CN111574198A - 高储能锆酸铅基反铁电多层陶瓷电容器及其制备方法 - Google Patents
高储能锆酸铅基反铁电多层陶瓷电容器及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种高储能锆酸铅基反铁电多层陶瓷电容器及其制备方法,本发明的锆酸铅基反铁电厚膜陶瓷材料的化学通式为(Pb0.98‑ xLa0.02Cax)(Zr0.7Sn0.3)0.995O3,其中,x的取值范围为:4%≦x≦6%。本发明制备得到的锆酸铅基反铁多层陶瓷电容器具有高储能密度和储能效率的特点,有利于高功率大容量存储电容器件的开发和应用,且本发明的制备方法具有工艺简单以及能够实现制备致密流延厚膜等优点,利于本发明制备得到的电容器能够获得较大的施加电压,对实现优异的储能性能具有十分巨大的意义。
Description
技术领域
本发明涉及电子功能材料技术领域,具体涉及一种高储能锆酸铅基反铁电多层陶瓷电容器及其制备方法。
背景技术
随着电子电路的小型化、集成化和多功能化,作为高功率密度大容量电容器的基础,高储能密度、高效率材料是当前大力发展的一种关键新能源材料。介电电容器作为微电子元器件的关键组成,对电力电子、脉冲功率等领域的发展具有重要的推动作用,已成为当前脉冲功率技术领域研究的重点。介电电容器的性能主要由介电材料决定,但是当前的商用介电材料具有相对较低的能量密度,这严重阻碍了其潜在的应用。因此,寻求高储能表现电容器为是本领域技术人员亟需解决的问题。
锆酸铅基反铁电材料由于其特有的介电性能和相变特性,是一种理想的储能电介质。在铅基反铁电体中,偶极子反向平行排列,在电场作用下可发生反转,此时反铁电相转换为铁电相,伴随着相变,介质的极化强度将突增;当去除所施加的电场,则偶极子再度反向排列,被诱导的铁电态又重新回到反铁电态,剩余极化强度为零,所存储的电荷被全部快速释放出来,这一特性使得反铁电材料在高功率密度电容器应用领域具有独特的优势,是一类有希望被用来开发高功率密度大容量电容器的关键材料。
发明内容
针对现有技术中的缺陷,本发明提供一种高储能锆酸铅基反铁电反铁电材料,该材料具有高的储能密度与储能效率,有利于高功率大容量存储电容器件的开发和应用。
为了实现上述目的,本发明采用了如下的技术方案:
本发明的一个目的是提供一种锆酸铅基反铁电厚膜陶瓷材料,其化学通式为(Pb0.98-xLa0.02Cax)(Zr0.7Sn0.3)0.995O3,其中,x的取值范围为:4%≦x≦6%。
本发明的又一个目的是提供上述的锆酸铅基反铁电厚膜陶瓷材料的制备方法,包括以下步骤:
(1)按照所述锆酸铅基反铁电多层电容器的组成化学式,称取四氧化三铅、氧化镧、碳酸钙、氧化锆和氧化锡,作为原料粉体;
(2)将所述原料粉体进行第一次球磨,烘干,在900-1000℃下保温2-4h,然后进行第二次球磨,烘干,得到锆酸铅基反铁电陶瓷粉体;
(3)将锆酸铅基反铁电陶瓷粉体与溶剂、分散剂混合,加入锆球球磨得到初级浆料;
(4)向所述初级浆料中加入粘结剂、均质剂球磨,得到最终浆料;
(5)对所述最终浆料进行脱泡处理,流延成膜,干燥后得到锆酸铅基反铁电陶瓷厚膜。
具体按照摩尔比(0.98-x):0.02:x:0.7*0.995:0.3*0.995计算出所需各种药品质量。
优选地,步骤(2)中,所述第一次球磨时加入了锆球、酒精与所述原料粉体进行球磨,所述原料粉体:锆球:酒精的质量比为1:2:1,烘干温度为80-120℃,烘干时间为5-10h,球磨时间为12-24h;所述第二次球磨时加入了锆球、酒精与粉体进行球磨,粉体:锆球:酒精的质量比为1:2:1,烘干温度为80-120℃,烘干时间为5-10h,球磨时间为12-24h。
进一步优选地,所述锆球的直径为1-5mm。
优选地,所述溶剂为甲苯-乙醇,所述分散剂为磷酸三丁酯,所述锆酸铅基反铁电陶瓷粉体与锆球的质量比为1:2,球磨时间为6-12h;其中,所述锆酸铅基反铁电陶瓷粉体的重量份数为60份-62份,甲苯-乙醇的重量份数为20份-22份,磷酸三丁酯的重量份数为0.8份-1份。
优选地,所述粘结剂为聚乙烯醇缩丁醛酯,所述均质剂为聚乙二醇-邻苯二甲酸丁酯和环乙酮,球磨时间为6-12h;其中,聚乙烯醇缩丁醛酯重量份数为4.5份-5份,聚乙二醇-邻苯二甲酸丁酯重量份数为2份-2.5份,环乙酮的重量份数为1.2份-1.6份。
优选地,所述步骤(5)的具体操作为:通过真空除泡法除泡,除泡时间为30-90min,然后经过流延机流延,室温下干燥12-24h后得到厚度为20-40μm的(Pb0.98-xLa0.02Cax)(Zr0.7Sn0.3)0.995O3厚膜。
本发明的又一个目的是提供一种锆酸铅基反铁电多层电容器的制备方法,包括以下步骤:
