Influence of Hydrothermal Conditions on Size of Template Particles for Textured Ceramics

摘要

We report the influences of the sodium dodecyl-benzenesulfonate (SDBS), hydrothermal reaction temperature and time on the size of potassium sodium niobate (K,Na)NbO-3 (KNN) template particles to determine the regularities of these changes. In the reaction with a small autoclave, when the quantity of SDBS reached 1.5wt%, the width of the obtained platelike KNN-hydrate particles reached a maximum of 1.5μm and the thickness was 0.15μm, meaning that the aspect ratio was 10/1. To accommodate practical applications, a large autoclave was used in the following hydrothermal reaction. We found that the size of the platelike particles increased with improved reaction temperature and time. Particles 1.5 to 5μm wide and 0.15 to 0.4μm thick were prepared. After calcining these particles at 450℃, platelike KNN template particles were obtained. Finally, tape-casting results showed that the platelike KNN templates have the (100) orientation.