LI Yueming , ZHANG Xiaona , LIU Hu , LIAO Runhua , WANG Zhumei , SHEN Zongyang

(School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Key Laboratory of Advanced Ceramics of Jiangxi Province, Jingdezhen Jiangxi 333403, China)

Abstract: K_0.5Na_0.5NbO₃ powder was synthesized by solid state reaction method using Na₂CO₃, K₂CO₃ and Nb₂O₅ as raw materials. The K_0.5Na_0.5NbO₃ powder mixed with appropriate dispersant, agglomerant and defoaming agent was used to make the slurry for tape-casting. The effect of solid content, the amount and type of such organic additives as dispersant, agglomerant and defoaming agent on the properties of the slurry and the K_0.5Na_0.5NbO₃ ceramics were investigated. The results show that when the thickness of the cast diaphragm is 0.3mm, the dispersant is 2% triethanolamine, and the content of powder is 55wt%, the viscosity is 2000 mPa·s, optimal for tape-casting. The strength of ceramic films is high with 8% PVB as agglomerant.

Keywords: sodium potassium niobate, lead-free piezoelectric ceramics, tape-casting