S1、将上述的锆酸铅基反铁电厚膜陶瓷材料切片,通过丝网印刷机在裁剪好的膜带上印刷铂电极;
S2、然后将带有电极的膜带重叠热压,得到多层膜,并在所述多层膜的上下各设置10层-20层所述膜带,得到电容器坯体;
S3、采用冷等静压机将热压后的电容器坯体进行冷等静压;
S4、在500-600℃下保温300-500min排胶,然后在箱式炉进行烧结,冷却,得到所述锆酸铅基反铁电多层电容器。
优选地,所述重叠热压的条件为:压力为50-100MPa,温度为60-80℃,每一叠层保压10-30min;所述冷等静压的压力为100-200MPa,保压10-20min。
优选地,烧结的条件为:1020-1180℃,保温2-4h。
本发明还提供了上述方法制备得到的锆酸铅基反铁电多层电容器。
发明的附加方面和优点将在下面的描述中部分给出,部分将从下面的描述中变得明显,或通过本发明的实践了解到。
附图说明
为了更清楚地说明本发明具体实施方式或现有技术中的技术方案,下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍。在所有附图中,类似的元件或部分一般由类似的附图标记标识。附图中,各元件或部分并不一定按照实际的比例绘制。
图1为本发明实施例的反铁电多层陶瓷电容器的P-E图谱;
图2为本发明实施例1、2、3和对比例1制备得到的反铁电多层陶瓷电容器的的储能密度和储能效率图。
具体实施方式
下面将结合附图对本发明技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本发明的技术方案,因此只作为示例,而不能以此来限制本发明的保护范围。
需要注意的是,除非另有说明,本申请使用的技术术语或者科学术语应当为本发明所属领域技术人员所理解的通常意义。
下面的实施例中的实验方法,如无特殊说明,均为常规方法。下述实施例中所用的试验材料,如无特殊说明,均为自常规生化试剂商店购买得到。以下实施例中的定量试验,均设置三次重复实验,数据为三次重复实验的平均值或平均值±标准差。
实施例1
本实施例提供了一种(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器,所述(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器制备方法包括如下步骤,
步骤S1:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体;
步骤S2:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3厚膜;
步骤S3:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器;
根据本发明的一个示例,步骤S1具体包括:
步骤S101:按照0.92:0.02:0.06:0.7*0.995:0.3*0.995的摩尔比计算出所需各种药品质量,称量好置于尼龙球磨罐中,加入酒精和锆球,其中粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合24h,然后取出放在烘箱中以100℃烘干9h,其中锆球直径为1mm;
步骤S102:将烘干的粉体置于Al2O3干锅中,然后放入箱式炉中进行预烧,其预烧工艺为:从室温以3℃/min的升温速率至900℃,并在900℃下保温2h,然后随炉降至室温;
步骤S103:将预烧后的粉体用玛瑙研钵捣碎,然后置于尼龙球磨罐中,加入锆球和酒精,其中,粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合24h;
步骤S104:得到均匀的粉体酒精悬浊液放入砂磨机中砂磨1h,转速为2600转/min,然后取出放在烘箱中以100℃烘干9h,其中锆球直径为1mm;
步骤S105:砂磨后将其在箱中烘干,温度为100℃烘干9h,得到干燥的(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体。
根据本发明的一个示例,步骤S2具体包括:
步骤S201:将60.1重量份(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体与31重量份溶剂甲苯-乙醇,0.9重量份分散剂磷酸三丁酯加入锆球置于尼龙球磨罐中球磨12h得到到初级浆料;其中粉体质量:锆球质量=1:2,球磨转速为200转/min,甲苯-乙醇的溶剂中,甲苯与乙醇的质量比为2:1;
步骤S202:然向初级浆料加入4.5重量份粘结剂聚乙烯醇缩丁醛酯,2.4重量份增塑剂聚乙二醇-400和邻苯二甲酸酯,1.4重量份均质剂环乙酮,然后再一次球磨6h得到最终浆料,转速为200转/min,增塑剂聚乙二醇-400和邻苯二甲酸酯质量比为1:1;
