Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Lanthanum chromate ceramic and preparation method thereof
The invention belongs to the technical field of ceramics. The invention provides lanthanum chromate ceramic and a preparation method thereof. Lanthanum oxide, chromic oxide and absolute ethyl alcohol are subjected to ball milling, and ball-milled slurry is obtained; sequentially carrying out pre-forming, forming and roasting on the ball-milled slurry and polyvinyl butyral to obtain a ceramic biscuit; and heating the ceramic biscuit to a first temperature, applying a direct-current electric field, continuously heating to a second temperature for flash sintering, and preserving heat and sintering at the second temperature to obtain the lanthanum chromate ceramic. The lanthanum chromate ceramic prepared through low-temperature reaction flash sintering has a good microstructure, high density, uniform size and small average particle size, the preparation method can enable the phase transformation and densification process from oxide to perovskite to be completed instantly within several seconds, the flash sintering temperature is low, excessive growth of crystal grains can be inhibited, and the performance of the lanthanum chromate ceramic is improved. The aim of preparing the lanthanum chromate ceramic from the oxide raw material at a low temperature in a short time is achieved, the synthesis process is simplified, and the preparation energy consumption is reduced.
本发明属于陶瓷技术领域。本发明提供了一种铬酸镧陶瓷及其制备方法。将氧化镧、氧化铬和无水乙醇进行球磨，得到球磨浆料；将球磨浆料与聚乙烯醇缩丁醛顺次进行预成型、成型和焙烧，得到陶瓷素坯；将陶瓷素坯加热至第一温度后施加直流电场，继续加热至第二温度发生闪烧，在第二温度下保温烧结，得到铬酸镧陶瓷。本发明通过低温反应闪烧制得的铬酸镧陶瓷，具有良好的微观结构，致密度高，尺寸均匀，平均粒径小，且该制备方法可使氧化物到钙钛矿的相转变及致密化过程在几秒内瞬间完成，闪烧温度低，能够抑制晶粒的过分长大，实现了由氧化物原料在低温短时间内制备出铬酸镧陶瓷的目标，简化了合成工序，降低了制备能耗。
Lanthanum chromate ceramic and preparation method thereof
The invention belongs to the technical field of ceramics. The invention provides lanthanum chromate ceramic and a preparation method thereof. Lanthanum oxide, chromic oxide and absolute ethyl alcohol are subjected to ball milling, and ball-milled slurry is obtained; sequentially carrying out pre-forming, forming and roasting on the ball-milled slurry and polyvinyl butyral to obtain a ceramic biscuit; and heating the ceramic biscuit to a first temperature, applying a direct-current electric field, continuously heating to a second temperature for flash sintering, and preserving heat and sintering at the second temperature to obtain the lanthanum chromate ceramic. The lanthanum chromate ceramic prepared through low-temperature reaction flash sintering has a good microstructure, high density, uniform size and small average particle size, the preparation method can enable the phase transformation and densification process from oxide to perovskite to be completed instantly within several seconds, the flash sintering temperature is low, excessive growth of crystal grains can be inhibited, and the performance of the lanthanum chromate ceramic is improved. The aim of preparing the lanthanum chromate ceramic from the oxide raw material at a low temperature in a short time is achieved, the synthesis process is simplified, and the preparation energy consumption is reduced.
本发明属于陶瓷技术领域。本发明提供了一种铬酸镧陶瓷及其制备方法。将氧化镧、氧化铬和无水乙醇进行球磨，得到球磨浆料；将球磨浆料与聚乙烯醇缩丁醛顺次进行预成型、成型和焙烧，得到陶瓷素坯；将陶瓷素坯加热至第一温度后施加直流电场，继续加热至第二温度发生闪烧，在第二温度下保温烧结，得到铬酸镧陶瓷。本发明通过低温反应闪烧制得的铬酸镧陶瓷，具有良好的微观结构，致密度高，尺寸均匀，平均粒径小，且该制备方法可使氧化物到钙钛矿的相转变及致密化过程在几秒内瞬间完成，闪烧温度低，能够抑制晶粒的过分长大，实现了由氧化物原料在低温短时间内制备出铬酸镧陶瓷的目标，简化了合成工序，降低了制备能耗。
Lanthanum chromate ceramic and preparation method thereof
一种铬酸镧陶瓷及其制备方法
LI MING (Autor:in) / GUAN LILI (Autor:in) / SONG XIWEN (Autor:in) / HUANG YARONG (Autor:in) / WANG HUITAO (Autor:in) / FENG HONGYU (Autor:in) / ZHAO JIAMING (Autor:in) / SHEN PENGCHONG (Autor:in)
14.03.2023
Patent
Elektronische Ressource
Chinesisch
IPC:
C04B
Kalk
,
LIME
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