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High-density lithium titanate fine-grain ceramic rapid sintering method based on electric pulse
The invention discloses an electric pulse-based rapid sintering method for high-density lithium titanate fine-grain ceramic, which comprises the following steps: preparing lithium titanate powder by adopting a solid phase method, tabletting the lithium titanate powder to obtain a lithium titanate ceramic green body, placing the lithium titanate ceramic green body between two graphite felts, and rapidly sintering under the action of a high-frequency direct-current pulse power supply to obtain the high-density lithium titanate fine-grain ceramic. The high-density lithium titanate fine-grain ceramic is prepared. According to the method, high-frequency pulse direct current is applied to the two ends of the graphite felt, so that the graphite felt generates joule heat, a lithium titanate ceramic green body clamped between the graphite felt is rapidly sintered and densified, the defects of grain growth and lithium volatilization of lithium ceramics after long-time sintering are overcome, and the lithium titanate ceramic green body can be rapidly sintered and densified by adjusting pulse voltage and time. The density and the grain size of the lithium titanate ceramic can be regulated and controlled; due to high heating rate and short sintering time, the prepared fine-grain high-density lithium titanate ceramic has relatively high compressive strength and bending strength, and the comprehensive mechanical properties of the ceramic in service are ensured to a certain extent.
本发明公开了基于电脉冲的高致密钛酸锂细晶陶瓷快速烧结方法，包括采用固相法制备钛酸锂粉体，将钛酸锂粉体压片得到钛酸锂陶瓷生坯，将钛酸锂陶瓷生坯置于两片石墨毡中间，在高频率直流脉冲电源作用下进行快速烧结，即制得高致密钛酸锂细晶陶瓷。本发明通过在石墨毡两端施加高频率脉冲直流电流，使石墨毡产生焦耳热，从而使夹在石墨毡中间的钛酸锂陶瓷生坯快速烧结致密化，克服锂陶瓷在长时间烧结下的晶粒长大和锂挥发，通过调节脉冲电压和时间，还可以实现对钛酸锂陶瓷致密度和晶粒尺寸的调控；由于升温速率快和烧结时间短，制备的细晶高密度钛酸锂陶瓷具有较高的抗压强度和抗弯强度，一定程度上保证了其服役时候的综合力学性能。
High-density lithium titanate fine-grain ceramic rapid sintering method based on electric pulse
The invention discloses an electric pulse-based rapid sintering method for high-density lithium titanate fine-grain ceramic, which comprises the following steps: preparing lithium titanate powder by adopting a solid phase method, tabletting the lithium titanate powder to obtain a lithium titanate ceramic green body, placing the lithium titanate ceramic green body between two graphite felts, and rapidly sintering under the action of a high-frequency direct-current pulse power supply to obtain the high-density lithium titanate fine-grain ceramic. The high-density lithium titanate fine-grain ceramic is prepared. According to the method, high-frequency pulse direct current is applied to the two ends of the graphite felt, so that the graphite felt generates joule heat, a lithium titanate ceramic green body clamped between the graphite felt is rapidly sintered and densified, the defects of grain growth and lithium volatilization of lithium ceramics after long-time sintering are overcome, and the lithium titanate ceramic green body can be rapidly sintered and densified by adjusting pulse voltage and time. The density and the grain size of the lithium titanate ceramic can be regulated and controlled; due to high heating rate and short sintering time, the prepared fine-grain high-density lithium titanate ceramic has relatively high compressive strength and bending strength, and the comprehensive mechanical properties of the ceramic in service are ensured to a certain extent.
本发明公开了基于电脉冲的高致密钛酸锂细晶陶瓷快速烧结方法，包括采用固相法制备钛酸锂粉体，将钛酸锂粉体压片得到钛酸锂陶瓷生坯，将钛酸锂陶瓷生坯置于两片石墨毡中间，在高频率直流脉冲电源作用下进行快速烧结，即制得高致密钛酸锂细晶陶瓷。本发明通过在石墨毡两端施加高频率脉冲直流电流，使石墨毡产生焦耳热，从而使夹在石墨毡中间的钛酸锂陶瓷生坯快速烧结致密化，克服锂陶瓷在长时间烧结下的晶粒长大和锂挥发，通过调节脉冲电压和时间，还可以实现对钛酸锂陶瓷致密度和晶粒尺寸的调控；由于升温速率快和烧结时间短，制备的细晶高密度钛酸锂陶瓷具有较高的抗压强度和抗弯强度，一定程度上保证了其服役时候的综合力学性能。
High-density lithium titanate fine-grain ceramic rapid sintering method based on electric pulse
基于电脉冲的高致密钛酸锂细晶陶瓷快速烧结方法
GONG YICHAO (author) / WANG YUEFEI (author) / LI JIARUI (author) / ZHANG GUOJUN (author) / YAN GUOJUN (author)
2024-03-26
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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