步骤S203:将最终浆料通过真空除泡及去除泡,除泡时间大概为45min,然后通过流延机以37cm/min的流延速率下进行流延,室温下干燥后24h得到(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3厚膜,干燥后的流延膜生带的的厚度为约20μm。
根据本发明的一个示例,步骤S3具体包括:
步骤S301:将干燥后的膜带通过裁片机裁剪成边长为15cm的正方形;
步骤S302:然后通过丝网印刷机在裁剪好的膜带印刷上铂电极;
步骤S303:将带有电极的膜带利用层压机叠在一起得到多层膜,一共叠六层,为了防止烧出的电容器弯曲,在叠好的六层膜上下分别各放10层没有印刷电极的膜带,压力80MPa,温度为70℃,每一叠层保压10min;
步骤S304:采用冷等静压机将干压后的电容器坯体进行冷等静压,先将热压后的电容器坯体用严密包裹,保证其不会进油,然后将其置于冷等静压机的油中,采用压力为200MPa,保压10min,然后将其从保鲜膜中拆出;
步骤S305:用箱式炉在500℃下保温300min进行排胶,升温速率为0.5℃/min,随炉冷却;
步骤S306:然后以3℃/min升温到1160℃,保温2h在箱式炉进行烧结,降温速率为5℃/min,降到200℃,然后随炉冷却,得到(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器。
步骤S307:烧结后的多层陶瓷电容器两端涂上银电极,在箱式炉进行烧端,工艺为:5℃/min升温到600℃,保温10min,随炉冷却。
实施例2
本实施例提供了一种(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器,所述(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器制备方法包括如下步骤,
步骤S1:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体;
步骤S2:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3厚膜;
步骤S3:制备(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器;
根据本发明的一个示例,步骤S1具体包括:
步骤S101:0.92:0.02:0.06:0.7*0.995:0.3*0.995计算出所需各种药品质量,称量好置于尼龙球磨罐中,加入酒精和锆球,其中粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合18h,然后取出放在烘箱中以100℃烘干9h,其中锆球直径为1mm;
步骤S102:将烘干的粉体置于Al2O3干锅中,然后放入箱式炉中进行预烧,其预烧工艺为:从室温以3℃/min的升温速率至910℃,并在910℃下保温2h,然后随炉降至室温;
步骤S103:将预烧后的粉体用玛瑙研钵捣碎,然后置于尼龙球磨罐中,加入锆球和酒精,其中,粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合18h;
步骤S104:得到均匀的粉体酒精悬浊液放入砂磨机中砂磨40min,转速为2600转/min,然后取出放在烘箱中以100℃烘干9h,其中锆球直径为1mm;
步骤S105:砂磨后将其在箱中烘干,温度为100℃烘干9h,得到干燥的(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体。
根据本发明的一个示例,步骤S2具体包括:
步骤S201:将60.1重量份(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3粉体与31重量份溶剂甲苯-乙醇,0.9重量份分散剂磷酸三丁酯加入锆球置于尼龙球磨罐中球磨12h得到到初级浆料;其中粉体质量:锆球质量=1:2,球磨转速为200转/min,甲苯-乙醇的溶剂中,甲苯与乙醇的质量比为2:1;
步骤S202:然向初级浆料加入4.5重量份粘结剂聚乙烯醇缩丁醛酯,2.4重量份增塑剂聚乙二醇-400和邻苯二甲酸酯,1.4重量份均质剂环乙酮,然后再一次球磨6h得到最终浆料,转速为200转/min,增塑剂聚乙二醇-400和邻苯二甲酸酯质量比为1:1;
步骤S203:将最终浆料通过真空除泡及去除泡,除泡时间大概为50min,然后通过流延机以37cm/min的流延速率下进行流延,室温下干燥后24h得到(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3厚膜,干燥后的流延膜生带的的厚度为约30μm。
