SEMINAR

The State Key Lab of
High Performance Ceramics and Superfine Microstructure
Shanghai Institute of Ceramics, Chinese Academy of Sciences
 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室



Densification, Microstructure, and Mechanical Properties of Zirconium Diboride Based Ultra-High Temperature Ceramics

Speaker

Sumin Zhu (朱苏敏) 
Missouri University of Science and Technology


 时间： 05 月 21 日 （星期三）上午 9:30
地点：    2 号楼 607  （会议室）


欢迎广大科研人员和研究生参与讨论！

报告内容：

Abstract

Zirconium diboride (ZrB₂) based ultra-high temperature ceramics (UHTCs) are attractive for high temperature engineering applications because of their unique combination of ultra-high melting point (>3000°C), physical and mechanical properties, and chemical stability.  However, despite the attractive properties and potential applications, processing costs and densification remain challenges for the fabrication of ZrB₂-based UHTC components.  Due to its strong covalent bonding and the presence of surface oxide impurities, sintering of ZrB₂ based compositions is difficult.  In the present work, efforts have been made to fabricate ZrB₂ based UHTCs using innovative processing routes in order to enhance densification to near-net-shape, control microstructure, and improve mechanical properties.  Mechanical properties, including Vickers hardness, Young’s modulus, four-point bend strength, and fracture toughness, are measured.  Further, oxidation behavior of dense ZrB₂ based UHTCs is characterized after exposing the specimens to the highly-dissociated air plasma stream.  The work in progress includes grain boundary analysis and optimization of the processing parameters to improve high temperature mechanical properties.

In addition to the research work on UHTCs, ceramic engineering Ph.D. education in the United States will be introduced and compared with the graduate education at SICCAS.

Biographical Information

Sumin Zhu is currently a Ph.D. candidate in ceramic engineering at the Missouri University of Science and Technology (formerly University of Missouri-Rolla).  Zhu received his B.S. degree in ceramic engineering in 2002 from Nanjing University of Technology, and M.S. degree in materials science and engineering in 2005 from Shanghai Institute of Ceramics, Chinese Academy of Sciences.  In 2007, he had an internship at Hitachi America Ltd..  He has been an author or co-author of >20 papers, 2 industry reports, and one patent.  His papers have received ~100 citations.  He also serves as an invited reviewer for 8 journals and conferences and an editor of the NIST-ACerS phase equilibria diagrams program.  He has made 12 presentations at international conferences as well as an invited seminar at 3M’s world headquarter.