清华大学材料科学与工程研究院《材料科学论坛》学术报告
报告时间：2026年8月25日上午10:30
报告人：Ahmad Sayyadishahraki博士（伊朗伊斯法罕理工大学）
报告地点：清华大学逸夫技术科学楼A205学术报告厅
邀请人：王轲老师
报告题目：Ultrafast Photonic Sintering and Dislocation Engineering in Functional Oxide Ceramics
报告摘要：
Advanced sintering techniques provide new opportunities for tailoring the microstructure and functional properties of oxide ceramics. This seminar presents recent research on ultrafast photonic sintering of ZnO varistor ceramics and discusses the role of processing-induced defect structures, particularly dislocations generated during rapid Spark Plasma Sintering (SPS).
In the first part, a novel photonic-assisted sintering approach is introduced. Compared with conventional sintering, this method enables extremely rapid heating and densification while significantly suppressing grain growth. The resulting fine-grained ZnO ceramics exhibit enhanced nonlinear electrical performance, demonstrating the potential of photonic-assisted processing for the energy-efficient fabrication of functional ceramics.
The second part focuses on dislocation engineering in rapidly sintered BaTiO3 ceramics. The formation of dislocation-rich microstructures during SPS is discussed in relation to electrical conductivity, dielectric response, and polarization behavior. Particular attention is given to how non-equilibrium defect structures can influence charge transport and polarization phenomena in oxide ceramics.
This seminar highlights advanced sintering as a versatile tool for microstructure and defect engineering, offering new strategies for the design of high-performance electronic, dielectric, and energy-related ceramic materials.
报告人简介：
Dr. Ahmad Sayyadishahraki is an Assistant Professor of Materials Engineering at Isfahan University of Technology (IUT), Iran. He received his Ph.D. in Ceramic Materials from Tarbiat Modares University in 2017. He was a Research Scholar at Arizona State University (2016–2017) and later an Alexander von Humboldt Research Fellow at TU Darmstadt, Germany (2021–2024).
His research interests include advanced sintering, defect engineering, microwave dielectric materials, varistor ceramics, and electrical transport phenomena in functional oxide ceramics, with a particular focus on the relationship between processing, microstructure, defects, and functional properties in electronic and energy-related ceramic materials.