根据本发明的一个示例,步骤S3具体包括:
步骤S301:将干燥后的膜带通过裁片机裁剪成边长为15cm的正方形;
步骤S302:然后通过丝网印刷机在裁剪好的膜带印刷上铂电极;
步骤S303:将带有电极的膜带利用层压机叠在一起得到多层膜,一共叠六层,为了防止烧出的电容器弯曲,在叠好的六层膜上下分别各放10层没有印刷电极的膜带,压力80MPa,温度为70℃,每一叠层保压10min;
步骤S304:采用冷等静压机将干压后的电容器坯体进行冷等静压,先将热压后的电容器坯体用严密包裹,保证其不会进油,然后将其置于冷等静压机的油中,采用压力为200MPa,保压10min,然后将其从保鲜膜中拆出;
步骤S305:用箱式炉在500℃下保温300min进行排胶,升温速率为1℃/min,随炉冷却;
步骤S306:然后以3℃/min升温到1140℃,保温3h在箱式炉进行烧结,降温速率为5℃/min,降到200℃,然后随炉冷却,得到(Pb0.92La0.02Ca0.06)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器。
步骤S307:烧结后的多层陶瓷电容器两端涂上银电极,在箱式炉进行烧端,工艺为:5℃/min升温到600℃,保温10min,随炉冷却。
实施例3
本实施例提供了一种(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器,所述(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O多层陶瓷电容器制备方法包括如下步骤,步骤S1:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体;
步骤S2:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3厚膜;
步骤S3:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器;
根据本发明的一个示例,步骤S1具体包括:
步骤S101:0.94:0.02:0.04:0.7*0.995:0.3*0.995计算出所需各种药品质量,称量好置于尼龙球磨罐中,加入酒精和锆球,其中粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合18h,然后取出放在烘箱中以100℃烘干12h,其中锆球直径为1mm;
步骤S102:将烘干的粉体置于Al2O3干锅中,然后放入箱式炉中进行预烧,其预烧工艺为:从室温以3℃/min的升温速率至950℃,并在950℃下保温2h,然后随炉降至室温;
步骤S103:将预烧后的粉体用玛瑙研钵捣碎,然后置于尼龙球磨罐中,加入锆球和酒精,其中,粉体质量:锆球质量:酒精质量=1:2:1,以900转/min混合12h;
步骤S104:得到均匀的粉体酒精悬浊液放入砂磨机中砂磨40min,转速为2600转/min,然后取出放在烘箱中以100℃烘干9h,其中锆球直径为1mm;
步骤S105:砂磨后将其在箱中烘干,温度为100℃烘干9h,得到干燥的(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体。
根据本发明的一个示例,步骤S2具体包括:
步骤S201:将60.1重量份(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体与31.5重量份溶剂甲苯-乙醇,0.9重量份分散剂磷酸三丁酯加入锆球置于尼龙球磨罐中球磨12h得到到初级浆料;其中粉体质量:锆球质量=1:2,球磨转速为200转/min,甲苯-乙醇的溶剂中,甲苯与乙醇的质量比为2:1;
步骤S202:然向初级浆料加入5重量份粘结剂聚乙烯醇缩丁醛酯,2.4重量份增塑剂聚乙二醇-400和邻苯二甲酸酯,1.4重量份均质剂环乙酮,然后再一次球磨6h得到最终浆料,转速为200转/min,增塑剂聚乙二醇-400和邻苯二甲酸酯质量比为1:1;
步骤S203:将最终浆料通过真空除泡及去除泡,除泡时间大概为1h,然后通过流延机以40cm/min的流延速率下进行流延,室温下干燥后24h得到(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3厚膜,干燥后的流延膜生带的的厚度为约40μm。
根据本发明的一个示例,步骤S3具体包括:
步骤S301:将干燥后的膜带通过裁片机裁剪成边长为15cm的正方形;
步骤S302:然后通过丝网印刷机在裁剪好的膜带印刷上铂电极;
