现本申请的添加的改善组分和烧结助剂之间具有相互作用,正是由于组分的相互作用改善了介电陶瓷的综合性能。
(2)本发明制备工艺简单,成本低,有利于工业化生产。
具体实施方式
以下结合具体实施例来进一步说明本发明,但实施例并不对本发明做任何形式的限定。除非特别说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。
除非特别说明,以下实施例所用试剂和材料均为市购。
实施例1
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
实施例2
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在140℃烘干10h;
(2)按照结构式为Sr0.943Zn0.005Mn0.002Ba0.05Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为10h,转速为450r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为140℃,干燥时间为8h,所述预煅烧的条件是在900℃预煅烧2h,升温速率为4℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为6h,转速为450r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.015;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.8:0.4;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在90MPa下压制成胚体,然后将胚体从室温以3℃/min升温至500℃下排胶3h,然后以7℃/min升温至1400℃下烧结3h,然后自然冷却至室温得到介电陶瓷。
实施例3
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在100℃烘干20h;
(2)按照结构式为Sr0.983Zn0.001Mn0.006Ba0.01Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为20h,转速为350r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为100℃,干燥时间为12h,所述预煅烧的条件是在800℃预煅烧4h,升温速率为2℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为10h,转速为350r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.005;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.2:1;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在50MPa下压制成胚体,然后将胚体从室温以1℃/min升温至400℃下排胶5h,然后以5℃/min升温至1300℃下烧结6h,然后自然冷却至室温得到介电陶瓷。
对比例1
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.007Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例2
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Mn0.007Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例3
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.034Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例4
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Ba0.034Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例5
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO和Al2O3,其中CuO和Al2O3的质量比为:1.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例6
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为ZnO和Al2O3,其中ZnO和Al2O3的质量比为:1.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例7
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO和ZnO,其中CuO和ZnO的质量比为:1.6:0.4;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
对比例8
一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min。所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为ZnO和Al2O3,其中ZnO和Al2O3的质量比为:0.4:1.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
将上述实施例1-3和对比例1-8所获得的微波介质陶瓷进行研磨抛光,得到表面平整光滑的陶瓷成品,采用Agilent N5230A型矢量网络分析仪测试陶瓷介电常数和品质因数,测试频率在11.5GHz左右:采用Espec MC-710P型小型高低温试验箱分别测试陶瓷样品在25℃和85℃条件下的中心谐振频率,再利用公式计算陶瓷试样的谐振频率温度系数:τf=(f85-f25)/(60×f25)。
表1
εr | Q×f(×104GHz) | τf(ppm/℃) | |
实施例1 | 8.19 | 5.01 | -27.2 |
实施例2 | 7.45 | 4.91 | -27.9 |
实施例3 | 7.93 | 4.98 | -27.5 |
对比例1 | 7.25 | 4.71 | -29.9 |
对比例2 | 7.35 | 4.83 | -28.9 |
对比例3 | 7.29 | 4.73 | -29.6 |
对比例4 | 7.31 | 4.75 | -29.4 |
对比例5 | 7.32 | 4.76 | -29.3 |
对比例6 | 7.36 | 4.85 | -28.6 |
对比例7 | 7.34 | 4.81 | -29.1 |
对比例8 | 7.38 | 4.87 | -28.3 |
由表1可以看出,本发明的一种介电陶瓷,利用了改性组分以及烧结助剂之间的相互配合,使得介电陶瓷的的介电常数εr为8.19,最优的品质因数Q×f为5.01×104GHz,而且温度系数τf达到-27.2ppm/℃。因而本申请制备的介电陶瓷具有优异的微波性能,具有良好的应用前景。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (2)
1.一种介电陶瓷的制备方法,其特征在于:所述制备方法包括以下步骤:
(1)以纯度均为99.9%的SrCO3、ZnO、MnO、BaCO3、Al2O3和SiO2粉末为原料;配料前将原料在120℃烘干15h;
(2)按照结构式为Sr0.963Zn0.003Mn0.004Ba0.03Al2Si2O8称量原料,采用湿法球磨,球磨介质为无水乙醇,进行球磨;所述球磨时间为15h,转速为400r/min;
(3)球磨后的粉体烘干,预煅烧;所述烘干的温度为120℃,干燥时间为10h,所述预煅烧的条件是在850℃预煅烧3h,升温速率为3℃/min;
(4)将预烧后的粉体和烧结助剂放入到玛瑙研钵中,进行二次球磨;所述球磨时间为8h,转速为400r/min,所述预烧后的粉体和烧结助剂的质量比为:1:0.01;所述烧结助剂为CuO、ZnO和Al2O3,其中CuO、ZnO和Al2O3的质量比为:1:0.4:0.6;
(5)二次球磨后的粉体烘干,加入到陶瓷研钵中,加入5wt%的PVA溶液,混合均匀后,进行造粒,在70MPa下压制成胚体,然后将胚体从室温以2℃/min升温至450℃下排胶4h,然后以6℃/min升温至1350℃下烧结5h,然后自然冷却至室温得到介电陶瓷。
2.根据权利要求1所述的制备方法制备得到的介电陶瓷,其特征在于:所述介电陶瓷的介电常数εr为8.19,品质因数Q×f为5.01×104GHz,温度系数τf为-27.2ppm/℃。
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