摘要
为了研究烧结法合成钛酸钾晶须的机理,利用X射线衍射仪和扫描电镜分析其相变和显微形貌。实验发现:在约950℃,四钛酸钾(K2Ti4O9)开始出现亚稳转变,1100℃以上保温2h后,其临界转变基本完成,说明K2Ti4O9是高温亚稳相,低于临界反应温度合成的六钛酸钾(K2Ti6O13)是由K2Ti4O9的亚稳相转变获得的。利用K2Ti4O9的高温亚稳性可以降低烧结法合成K2Ti6O13晶须的合成温度,对于确定烧结工艺参数具有重要意义。
In order to study the mechanism of potassium hexatitanate （K2Ti6O13） synthesized by the calcination method, the phase transformation and micrographs were studied using X-ray diffractometer and scanning electron microscope. The test results indicate that meta-stable transformation of potassium tetratitanate begins at 950 ℃ or so, then finishes completely at higher than 1 100 ℃ and maintained for 2 h. Potassium tetratitanate （K2Ti4O9） is one kind of high temperature meta-stable phase. Potassium hexatitanate synthesized at lower than critical transformation temperature is obtained from meta-stable transformation of potassium tetratitanate. It is necessary to be able to lower the synthesizing temperature by application of high temperature meta-stability of potassium tetratitanate. It is also important to ascertain techniques for synthesizing potassium titanate.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第6期829-831,837,共4页
Journal of The Chinese Ceramic Society
基金
天津市自然科学基金重点(00380181)资助项目
关键词
四钛酸钾
六钛酸钾
高温亚稳性
烧结法
potassium tetratitanate
potassium hexatitanate
high temperature meta-stability
calcination method
