Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Lead-free piezoelectric ceramic with high Curie temperature and preparation method thereof
The invention provides a lead-free piezoelectric ceramic with high Curie temperature and a preparation method thereof, the expression of the lead-free piezoelectric ceramic is Ba (Hf0. 02Ti0. 98) O3-xSiO2, and x is equal to 0-1.5, the preparation method comprises the following steps: weighing BaCO3, TiO2, HfO2 and SiO2 powder according to a ratio, carrying out first ball milling on the weighed powder, then drying, sieving, pre-sintering the powder, then carrying out second ball milling, and finally carrying out second ball milling on the powder to obtain the lead-free piezoelectric ceramic with high Curie temperature. And drying and sieving after ball milling, adding paraffin into the powder for granulation, preparing the granulated ceramic powder into a ceramic blank, putting the ceramic blank into a tubular furnace, and carrying out degumming and sintering to obtain the lead-free piezoelectric ceramic. Ba (Hf0. 02Ti0. 98) O3 (BHT) is selected as a matrix, SiO2 is introduced to be added into a second phase so as to increase the Curie temperature, in the process that SiO2 enters the BHT ceramic matrix, the formed second phase is enriched in the grain boundary in the form of independent grains, and when the temperature rises to be close to the Curie temperature, the second phase can prevent a ferroelectric phase from being converted into a paraelectric phase, so that the purpose of increasing the Curie temperature is achieved.
本发明提出了一种高居里温度的无铅压电陶瓷及其制备方法，所述无铅压电陶瓷的表达式为Ba(Hf0.02Ti0.98)O3‑xSiO2，其中x＝0～1.5，制备方法包括以下步骤：按比例称取BaCO3、TiO2、HfO2、SiO2粉末，将称取好的粉末进行第一次球磨，然后烘干、过筛，将粉末进行预烧，然后进行第二次球磨，球磨后干燥、过筛，在粉末中加入石蜡造粒，将造粒后的陶瓷粉料制成陶瓷坯体，将陶瓷坯体放入管式炉进行排胶、烧结得到无铅压电陶瓷。本发明选用Ba(Hf0.02Ti0.98)O3(BHT)为基体，引入SiO2来加入第二相从而提升居里温度，SiO2进入BHT陶瓷基体的过程中，形成的第二相以独立晶粒的形式富集于晶界，在温度升高至居里温度附近时，第二相会阻碍铁电相转变为顺电相，从而达到提高居里温度的目的。
Lead-free piezoelectric ceramic with high Curie temperature and preparation method thereof
The invention provides a lead-free piezoelectric ceramic with high Curie temperature and a preparation method thereof, the expression of the lead-free piezoelectric ceramic is Ba (Hf0. 02Ti0. 98) O3-xSiO2, and x is equal to 0-1.5, the preparation method comprises the following steps: weighing BaCO3, TiO2, HfO2 and SiO2 powder according to a ratio, carrying out first ball milling on the weighed powder, then drying, sieving, pre-sintering the powder, then carrying out second ball milling, and finally carrying out second ball milling on the powder to obtain the lead-free piezoelectric ceramic with high Curie temperature. And drying and sieving after ball milling, adding paraffin into the powder for granulation, preparing the granulated ceramic powder into a ceramic blank, putting the ceramic blank into a tubular furnace, and carrying out degumming and sintering to obtain the lead-free piezoelectric ceramic. Ba (Hf0. 02Ti0. 98) O3 (BHT) is selected as a matrix, SiO2 is introduced to be added into a second phase so as to increase the Curie temperature, in the process that SiO2 enters the BHT ceramic matrix, the formed second phase is enriched in the grain boundary in the form of independent grains, and when the temperature rises to be close to the Curie temperature, the second phase can prevent a ferroelectric phase from being converted into a paraelectric phase, so that the purpose of increasing the Curie temperature is achieved.
本发明提出了一种高居里温度的无铅压电陶瓷及其制备方法，所述无铅压电陶瓷的表达式为Ba(Hf0.02Ti0.98)O3‑xSiO2，其中x＝0～1.5，制备方法包括以下步骤：按比例称取BaCO3、TiO2、HfO2、SiO2粉末，将称取好的粉末进行第一次球磨，然后烘干、过筛，将粉末进行预烧，然后进行第二次球磨，球磨后干燥、过筛，在粉末中加入石蜡造粒，将造粒后的陶瓷粉料制成陶瓷坯体，将陶瓷坯体放入管式炉进行排胶、烧结得到无铅压电陶瓷。本发明选用Ba(Hf0.02Ti0.98)O3(BHT)为基体，引入SiO2来加入第二相从而提升居里温度，SiO2进入BHT陶瓷基体的过程中，形成的第二相以独立晶粒的形式富集于晶界，在温度升高至居里温度附近时，第二相会阻碍铁电相转变为顺电相，从而达到提高居里温度的目的。
Lead-free piezoelectric ceramic with high Curie temperature and preparation method thereof
一种高居里温度的无铅压电陶瓷及其制备方法
LIU QIBIN (Autor:in) / WANG DUNYING (Autor:in) / REN JUNYU (Autor:in) / TANG GENG (Autor:in) / ZHAO BINGQING (Autor:in) / GUO WENZHE (Autor:in)
03.12.2024
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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