清华大学材料科学与工程研究院《材料科学论坛》

学术报告

报告题目： Additive Manufacturing of Ceramics using Inorganic Polymers

报告人：   Prof. Paolo Colombo（Dipartimento di Ingegneria Industriale, University of Padova, and Adjunct Professor, Department of Materials Science and Engineering, The Pennsylvania State University,University Park）

报告时间：  2018年9月26日（周三），下午3:30

报告地点：  清华大学逸夫科学技术楼A205学术报告厅

联系人：    潘伟老师（62772858）

报告摘要：
Preceramic polymers are precursors for ceramic phases of different composition. They convert into nano-structured ceramic materials in the system Si(X)OCN (with X = Al, Ti, Zr, etc.), also called PDCs or Polymer-Derived-Ceramics, by high temperature pyrolysis.
This talk will discuss the fabrication of porous structures starting from pure preceramic polymers (e.g. silicone resins) or silicone resins plus reactive fillers to produce advanced silicate ceramic phases, including bioceramics and Ceramic Matrix Composites, suitable for different potential applications.
Different types of additive 3D manufacturing techniques were employed, including: a) direct printing using a fused deposition printer; b) direct printing using a paste extrusion printer (Direct Ink writing);      c)  indirect printing using a powder bed-based printer (in collaboration with researchers from BAM, Berlin, Germany); d) indirect printing using a stereolithographic printer; e) indirect printing with sub-micron resolution using 2 Photon Polymerization fabrication. Advantages and disadvantages of the different processing techniques employed, in relation to the use of preceramic polymers, will be discussed, and examples of produced and characterized porous structures for potential use in different applications will be presented.
Geopolymers are based on an inorganic 3D network of alumino-silicate units, usually synthesized through reaction of alumino-silicate powders in presence of a silicate alkaline solution. The rheological characteristics of the reactive mixtures and the fact that these systems can consolidate at low or even room temperature, together with their intrinsic micro- and meso-porosity, mechanical properties and chemical durability, are the reasons why they are considered for a wide range of applications, such as construction materials, thermal insulation, filters, adsorbers and so on.
Our group has been exploring innovative fabrication processes for geopolymer components, focusing on both direct and indirect additive manufacturing technologies. We used, for the first time, mixtures based on a geopolymeric binder for 3D printing of components for different applications. A challenge, when using geopolymers, is the fact that the mixture is reactive, as the geopolymerization reactions proceed with time, and therefore the rheology of the system changes with time. Therefore, the process is actually a 4D printing process, rather than a 3D one. The printed components can be used at room temperature or at high temperature, as they can easily withstand heating up to at least 1200°C.
Indirect powder-based additive manufacturing was carried out in collaboration with a company (Desamanera, Italy), and a binder mixture of suitable reactivity and rheology was sprayed on a bed of marble powder, resulting in large scale parts (that can be up to 6x6x6 m3) with improved mechanical properties compared to the ones printed using non-hydraulic binders. For direct ink writing, geopolymer pastes with optimized pseudo-plastic with yield stress behavior were developed and used for the fabrication of highly porous 3D lattices for filtration applications.
 
报告人简介：
Paolo Colombo is a professor of Materials Science and Technology at the Department of Industrial Engineering, University of Padova, Padova, Italy. He graduated from the University of Padova with a degree in chemical engineering in 1985. He was an assistant professor at the University of Padova from 1990 to 1998 and then an associate professor at the University of Bologna, until 2005.
He is also an adjunct professor of Materials Science and Engineering at the Pennsylvania State University, a visiting professor in the Department of Mechanical Engineering of University College London, UK, a member of the World Academy of Ceramics, a member of the European Academy of Sciences and a member of the EPSRC Peer Review College (UK). He was a Foreign Scientist at INSA, Lyon, France in 2015, and a DGF Mercator Professor at the Technical University Bergakademie Freiberg, Germany in 2016. He was elected Academician of the World Academy of Ceramics (2006), Academician of the European Academy of Sciences (2016), Fellow of the American Ceramic Society (2010), Fellow of the Institute of Materials, Minerals and Mining (2011) and Fellow of the European Ceramic Society (2017).
He was awarded a Fulbright Scholarship for the Pennsylvania State University in 1991, the Pfeil Award (The Institute of Materials, Minerals and Mining, London, UK) in 2007, the Global Star Award (The Engineering Ceramics Division of the American Ceramic Society) in 2010, the Edward C. Henry Award (The Electronics Division of The American Ceramic Society) in 2011, the Verulam Medal & Prize (The Institute of Materials, Minerals and Mining, London, UK) in 2013 and the Global Ambassador Award (The American Ceramic Society) in 2016. He was Principal Investigator for PRIN, Vigoni, Galileo projects and has been involved in European Projects (FP6, FP7, Horizon 2020). He was Principal Investigator for several research contracts with national and international companies.
He published more than 230 papers in peer-reviewed journals, 9 book chapters and holds 12 international patents. He is co-editor of a book on cellular ceramics, a book on polymer-derived-ceramics and 11 proceedings books. He is in the editorial board of 8 international scientific (ISI) journals. 
h index: WOS (accessed on July 28, 2018): 40; Total Number of Citations: 6199; Average Citations per Item: 25.62. h index: Google Scholar (accessed on July 28, 2018): 53 (39 since 2013); Citations: 10618; i10 index: 173 (135 since 2013).
He has co-organized several international conferences (>90), has given numerous invited talks in the field of porous ceramics and polymer-derived-ceramics (>40), and has been the guest editor for special issues devoted to those topics (6). He is the convener of the XVI conference of the European Ceramic Society (Turin, Italy, 16-20/6/2019).
Paolo Colombo’s research interests include novel processing routes to porous glasses and ceramics (currently focusing mainly on Additive Manufacturing, using different technologies), the development of ceramic components from preceramic polymers and geopolymers, and the vitrification and reuse of hazardous industrial and natural waste.