A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Method for preparing bismuth ferrite-barium titanate (BiFeO3-BaTiO3) ceramic through two-step sintering
The invention discloses a method for preparing bismuth ferrite-barium titanate (BiFeO3-BaTiO3) ceramic through two-step sintering, and belongs to the technical field of lead-free ceramic preparation. The preparation method comprises the following steps: calculating and weighing according to a chemical formula (1-x) Bi (1 + y) FeO3-xBaTiO3, ball-milling and mixing, drying, sieving, putting into an alumina crucible, and pre-sintering at 780-950 DEG C for 2-12 hours to obtain pre-sintered powder; carrying out secondary ball milling, drying at 70-120 DEG C, sieving dried powder, adding polyvinyl alcohol with the concentration of 2wt% into the sieved dried powder, carrying out grinding granulation, and putting the granulated powder into a mold for compression molding; placing the ceramic green body in a muffle furnace, heating to 300-440 DEG C, discharging glue for 2-4 hours, heating to 950-1060 DEG C, preserving heat for 1-10 minutes, cooling to 900-1060 DEG C, sintering for 4-12 hours, and cooling to room temperature along with the furnace to prepare the required ceramic. According to the two-step sintering method disclosed by the invention, by ingeniously controlling the two-step sintering temperature and the heat preservation time, an impure phase generation temperature interval in the bismuth ferrite-barium titanate ceramic can be avoided; the prepared ceramic is good in crystallinity, uniform in component, small in grain size, compact in structure, low in dielectric loss, high in insulativity, high in remanent polarization intensity and excellent in piezoelectric property and photovoltaic property.
一种两步烧结制备铁酸铋‑钛酸钡(BiFeO3‑BaTiO3)陶瓷的方法，属于无铅陶瓷制备技术领域。按化学式(1‑x)Bi(1+y)FeO3‑xBaTiO3计算称量，球磨混料，烘干，过筛后置于氧化铝坩埚中，在780～950℃下预烧2～12h得到预烧粉；然后进行二次球磨，再于70～120℃烘干，过筛干燥粉中加入2wt％浓度的聚乙烯醇研磨造粒，造粒粉放入模具中压制成型；将陶瓷坯体置于马弗炉中升温至300～440℃，排胶2～4h后，升温至950～1060℃，保温1～10min，降温至900～1060℃，烧结4～12h，随炉冷却至室温，制备所需陶瓷。本发明所述两步烧结法通过巧妙控制两步烧结温度和保温时间，能避开铁酸铋‑钛酸钡陶瓷中杂相生成温度区间，所制备的陶瓷的结晶性良好、成分均匀、晶粒尺寸细小、结构致密、介电损耗减小、绝缘性高、剩余极化强度大、压电性能和光伏性能优异。
Method for preparing bismuth ferrite-barium titanate (BiFeO3-BaTiO3) ceramic through two-step sintering
The invention discloses a method for preparing bismuth ferrite-barium titanate (BiFeO3-BaTiO3) ceramic through two-step sintering, and belongs to the technical field of lead-free ceramic preparation. The preparation method comprises the following steps: calculating and weighing according to a chemical formula (1-x) Bi (1 + y) FeO3-xBaTiO3, ball-milling and mixing, drying, sieving, putting into an alumina crucible, and pre-sintering at 780-950 DEG C for 2-12 hours to obtain pre-sintered powder; carrying out secondary ball milling, drying at 70-120 DEG C, sieving dried powder, adding polyvinyl alcohol with the concentration of 2wt% into the sieved dried powder, carrying out grinding granulation, and putting the granulated powder into a mold for compression molding; placing the ceramic green body in a muffle furnace, heating to 300-440 DEG C, discharging glue for 2-4 hours, heating to 950-1060 DEG C, preserving heat for 1-10 minutes, cooling to 900-1060 DEG C, sintering for 4-12 hours, and cooling to room temperature along with the furnace to prepare the required ceramic. According to the two-step sintering method disclosed by the invention, by ingeniously controlling the two-step sintering temperature and the heat preservation time, an impure phase generation temperature interval in the bismuth ferrite-barium titanate ceramic can be avoided; the prepared ceramic is good in crystallinity, uniform in component, small in grain size, compact in structure, low in dielectric loss, high in insulativity, high in remanent polarization intensity and excellent in piezoelectric property and photovoltaic property.
一种两步烧结制备铁酸铋‑钛酸钡(BiFeO3‑BaTiO3)陶瓷的方法，属于无铅陶瓷制备技术领域。按化学式(1‑x)Bi(1+y)FeO3‑xBaTiO3计算称量，球磨混料，烘干，过筛后置于氧化铝坩埚中，在780～950℃下预烧2～12h得到预烧粉；然后进行二次球磨，再于70～120℃烘干，过筛干燥粉中加入2wt％浓度的聚乙烯醇研磨造粒，造粒粉放入模具中压制成型；将陶瓷坯体置于马弗炉中升温至300～440℃，排胶2～4h后，升温至950～1060℃，保温1～10min，降温至900～1060℃，烧结4～12h，随炉冷却至室温，制备所需陶瓷。本发明所述两步烧结法通过巧妙控制两步烧结温度和保温时间，能避开铁酸铋‑钛酸钡陶瓷中杂相生成温度区间，所制备的陶瓷的结晶性良好、成分均匀、晶粒尺寸细小、结构致密、介电损耗减小、绝缘性高、剩余极化强度大、压电性能和光伏性能优异。
Method for preparing bismuth ferrite-barium titanate (BiFeO3-BaTiO3) ceramic through two-step sintering
一种两步烧结制备铁酸铋-钛酸钡(BiFeO3-BaTiO3)陶瓷的方法
ZHANG BOPING (author) / GAO XIAOQI (author) / ZHU BINGZHAO (author) / TANG YUCHENG (author) / YIN YANG (author) / ZHANG RUI (author) / LIU HUAN (author) / SONG AIZHEN (author) / DAI TONGGUANG (author) / PEI JUN (author)
2022-03-15
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
Preparation method of bismuth ferrite-barium titanate (BiFeO3-BaTiO3) piezoelectric ceramic
| European Patent Office | 2020
| European Patent Office | 2023
| European Patent Office | 2023
Preparation method of bismuth ferrite-barium titanate composite piezoelectric ceramic
| European Patent Office | 2020