CN111761686A - Ysz电解质制备材料、流延片、制备方法及气体传感器 - Google Patents
Ysz电解质制备材料、流延片、制备方法及气体传感器 Download PDFInfo
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Abstract
一种YSZ电解质制备材料、流延片、制备方法及气体传感器,该YSZ电解质制备材料按照质量百分比计,包括以下组分:氧化锆粉体31%~70%;氧化钇粉体1%~6%;无机添加剂0.5%~4%;有机溶剂24%~45%;有机载体2.5%~6%;有机助剂2%~8%;所述有机载体选自聚丙烯酸树脂、聚乙烯醇缩丁醛、已二酸二辛酯、癸二酸二丁酯、邻苯二甲酸二丁酯中的至少一种。由该材料制备可制备得到较好的强度、密度,收缩匹配合适,较好高温电导性的YSZ电解质,提高使用YSZ电解质的气体传感器如氧传感器、氮氧传感器的性能。
Description
技术领域
本发明涉及氧化钇稳定氧化锆(YSZ)电解质制备材料、制备方法及气体传感器。
背景技术
氧化钇稳定氧化锆(YSZ)是一种在高温下具有较高氧离子导电性的固态电解质,广泛应用于氧传感器、氮氧传感器、SOFC等领域。其中,氮氧传感器芯片内部具有加热丝,在外加加热电压的情况下实现自发热,将芯片加热到工作温度,高温下YSZ内部存在大量氧离子空位,此时YSZ具有高温电导性。当汽车尾气(含有O2、NOX等)进入内部空腔后,在金属电极以及金属电极两端施加的电压作用下,在三相界面处检测气体得到电子分解出氧离子,由于YSZ内部具有大量氧离子空位,使得氧离子能传导到公共电极,在公共电极三相界面处失去电子生成氧气释放至外界。在此过程中,氧离子的传导形成了电流,电流的大小取决于氧离子传导的数量,因此通过检测电流的大小,即可间接检测汽车尾气NOX含量,为SCR催化剂的喷射量提供依据,从而实现对汽车尾气氮氧化合物排放量控制。而氧传感器的工作机理与氮氧传感器类似,利用YSZ固态电解质的高温氧离子传导性的特点,对汽车尾气中O2含量进行检测,进而转化为电信号反馈给ECU,为燃油的喷射量提供依据。
由此可知,在氧传感器和氮氧传感器中,YSZ固态电解质起到了非常重要的作用,而YSZ流延片的性能很大程度影响氧传感器和氮氧传感器的性能。
以上背景技术内容的公开仅用于辅助理解本发明的发明构思及技术方案,其并不必然属于本专利申请的现有技术,在没有明确的证据表明上述内容在本专利申请的申请日已经公开的情况下,上述背景技术不应当用于评价本申请的新颖性和创造性。
发明内容
本发明的主要目的在于克服现有技术的上述缺陷,提供一种YSZ电解质制备材料以及YSZ电解质的制备方法,以制备收缩率匹配、密度、强度较好的YSZ电解质,提高具有该YSZ电解质的气体传感器的抗弯强度、抗热震性等性能。
为实现上述目的,本发明采用以下技术方案:
一种YSZ电解质制备材料,按照质量百分比计,包括以下组分:
其中,所述有机载体包括聚丙烯酸树脂、聚乙烯醇缩丁醛、已二酸二辛酯、癸二酸二丁酯、邻苯二甲酸二丁酯中的至少一种。
进一步地:
所述无机添加剂包括ZnO、Al2O3、CaO、MgO、SiO2、CeO2、Sc2O3中的至少一种;所述有机溶剂包括异丙醇、醋酸丙酯、乙醇、异丁醇、乙酸乙酯、乙二醇丁醚、二甲基乙酰胺、环己酮、三氯乙烯中的至少一种。
所述氧化锆粉体的粒径分布D50为0.1μm~0.8μm。
所述氧化钇粉体的粒径分布D50为0.1μm~0.5μm。
所述有机助剂包括分散剂、增塑剂、消泡剂、脱膜剂、流平剂中的至少一种。
所述分散剂为聚酯共聚物,在所述YSZ电解质制备材料中的质量百分比为0.4%~1.5%。
