研究目的
To investigate the flash sintering of Nb-doped BaTiO3 ceramics, focusing on achieving rapid densification at low temperatures and explaining the mechanism through a liquid film model.
研究成果
Flash sintering enables rapid densification of Nb-doped BaTiO3 at lower furnace temperatures with fine grains, driven by Joule heating and liquid film capillary forces; it offers energy efficiency and potential for industrial application, but further research is needed to optimize parameters and understand detailed mechanisms.
研究不足
The calculated temperature is an average and may not reflect local variations; the mechanism relies on assumptions about liquid film formation and capillary forces, which might not fully capture all aspects; potential for grain growth with longer holding times; limited to specific dopant and conditions.
1：Experimental Design and Method Selection:
The study uses flash sintering with a DC electric field to densify Nb-doped BaTiO3 ceramics, based on Joule heating and liquid film formation mechanisms.
2：Sample Selection and Data Sources:
Powders of BaCO3, TiO2, and Nb2O5 were mixed, calcined, and pressed into dog-bone specimens.
3：List of Experimental Equipment and Materials:
DC power source (600 W), tube furnace, platinum wires, zirconia balls for ball-milling, SEM (S4800, Japan), and materials like BaCO3 (
4：9%), TiO2 (9%), Nb2O5 (9%). Experimental Procedures and Operational Workflow:
Specimens were sintered with applied electric fields (e.g., 140 V cm-1) at furnace temperatures up to 1055°C, with current limits set, and held for times like 30 s; density measured by Archimedes method; microstructure observed with SEM after thermal etching and Au coating.
5：Data Analysis Methods:
Temperature rise calculated using black body radiation theory; power density and current monitored; SEM images analyzed for grain size and density.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
