应我所贾德昌教授邀请，在哈工大先进陶瓷复合材料与涂层创新引智基地（111引智基地）的资助下，世界陶瓷科学院院士、欧洲科学院院士、帕多瓦大学Paolo Colombo教授将于2018年9月23日-25日来我校访问，并将做有关无机聚合物增材制造和高孔隙矿聚物制备精彩学术报告，欢迎广大师生参加。
报告题目（一）：Additive Manufacturing of Ceramics using Inorganic Polymers
报告地点：哈工大科学园C3栋特陶所4楼学术报告厅（417房间）
报告时间：2018年9月24日上午9：00
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. For example, a novel approach to fabricate SiOC ceramic structures with a wide range of feature sizes by additive manufacturing has been developed by combining the 3D macro-stereolithography (STL) to achieve cm-sized sample geometries with the 2-Photon-Polymerization (TPP) to structure the surface with sub-μm features.A commercial available polysiloxane which was previously optimized for both macro-STL and TPP was used to join both additive manufacturing techniques. Porous samples with overall dimensions in the cm-range and μm-sized features were printed and structured with an STL printer. Afterwards the sample was mounted in a TPP printer and the surface was additionally structured to achieve surface textures in the sub-μm range. After pyrolysis a uniform, homogenous shrinkage of the overall sample was observed yielding a dense, crack-free SiOC ceramic structured across several length scales. In this way the limitation of 3D-STL printers can be overcome realizing structures well below the resolution limit (typically around 50 μm). Moreover, ceramic patterns in the sub-μm scale can be realized on a handleable macro-sample of the same ceramic composition, freeing TPP structures of the until now unavoidable glass-substrates employed in TPP printing.
报告题目（二）：High-porosity geopolymer components by direct foaming and direct ink writing
报告地点：哈工大科学园C3栋特陶所4楼学术报告厅（417房间）
报告时间：2018年9月25日上午8：30
报告摘要
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.
High-porosity metakaolin-based geopolymer foams were fabricated by a direct foaming technique using various approaches. Slurries processed in optimized conditions enabled to fabricate potassium based geopolymer foams with a total porosity in the range of ~60 to ~90 vol% (~55 to ~85 vol% open), thermal conductivity from ~0.289 to ~ 0.091 W/mK, and possessing a compressive strength from ~0.3 to ~9.4 MPa. The addition of vegetable oil allowed for the in situ generation of surfactant molecules, leading to high levels of open, interconnected porosity and increase specific surface area.
My research group has also been exploring the use of additive manufacturing technologies with geopolymers, in particular to fabricate components with non-stochastic porosity. We produced produced geopolymer formulations that could be printed using Direct Ink writing for the manufacturing of components for different applications. Geopolymer inks with optimized pseudo-plastic with yield stress behavior were developed by controlling the composition, rheology and additives in the formulation as well as taking advantage of the time during which the viscosity of the system was rather constant. Different fillers (powder or fiber) were added to further modify the properties of the produced samples. 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.
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 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 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 is also an adjunct professor of Materials Science and Engineering at the Pennsylvania State University. 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 awarded 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.
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. 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.
Selective publications
1) C. Vakifahmetoglu, D. Zeydanli, P. Colombo, “Porous polymer derived ceramics,” Mat. Sci. Eng. R, 106 (2016) 1-30
2) A. Zocca, P. Colombo, C.M. Gomes, J. Guenster, “Additive Manufacturing of Ceramics: issues, potentialities and opportunities,” J. Am. Ceram. Soc., 98 (2015) 1983–2001.
3) M. Strozi Cilla, M.R. Morelli, P. Colombo, “Open cell geopolymer foams by a novel saponification/peroxide/gelcasting combined route,” J. Europ. Ceram. Soc., 34 (2014) 3133–3137.
4) M. Adam, C. Vakifahmetoglu, P. Colombo, M. Wilhelm, G. Grathwohl, “Polysiloxane-Derived Ceramics Containing Nanowires with Catalytically Active Tips,” J. Am. Ceram. Soc., 97 (2014) 959–966.
5) J. Schmidt, H. Elsayed, E. Bernardo, P. Colombo, “Digital Light Processing of Wollastonite-Diopside Glass-ceramic Complex Structures,” J. Eur. Ceram. Soc., 38 (2018) 4580–4584.
6) J. Schmidt and P. Colombo, “Digital Light Processing of Ceramic Components from Polysiloxanes,” J. Eur. Ceram. Soc., 38 (2018) 57-66.
Paolo Colombo（院士、教授）
e-mail: paolo.colombo@unipd.it