所述增塑剂为邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物或聚己二酸类,在所述YSZ电解质制备材料中的质量百分比为1.3%~3.5%。
所述消泡剂为破泡聚合物和聚硅氧烷溶液,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%。
所述脱膜剂为表面活性物与聚合物的混合物,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%。
所述流平剂为聚醚改性甲基烷基聚硅氧烷共聚物,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%。
一种YSZ电解质的制备方法,包括以下步骤:
(1)将所述氧化锆粉体、所述氧化钇粉体、所述无机添加剂、所述有机溶剂、所述有机助剂球磨12~36小时得到混合物;
(2)向所述混合物中加入所述有机载体和所述有机助剂,继续球磨12~36小时得到预浆料;
(3)将所述预浆料经过100~400目过滤网过滤,经过脱泡1~5小时、陈腐0.5~2小时后得到流延浆料;
(4)将所述流延浆料进行流延成型,刀高100~500μm,流延速度为0.5~3米/分钟,烘干温度为40~110℃,得到所述YSZ电解质。
进一步地,流延成型的承载膜为PET膜。
一种使用所述的YSZ电解质制备材料制备的流延片。
一种气体传感器,包含所述流延片制备的YSZ电解质。
进一步地,所述气体传感器为氧传感器或氮氧传感器。
本发明具有如下有益效果:
本发明提供一种YSZ电解质制备材料,该YSZ电解质制备材料以氧化锆作为主粉体材料,还包括氧化钇、无机添加剂、有机溶剂、有机载体、有机助剂,通过添加所述有机载体并辅以有机助剂等组分,有利于使制备的YSZ电解质具有较好的成膜性、素坯强度和收缩性能,尤其是能够与氧传感器和氮氧传感器的其它材料烧结很好地匹配。由于该YSZ电解质的收缩率匹配,密度、强度好,用作氧传感器和氮氧传感器的YSZ电解质,能够提高氧传感器和氮氧传感器的抗弯强度、抗热震性等性能。
本发明实施例中,通过添加氧化铝、二氧化硅等来进一步提高产品抗热震性,且降低烧结温度。
本发明实施例中,通过在纳米氧化锆粉体中添加适量氧化钇,使YSZ电解质具有较高的高温电导率,使氧传感器和氮氧传感器灵敏性较好,同时,抗热震性也满足产品要求。
本发明实施例中,增塑剂、分散剂、流平剂等适量添加,也进一步提高了流延片的成膜性、素坯强度和收缩性能。
本发明实施例中,浆料采用球磨方式混合均匀,合适的转速、球料比、球磨时间确保了浆料能分散均匀,然后通过过滤网过滤,将浆料中不易分散的团聚体过滤掉,避免混入浆料中影响流延外观,脱泡能使浆料达到流延所需的粘度,陈腐能使脱泡后的浆料进一步均质化以及进一步消除内部混入的气泡,避免流延出现条纹、气孔气泡等外观不良。
本发明制备的YSZ电解质流延片外观良好,致密无气孔,应用于氧传感器和氮氧传感器能进一步提高其机械性能、电性能,且原料易得、环保,制备工艺简单,适合规模化生产,具有很好的应用前景。
附图说明
图1是本发明实施例1制备的YSZ电解质流延片烧结后的表面SEM图。
图2是本发明实施例1制备的YSZ电解质流延片烧结后的断面SEM图。
图3是本发明实施例1制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
图4是本发明实施例2制备的YSZ电解质流延片烧结后的表面SEM图。
图5是本发明实施例2制备的YSZ电解质流延片烧结后的断面SEM图。
图6是本发明实施例2制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
图7是本发明实施例3制备的YSZ电解质流延片烧结后的表面SEM图。