步骤S303:将带有电极的膜带利用层压机叠在一起得到多层膜,一共叠六层,为了防止烧出的电容器弯曲,在叠好的六层膜上下分别各放5层没有印刷电极的膜带,压力70MPa,温度为70℃,每一叠层保压10min;
步骤S304:采用冷等静压机将干压后的电容器坯体进行冷等静压,先将热压后的电容器坯体用严密包裹,保证其不会进油,然后将其置于冷等静压机的油中,采用压力为200MPa,保压10min,然后将其从保鲜膜中拆出;
步骤S305:用箱式炉在500℃下保温300min进行排胶,升温速率为1℃/min,随炉冷却;
步骤S306:然后以3℃/min升温到1180℃,保温2h在箱式炉进行烧结,降温速率为5℃/min,降到200℃,然后随炉冷却,得到(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3多层陶瓷电容器。
步骤S307:烧结后的多层陶瓷电容器两端涂上银电极,在箱式炉进行烧端,工艺为:5℃/min升温到600℃,保温10min,随炉冷却。
对比例1
本对比例提供了一种(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3陶瓷,所述(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3陶瓷制备方法包括如下步骤,
步骤S1:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体;
步骤S2:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3厚膜;
步骤S3:制备(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3陶瓷;
步骤S1具体包括,
步骤S101:按照摩尔比0.94:0.02:0.04:0.7*0.995:0.3*0.995计算出所需各种药品质量,称量好置于尼龙球磨罐中,加入酒精和锆球,其中粉体质量:锆球质量:酒精质量=1:2:1,以800转/min混合12h,然后取出放在烘箱中以100℃烘干6h,其中锆球直径为2mm;
步骤S102:将烘干的粉体置于Al2O3干锅中,然后放入箱式炉中进行预烧,其预烧工艺为:从室温以3℃/min的升温速率至900℃,并在900℃下保温2h,然后随炉降至室温;
步骤S103:将预烧后的粉体用玛瑙研钵捣碎,然后置于尼龙球磨罐中,加入锆球和酒精,其中,粉体质量:锆球质量:酒精质量=1:2:1,以800转/min混合12h,然后取出放在烘箱中以100℃烘干6h,其中锆球直径为2mm;
步骤S104:得到均匀的粉体酒精悬浊液,将其在箱中烘干,温度为100℃烘干6h,得到干燥的(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体。
步骤S2具体包括,
步骤S201:将60.1重量份(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3粉体与30重量份溶剂甲苯-乙醇,0.9重量份分散剂磷酸三丁酯加入锆球置于尼龙球磨罐中球磨12h得到到初级浆料;其中粉体质量:锆球质量=1:1.5,球磨转速为200转/min,甲苯-乙醇的溶剂中,甲苯与乙醇的质量比为2:1;
步骤S202:然向初级浆料加入5重量份粘结剂聚乙烯醇缩丁醛酯,2.4重量份增塑剂聚乙二醇-400和邻苯二甲酸酯,1.6重量份均质剂环乙酮,然后再一次球磨6h得到最终浆料,转速为200转/min;
步骤S203:将最终浆料通过真空除泡及去除泡,除泡时间为1h,然后通过流延机以40cm/min的流延速率下进行流延,室温下干燥后12h得到(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3厚膜,干燥后的流延膜生带的的厚度为约80μm。
步骤S3具体包括,
步骤S301:将干燥好的流延膜带通过裁片机裁剪成边长为1.4cm的正方形;
步骤S302:取20片裁剪好的膜带叠在一起,然后在模具中热压,温度为70℃,压力为80MPa;
步骤S303:将热压后的陶瓷坯体进行冷等静压。先将热压后的陶瓷坯体用保鲜膜严密包裹,保证其不会进油,然后将其置于冷等静压机的油中,采用压力为200MPa,保压10min,然后将其从保鲜膜中拆出;
步骤S304:将等静压后陶瓷坯体的在500℃下保温300min在箱式炉进行排胶,升温速率为0.5℃/min,随炉冷却;
步骤S305:排胶后以3℃/min升温到1150℃,保温3h在箱式炉进行烧结,降温速率为5℃/min,降到200℃,然后随炉冷却,得到(Pb0.94La0.02Ca0.04)(Zr0.7Sn0.3)0.995O3陶瓷。陶瓷片烧成之后用砂纸将其打磨至100微米厚度,并利用离子溅射将在该铁电陶瓷的表面上喷涂电极材料金。
