[T3] Modeling and Sintering

[15A-T3-03] Experimental Analysis of Compression Deformation at High-Temperatures and Numerical Simulation for BaTiO₃ Sintered Compacts

*H. Tanaka¹, H. Matsubara², H. Yokota¹, T. Iguchi¹, Y. Takagi¹, H. Nomura³, S. Terasaka³, D. Igimi³ (1.TDK Corporation, Japan, 2.Tohoku University, Japan, 3.Japan Fine Ceramics Center, Japan)

Keywords:Barium titanate, sintering, yield stress, coefficient of flow stress, simulation

In this study, basic equations (yield stress equation, flow rules) and physical properties of barium titanate (BaTiO₃) are experimentally obtained. These equations and physical properties are introduced to finite element method and sintering behavior of BaTiO₃ bulk is simulated. From the uni-axis compression test, yield stress equation of BaTiO₃ is expressed by Shima’s equation and flow rule is written by plastic equation. The coefficient of flow stress of BaTiO₃ is significantly smaller than literature Alumina and the value depends on grain size. By using these, the experimental sintering deformation is quantitatively reproduced by numerical simulation. In addition, the coefficient of flow stress could be determined by sensitivity analysis, where the flow stress is analyzed as simulation parameter. Through this study, experimentally obtained basic equations and physical properties are numerically validated.