图8是本发明实施例3制备的YSZ电解质流延片烧结后的断面SEM图。
图9是本发明实施例3制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
具体实施方式
以下对本发明的实施方式做详细说明。应该强调的是,下述说明仅仅是示例性的,而不是为了限制本发明的范围及其应用。
由于氧传感器和氮氧传感器采用氧化锆、铂金、氧化铝等多种材料,YSZ电解质的收缩影响产品的烧结匹配性。YSZ电解质的烧结强度、密度、抗热震性等影响氧传感器和氮氧传感器的机械性能。此外,YSZ电解质中无机添加剂配比影响氧传感器和氮氧传感器的泵氧能力。
为了获得较好的强度、密度,收缩匹配合适,较好高温电导性的YSZ电解质,提高使用YSZ电解质的气体传感器如氧传感器、氮氧传感器的性能,本发明实施例提供一种YSZ电解质制备材料,按照质量百分比计,包括以下组分:氧化锆粉体31%~70%;氧化钇粉体1%~6%;无机添加剂0.5%~4%;有机溶剂24%~45%;有机载体2.5%~6%;有机助剂2%~8%;所述有机载体选自聚丙烯酸树脂、聚乙烯醇缩丁醛、已二酸二辛酯、癸二酸二丁酯、邻苯二甲酸二丁酯中的至少一种。
在优选的实施例中,所述无机添加剂选自ZnO、Al2O3、CaO、MgO、SiO2、CeO2、Sc2O3中的至少一种。
在优选的实施例中,所述有机溶剂选自异丙醇、醋酸丙酯、乙醇、异丁醇、乙酸乙酯、乙二醇丁醚、二甲基乙酰胺、环己酮、三氯乙烯中的至少一种;。
在优选的实施例中,所述氧化锆粉体的粒径分布D50为0.1μm~0.8μm。
在优选的实施例中,所述氧化钇粉体的粒径分布D50为0.1μm~0.5μm。
在优选的实施例中,所述有机助剂包括分散剂、增塑剂、消泡剂、脱膜剂、流平剂中的至少一种。
在优选的实施例中,所述分散剂为聚酯共聚物,所述YSZ电解质制备材料中分散剂的质量百分比为0.4%~1.5%。
在优选的实施例中,所述增塑剂为邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物或聚己二酸类,所述YSZ电解质制备材料中增塑剂的质量百分比为1.3%~3.5%。
在优选的实施例中,所述消泡剂为破泡聚合物和聚硅氧烷溶液,所述YSZ电解质制备材料中消泡剂的质量百分比为0.1%~1%。
在优选的实施例中,所述脱膜剂为表面活性物与聚合物的混合物,所述YSZ电解质制备材料中脱膜剂的质量百分比为0.1%~1%。
在优选的实施例中,所述流平剂为聚醚改性甲基烷基聚硅氧烷共聚物,所述YSZ电解质制备材料中流平剂的质量百分比为0.1%~1%。
本发明实施例提供一种YSZ电解质的制备方法,包括以下步骤:
将所述氧化锆粉体、氧化钇粉体、无机添加剂、有机溶剂、有机助剂球磨12~36小时得到混合物;
向所述混合物中加入所述有机载体、有机助剂,继续球磨12~36小时得到预浆料;
将所述预浆料经过100~400目过滤网过滤,经过真空脱泡机脱泡1~5小时、陈腐0.5~2小时后得到流延浆料;
将所述流延浆料通过流延机进行成型,承载膜为PET膜,刀高100~500μm,流延速度为0.5~3米/分钟,烘干温度为40~110℃,得到流延片形式的YSZ电解质。
在优选的实施例中,YSZ电解质流延片厚度为30μm~250μm,素坯密度为2.5g/cm3~4.0g/cm3,收缩率为16%~28%。
本发明实施例还提供一种使用所述YSZ电解质制备材料制备的流延片。
本发明实施例还提供一种气体传感器,可以是例如氧传感器或氮氧传感器,其包含所述流延片制备的YSZ电解质。
以下进一步描述具体实施例。
实施例1:
本实施例中,YSZ电解质流延片浆料,由如下质量百分比含量的组分组成:
氧化锆粉体:51.57%,D50:0.5987μm;
