Seminar

The State Key Lab ofHigh Performance Ceramics and Superfine Microstructure

Structural Ceramics Engineering Research Center

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，结构陶瓷工程研究中心

Porous Ceramics from Preceramic Polymers. Past, Present and Future

Speaker:  Prof. ing. Paolo Colombo

Department of Mechanical Engineering, University of Padova, Italy

时间：11 月 12 日（星期五）上午 10:00

地点：2 号楼 607 （会议室）

联系人：江东亮院士

曾宇平研究员，张景贤研究员

Abstract

Porous ceramics and cellular ceramics in particular, possess a unique combination of favorable properties, such as low density, low thermal conductivity, low dielectric constant, high thermal shock resistance, high specific strength and high chemical resistance, which make them good candidates for both structural and functional applications (e.g. thermal insulation, liquid metal filtration, impact absorption, catalyst supports, and lightweight structures). This talk will discuss the use of preceramic polymers which enables the fabrication of porous components with a high volume of porosity ranging from the micro-meso to the macro scales, using a variety of processing approaches. These include direct foaming, the use of sacrificial fillers, and the mixing of preceramic polymers of different characteristics. Furthermore, by using fabrication methods such as electro-spraying, micro-fluidics and emulsification, hollow microbeads particles and porous capsules can be produced. Bodies with a hierarchical porosity (e.g. micro-macro) or with graded porosity can also be obtained. The amount of porosity can be as high as >90 vol%, with pore size in the range from nm to mm, and thus most properties can be varied, rather continuously, in a wide range of values. The introduction of filler powders allows for the synthesis of functional ceramic foams, possessing electrical conductivity or magnetic properties.

Recently, chlorination of polymer-derived-ceramics (PDCs) has led to carbon-based materials with high specific surface area values, high pore volume and outstanding gas storage properties. Moreover, the direct growth of 1D nanostructures (e.g. nano-wires, nano-belts) on the cell wall surfaces of cellular bodies has led to components possessing a hierarchical pore structure, of interest for different applications (particle filtration, catalysis or catalyst support). Among the applications so far tested for PDC foams are shields against hypervelocity impacts (for space applications), substrates for zeolites (for sorption and catalysis applications), thermal barriers (for aerospace applications), metal-reinforced composites (for automotive applications).

报告人简介：

Prof. Paolo Colombo graduated in chemical engineering, with a specialization in materials, from Padova University, Italy. He worked as a research associate at Padova University from 1990 to 1998, and as an associate professor at Bologna University from 1998 to 2005. Since 2005, he is professor of Materials Science and Technology at the University of Padova, Italy. He is also an Adjunct Professor of Materials Science and Engineering at The Pennsylvania State University and a Visiting Professor at the Mechanical Engineering Department of University College London. He was a Fulbright Scholar at Penn State in 1991-92. He is a member of the EPSRC Peer Review College (UK), an Academician of the World Academy of Ceramics and a Fellow of the American Ceramic Society. He has published more than 120 papers in peer-reviewed journals, 5 book chapters and holds three patents. He co-edited the books “Cellular Ceramics: Structure, Manufacturing, Properties and Applications” Wiley-VCH, 2005 and “Polymer Derived Ceramics. From Nano-Structure to Applications.”, DESTech Publications, 2009. He has been Guest Editor of several special issues devoted to porous materials and polymer-derived-ceramics for various journals. He has been lead- or co-organizer of several international conferences in the field of porous ceramics and ceramic materials from preceramic polymers, and has given several invited talks and keynote lectures at various international conferences and research institutions. He was awarded the Pfeil Award 2007 (IOMMM) and the Global Star Award (ACerS). He serves on 8 Editorial Boards of international journals, and is a reviewer for 33 ISI journals. He has been also principal investigator in numerous international, bilateral research projects in the field of ceramic materials. His research interests focus mainly on the synthesis and characterization of porous ceramic materials, in particular produced using preceramic polymers. He has worked on novel processing methods (ion irradiation, microwave heating, laser pyrolysis) and products (thin films, joints, microporous components, foams, microtubes) from preceramic polymers. He is also interested in exploring novel applications and production processes for cellular ceramics, as well as in the inertization of industrial waste in glass matrices.