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Preparation method of compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material
The invention discloses a preparation method of a compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material, which comprises the following steps of: weighing raw materials according to the molar ratio of BiFeO3 to SrTiO3 of 3: 2, mixing, carrying out ball milling, drying, briquetting, sieving, carrying out cold isostatic pressing to obtain a dog-bone-shaped ceramic ligand, connecting a green body sample with holes at two ends with a direct-current power supply through a platinum wire, and sintering to obtain the compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material. The sample is placed in a tubular furnace to be heated to 510-620 DEG C, heat preservation is conducted for 30 min, then an electric field of 100-300 V/cm is applied, sintering is conducted after a short incubation period, the current density is rapidly increased to the preset value range of 50 mA/mm < 2 >, and sintering is finished after the preset current lasts for 60 s; according to the method, low-temperature sintering of the ceramic is realized by using Joule heat under the action of an electric field, the required sintering time is extremely short, preparation of a nano-sized ceramic material is realized, the microstructure and physical and chemical properties of the material are optimized, and finally, the uniform and compact ceramic material without impurity phases is prepared.
本发明公开了一种致密无杂相铁酸铋‑钛酸锶陶瓷材料的制备方法，按照BiFeO3与SrTiO3物质的量比3:2称取原材料混合之后通过球磨、烘干、压块、过筛、冷等静压得到狗骨状陶瓷配体，两端钻孔的生坯样品通过铂金丝与直流电源相连，试样置于管式炉中被加热至510～620℃，保温30min后再施加100～300V/cm的电场，经过短暂的孕育期后发生烧结，电流密度迅速增大到预设值范围为50mA/mm2，在此预设电流下持续60s后结束烧结；本发明利用电场作用下的焦耳热实现陶瓷的低温烧结，且所需烧结时间极短，实现纳米尺寸陶瓷材料的制备，优化材料的微观形貌和物理化学性能，最终制备出均匀致密化且无杂相的陶瓷材料。
Preparation method of compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material
The invention discloses a preparation method of a compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material, which comprises the following steps of: weighing raw materials according to the molar ratio of BiFeO3 to SrTiO3 of 3: 2, mixing, carrying out ball milling, drying, briquetting, sieving, carrying out cold isostatic pressing to obtain a dog-bone-shaped ceramic ligand, connecting a green body sample with holes at two ends with a direct-current power supply through a platinum wire, and sintering to obtain the compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material. The sample is placed in a tubular furnace to be heated to 510-620 DEG C, heat preservation is conducted for 30 min, then an electric field of 100-300 V/cm is applied, sintering is conducted after a short incubation period, the current density is rapidly increased to the preset value range of 50 mA/mm < 2 >, and sintering is finished after the preset current lasts for 60 s; according to the method, low-temperature sintering of the ceramic is realized by using Joule heat under the action of an electric field, the required sintering time is extremely short, preparation of a nano-sized ceramic material is realized, the microstructure and physical and chemical properties of the material are optimized, and finally, the uniform and compact ceramic material without impurity phases is prepared.
本发明公开了一种致密无杂相铁酸铋‑钛酸锶陶瓷材料的制备方法，按照BiFeO3与SrTiO3物质的量比3:2称取原材料混合之后通过球磨、烘干、压块、过筛、冷等静压得到狗骨状陶瓷配体，两端钻孔的生坯样品通过铂金丝与直流电源相连，试样置于管式炉中被加热至510～620℃，保温30min后再施加100～300V/cm的电场，经过短暂的孕育期后发生烧结，电流密度迅速增大到预设值范围为50mA/mm2，在此预设电流下持续60s后结束烧结；本发明利用电场作用下的焦耳热实现陶瓷的低温烧结，且所需烧结时间极短，实现纳米尺寸陶瓷材料的制备，优化材料的微观形貌和物理化学性能，最终制备出均匀致密化且无杂相的陶瓷材料。
Preparation method of compact impurity-phase-free bismuth ferrite-strontium titanate ceramic material
一种致密无杂相铁酸铋-钛酸锶陶瓷材料的制备方法
PU YONGPING (Autor:in) / ZHANG JINBO (Autor:in) / NING YATING (Autor:in) / ZHANG XIAN (Autor:in) / SHANG YANGCHAO (Autor:in)
25.10.2022
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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