氧化钇粉体:2.88%,D50:0.1624μm;
无机添加剂:0.56%的Al2O3;
有机溶剂:35.93%的异丁醇和醋酸丙酯的混合物,其中质量比异丁醇:醋酸丙酯=4.9:1;
有机载体:5.4%的聚丙烯酸树脂和已二酸二辛酯的混合物,其中质量比聚丙烯酸树脂:已二酸二辛酯=1:1;
有机助剂:0.88%的分散剂(聚酯共聚物)、1.88%的增塑剂(邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物)、0.4%的消泡剂(破泡聚合物和聚硅氧烷溶液)、0.5%的脱膜剂(表面活性物与聚合物的混合物)。
利用上述浆料制备YSZ电解质流延片的方法步骤如下:
(1)按质量比称取氧化锆粉体、氧化钇粉体、氧化铝粉体加入行星球磨中,以异丁醇、醋酸丙酯为溶剂,以聚酯共聚物为分散剂,上述混合物球磨18小时;
(2)按质量比称取有机载体(聚丙烯酸树脂和已二酸二辛酯的混合物)、增塑剂(邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物)、消泡剂(破泡聚合物和聚硅氧烷溶液)、脱膜剂(表面活性物与聚合物的混合物)加入上述混合物中,继续球磨18小时;
(3)利用200目尼龙网将球磨好的浆料过滤到容器中,真空脱泡机脱泡1.5小时,陈腐0.5小时得到流延浆料;
(4)采用流延机将上述浆料流延成所需YSZ电解质流延片,承载膜为PET膜,流延刀高150μm,流延速度2米/分钟,一区温度45℃,二区温度60℃,三区温度85℃;
经过上述步骤,即可得到厚度约30μm、柔韧性、强度较好的流延片,该流延片素坯密度约3.6g/cm3。
将所制得的YSZ电解质流延片应用于氧传感器和氮氧传感器制备,烧结温度1450℃,保温2小时,烧结后收缩率约19.5%,与绝缘浆料、铂金电极烧结匹配无开裂,瓷体表面、内部致密,无明显气孔,烧结密度达到理论密度96%以上,产品三点抗弯强度大于700MPa,产品机械性能、电性能明显提高。图1是本发明实施例1制备的YSZ电解质流延片烧结后的表面SEM图。图2是本发明实施例1制备的YSZ电解质流延片烧结后的断面SEM图。图3是本发明实施例1制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
实施例2:
本实施例中,YSZ电解质流延片浆料,由如下质量百分比含量的组分组成:
氧化锆粉体:47.6%,D50:0.6491μm;
氧化钇粉体:3.64%,D50:0.1624μm;
无机添加剂:1.59%的Al2O3~SiO2~MgO~CaO,其中质量比Al2O3:SiO2:MgO:CaO=29:21:2:1;
有机溶剂:39.24%的异丁醇、醋酸丙酯、乙酸乙酯和乙醇的混合物,其中质量比异丁醇:醋酸丙酯:乙酸乙酯:乙醇=3:1:7.6:6;
有机载体:5.02%的聚乙烯醇缩丁醛和癸二酸二丁酯的混合物,其中质量比聚乙烯醇缩丁醛:癸二酸二丁酯=3:1;
有机助剂:1.02%的分散剂(聚酯共聚物)、1.39%的增塑剂(邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物)、0.2%的脱膜剂(表面活性物与聚合物的混合物)、0.3%的流平剂(聚醚改性甲基烷基聚硅氧烷共聚物)。
利用上述浆料制备YSZ电解质流延片的方法步骤如下:
(1)按质量比称取氧化锆粉体、氧化钇粉体、氧化铝粉体、二氧化硅粉体、氧化镁粉体、氧化钙粉体加入行星球磨中,以异丁醇、醋酸丙酯、乙酸乙酯、乙醇为溶剂,以聚酯共聚物为分散剂,上述混合物球磨24小时;
