题目：Additive Manufacturing of Ceramics using Preceramic Polymers
报告人：Paolo Colombo教授，Dipartimento di Ingegneria Industriale University of Padova
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. The resulting materials can have useful structural and functional properties.
This talk will discuss the fabrication of (mainly) 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 (FDM); b) direct printing using an ink extrusion printer (DIW); c) indirect printing using a powder bed-based printer (BJ); d) indirect printing using a stereolithographic printer (DLP); e) indirect printing with sub-micron resolution using 2 Photon Polymerization fabrication (TPP).
Furthermore, we developed a novel hybrid approach to fabricate SiOC ceramic structures with feature sizes ranging from sub-micron to millimeter size, by combining 3D macro-stereolithography (DLP) with 2-Photon-Polymerization (TPP).
Finally, we are currently using silicone elastomers to fabricate simple shapes that can be further processed into complex architecture by post-printing folding and pyrolysis.
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.
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 and a diploma in Glass Engineering in 1988. 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 and a member of the EPSRC Peer Review College (UK). He was a Fulbright Visiting Scholar at the Pennsylvania State University in 1991, 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), Fellow of the European Ceramic Society (2017). He was awarded a Fulbright Scholarship 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 published more than 250 papers in peer-reviewed journals (h index WOS: 44; h index Google Scholar: 56), 9 book chapters and holds 10 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 journals (Journal of the American Ceramic Society, Materials Letters, Ceramics International, Journal of Porous Materials, Journal of Materials Research, Journal of Asian Ceramic Societies, Advances in Applied Ceramics: Structural, Functional and Bioceramics, Journal of Ceramic Science and Technology, Materials) and will soon be Editor-in-Chief for the new JECS open access journal (Elsevier).
He has co-organized several international conferences (>100), has given numerous invited talks in the field of porous ceramics, polymer-derived-ceramics and additive manufacturing of ceramics (>50), and has been the guest editor for special issues devoted to those topics (6). He was chair 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. His laboratory runs 8 different AM printers, enabling 3D manufacturing of ceramics from the sub-micron scale to the meter scale.