对上述四种铅基反铁电材料进行分析,所得结果如图1-2以及表1所示(其中的厚度为具体测量数值)。
表1实施例1-3及对比例1铅基反铁电材料性能
参照图1,即按照实施例1、2、3和对比例1的工艺下击穿场强下的P-E图,其中,1对应对比例1得到的铅基反铁电材料,2对应实施例1得到的铅基反铁电材料,3对应实施例2得到的铅基反铁电材料,4对应实施例3得到的铅基反铁电材料。
从此图中可以看出P-E图表现为双电滞回线,展现出反铁电特性。相对于对比例1,实施例1、2和3具有较高的击穿强度,并且储能密度均大于实施例1,可以说明,多层陶瓷电容器具有更高的储能密度,有利于提高储能密度。参照图2,即按照实施例1、2、3和对比例1的工艺下储能密度和储能效率图,从此图中可以看出:相对于陶瓷,多层陶瓷电容器具有更高的储能密度。结果表明,降低多层陶瓷电容器单层厚度利于击穿强度的提高,可以获得更高的储能密度。
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围,其均应涵盖在本发明的权利要求和说明书的范围当中。
Claims (10)
1.锆酸铅基反铁电厚膜陶瓷材料,其特征在于,其化学通式为(Pb0.98-xLa0.02Cax)(Zr0.7Sn0.3)0.995O3,其中,x的取值范围为:4%≦x≦6%。
2.权利要求1所述的锆酸铅基反铁电厚膜陶瓷材料的制备方法,其特征在于,包括以下步骤:
(1)按照所述锆酸铅基反铁电多层电容器的组成化学式,称取四氧化三铅、氧化镧、碳酸钙、氧化锆和氧化锡,作为原料粉体;
(2)将所述原料粉体进行第一次球磨,烘干,在900-1000℃下保温2-4h,然后进行第二次球磨,烘干,得到锆酸铅基反铁电陶瓷粉体;
(3)将锆酸铅基反铁电陶瓷粉体与溶剂、分散剂混合,加入锆球球磨得到初级浆料;
(4)向所述初级浆料中加入粘结剂、均质剂球磨,得到最终浆料;
(5)对所述最终浆料进行脱泡处理,流延成膜,干燥后得到锆酸铅基反铁电陶瓷厚膜。
3.根据权利要求2所述的制备方法,其特征在于,步骤(2)中,所述第一次球磨时加入了锆球、酒精与所述原料粉体进行球磨,所述原料粉体:锆球:酒精的质量比为1:2:1,烘干温度为80-120℃,烘干时间为5-10h,球磨时间为12-24h;所述第二次球磨时加入了锆球、酒精与粉体进行球磨,粉体:锆球:酒精的质量比为1:2:1,烘干温度为80-120℃,烘干时间为5-10h,球磨时间为12-24h。
4.根据权利要求3所述的制备方法,其特征在于,所述锆球的直径为1-5mm。
5.根据权利要求2所述的制备方法,其特征在于,所述溶剂为甲苯-乙醇,所述分散剂为磷酸三丁酯,所述锆酸铅基反铁电陶瓷粉体与锆球的质量比为1:2,球磨时间为6-12h;其中,所述锆酸铅基反铁电陶瓷粉体的重量份数为60份-62份,甲苯-乙醇的重量份数为20份-22份,磷酸三丁酯的重量份数为0.8份-1份。
6.根据权利要求2所述的制备方法,其特征在于,所述粘结剂为聚乙烯醇缩丁醛酯,所述均质剂为聚乙二醇-邻苯二甲酸丁酯和环乙酮,球磨时间为6-12h;其中,聚乙烯醇缩丁醛酯重量份数为4.5份-5份,聚乙二醇-邻苯二甲酸丁酯重量份数为2份-2.5份,环乙酮的重量份数为1.2份-1.6份。
7.根据权利要求2所述的制备方法,其特征在于,所述步骤(5)的具体操作为:通过真空除泡法除泡,除泡时间为30-90min,然后经过流延机流延,室温下干燥12-24h后得到厚度为20-40μm的(Pb0.98-xLa0.02Cax)(Zr0.7Sn0.3)0.995O3厚膜。
8.一种锆酸铅基反铁电多层电容器的制备方法,其特征在于,包括以下步骤:
S1、将权利要求1所述的锆酸铅基反铁电厚膜陶瓷材料切片,通过丝网印刷机在裁剪好的膜带上印刷铂电极;
S2、然后将带有电极的膜带重叠热压,得到多层膜,并在所述多层膜的上下各设置10层-20层所述膜带,得到电容器坯体;
S3、采用冷等静压机将热压后的电容器坯体进行冷等静压;
S4、在500-600℃下保温300-500min排胶,然后在箱式炉进行烧结,冷却,得到所述锆酸铅基反铁电多层电容器。
9.根据权利要求8所述的制备方法,其特征在于,所述重叠热压的条件为:压力为50-100MPa,温度为60-80℃,每一叠层保压10-30min;所述冷等静压的压力为100-200MPa,保压10-20min;烧结的条件为:1020-1180℃,保温2-4h。
10.权利要求8或9制备得到的锆酸铅基反铁电多层电容器。
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