(2)按质量比称取有机载体(聚乙烯醇缩丁醛和癸二酸二丁酯的混合物)、增塑剂(邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物)、脱膜剂(表面活性物与聚合物的混合物)、流平剂(聚醚改性甲基烷基聚硅氧烷共聚物)加入上述混合物中,继续球磨24小时;
(3)利用200目尼龙网将球磨好的浆料过滤到容器中,真空脱泡机脱泡1小时,陈腐0.5小时得到流延浆料;
(4)采用流延机将上述浆料流延成所需YSZ电解质流延片,承载膜为PET膜,流延刀高250μm,流延速度1.5米/分钟,一区温度45℃,二区温度70℃,三区温度90℃;
经过上述步骤,即可得到厚度约60μm、柔韧性、强度较好的流延片,该流延片素坯密度约3.7g/cm3。
将所制得的YSZ电解质流延片应用于氧传感器和氮氧传感器制备,烧结温度1450℃,保温2小时,烧结后收缩率约18%,与绝缘浆料、铂金电极烧结匹配无开裂,瓷体表面、内部致密,无明显气孔,烧结密度达到理论密度96%以上,产品三点抗弯强度大于680MPa,产品机械性能、电性能明显提高。图4是本发明实施例2制备的YSZ电解质流延片烧结后的表面SEM图。图5是本发明实施例2制备的YSZ电解质流延片烧结后的断面SEM图。图6是本发明实施例2制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
实施例3:
本实施例中,YSZ电解质流延片浆料,由如下质量百分比含量的组分组成:
氧化锆粉体:48.17%,D50:0.1345μm;
氧化钇粉体:4.70%,D50:0.1624μm;
无机添加剂:2.81%的Al2O3~SiO2~MgO~CaO,其中质量比Al2O3:SiO2:MgO:CaO=90:2:1:1;
有机溶剂:35.24%的二甲基乙酰胺、醋酸丙酯和异丁醇的混合物,其中质量比二甲基乙酰胺:醋酸丙酯:异丁醇=3.6:1:3;
有机载体:4.56%的聚乙烯醇缩丁醛、癸二酸二丁酯和已二酸二辛酯的混合物,其中质量比聚乙烯醇缩丁醛:癸二酸二丁酯:已二酸二辛酯=2:1:1;
有机助剂:1.07%的分散剂(聚酯共聚物),1.45%的增塑剂(聚己二酸类),0.5%的消泡剂(破泡聚合物和聚硅氧烷溶液)、0.8%的脱膜剂(表面活性物与聚合物的混合物)、0.7%的流平剂(聚醚改性甲基烷基聚硅氧烷共聚物)。
利用上述浆料制备YSZ电解质流延片的方法步骤如下:
(1)按质量比称取氧化锆粉体、氧化钇粉体、氧化铝粉体、二氧化硅粉体、氧化镁粉体、氧化钙粉体加入行星球磨中,以二甲基乙酰胺、醋酸丙酯、异丁醇为溶剂,以聚酯共聚物为分散剂,上述混合物球磨36小时;
(2)按质量比称取有机载体(聚乙烯醇缩丁醛、癸二酸二丁酯和已二酸二辛酯的混合物)、增塑剂(聚己二酸类)、消泡剂(破泡聚合物和聚硅氧烷溶液)、脱膜剂(表面活性物与聚合物的混合物)、流平剂(聚醚改性甲基烷基聚硅氧烷共聚物)加入上述混合物中,继续球磨36小时;
(3)利用300目尼龙网将球磨好的浆料过滤到容器中,真空脱泡机脱泡2小时,陈腐1小时得到流延浆料;
(4)采用流延机将上述浆料流延成所需YSZ电解质流延片,承载膜为PET膜,流延刀高450μm,流延速度1米/分钟,一区温度50℃,二区温度75℃,三区温度90℃;
经过上述步骤,即可得到厚度约120μm、柔韧性、强度较好的流延片,该流延片素坯密度约3.6g/cm3。
将所制得的YSZ电解质流延片应用于氧传感器和氮氧传感器制备,烧结温度1450℃,保温2小时,烧结后收缩率约20%,与绝缘浆料、铂金电极烧结匹配无开裂,瓷体表面、内部致密,无明显气孔,烧结密度达到理论密度96%以上,产品强度大于650MPa,产品机械性能、电性能明显提高。图7是本发明实施例3制备的YSZ电解质流延片烧结后的表面SEM图。图8是本发明实施例3制备的YSZ电解质流延片烧结后的断面SEM图。图9是本发明实施例3制备的YSZ电解质流延片与铂金电极共烧后的SEM图。
本发明的背景部分可以包含关于本发明的问题或环境的背景信息,而不一定是描述现有技术。因此,在背景技术部分中包含的内容并不是申请人对现有技术的承认。
以上内容是结合具体/优选的实施方式对本发明所作的进一步详细说明,不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说,在不脱离本发明构思的前提下,其还可以对这些已描述的实施方式做出若干替代或变型,而这些替代或变型方式都应当视为属于本发明的保护范围。在本说明书的描述中,参考术语“一种实施例”、“一些实施例”、“优选实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。在不相互矛盾的情况下,本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。尽管已经详细描述了本发明的实施例及其优点,但应当理解,在不脱离专利申请的保护范围的情况下,可以在本文中进行各种改变、替换和变更。
Claims (10)
2.根据权利要求1所述的YSZ电解质制备材料,其特征在于,所述无机添加剂包括ZnO、Al2O3、CaO、MgO、SiO2、CeO2、Sc2O3中的至少一种;所述有机溶剂包括异丙醇、醋酸丙酯、乙醇、异丁醇、乙酸乙酯、乙二醇丁醚、二甲基乙酰胺、环己酮、三氯乙烯中的至少一种。
3.根据权利要求1所述的YSZ电解质制备材料,其特征在于,所述氧化锆粉体的粒径分布D50为0.1μm~0.8μm,所述氧化钇粉体的粒径分布D50为0.1μm~0.5μm。
4.根据权利要求1所述的YSZ电解质制备材料,其特征在于,所述有机助剂包括分散剂、增塑剂、消泡剂、脱膜剂、流平剂中的至少一种。
5.根据权利要求4所述的YSZ电解质制备材料,其特征在于,所述分散剂为聚酯共聚物,在所述YSZ电解质制备材料中的质量百分比为0.4%~1.5%;
所述增塑剂为邻苯二甲酸二丁酯和三甘醇二异辛酸酯的混合物或聚己二酸类,在所述YSZ电解质制备材料中的质量百分比为1.3%~3.5%;
所述消泡剂为破泡聚合物和聚硅氧烷溶液,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%;
所述脱膜剂为表面活性物与聚合物的混合物,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%;
所述流平剂为聚醚改性甲基烷基聚硅氧烷共聚物,在所述YSZ电解质制备材料中的质量百分比为0.1%~1%。
6.一种使用如权利要求1至5任一项所述的YSZ电解质制备材料的YSZ电解质制备方法,其特征在于,包括以下步骤:
(1)将所述氧化锆粉体、所述氧化钇粉体、所述无机添加剂、所述有机溶剂、所述有机助剂球磨12~36小时得到混合物;
(2)向所述混合物中加入所述有机载体和所述有机助剂,继续球磨12~36小时得到预浆料;
(3)将所述预浆料经过100~400目过滤网过滤,经过脱泡1~5小时、陈腐0.5~2小时后得到流延浆料;
(4)将所述流延浆料进行流延成型,刀高100~500μm,流延速度为0.5~3米/分钟,烘干温度为40~110℃,得到所述YSZ电解质。
7.如权利要求6所述的YSZ电解质制备方法,其特征在于,流延成型的承载膜为PET膜。
8.一种使用如权利要求1至5任一项所述的YSZ电解质制备材料制备的流延片。
9.一种气体传感器,其特征在于,包含如权利要求8所述的流延片制备的YSZ电解质。
10.如权利要求9所述的气体传感器,其特征在于,所述气体传感器为氧传感器或氮氧传感器。
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