Dr Francis Cambier, Belgian Ceramics Research Centre, Belgium
Professor Anne Leriche, University of Valenciennes and Hainaut-Cambresis, France
Presentation 1 – Can Laser be a Tool for Manufacture of Complex Shaped Ceramics?
Examples of Additive and Subtractive Methods
Presentation 2 – Processing of Macro- and Micro- Porous Ceramics for Bone Substitute Applications
Presentation 1 – Dr Francis Cambier
Near net shape ceramic parts can be economically obtained in the “green” state. When the production of a large number of components is considered, then methods such as injection molding can be used and the tooling costs can be depreciated over a large series of parts. However, before ordering large quantities, customers want to see at least a prototype or a limited series of parts. Such a delivery is often expensive and always takes a long time. For prototypes, or for very small series of parts, two processing methods are generally used: (1) “machining”, operated generally after “pre-sintering”, which starts from isostatically pressed and pre-sintered “blanks” and (2) “additive manufacturing” which consists of the production of accurate parts from a CAD file in a short time with very little need for human input. This talk will discuss the advantages and drawbacks of methods using Laser, both for subtraction of material (from green, pre-sintered and densified states) and for addition of material (using SLS-SLM technology). It will be shown that it is possible to achieve very complex shapes by both methods, the subtractive method, starting from green parts, allowing very precise details to be obtained. Some examples of parts will be shown in comparison with classical milling of pre-sintered blanks. For SLS-SLM, the development target was to obtain molds for investment casting. Tests of formed molds with aluminum alloys and stainless steel have been successful. Finally, recent developments of hybrid methods applied to green blanks (spindle milling + laser machining) will be discussed to show the enormous time gain by comparison with classical techniques.
Presentation 2 – Professor Anne Leriche
This talk will present different shaping methods for fabrication of porous ceramics: (i) the impregnation by ceramic slurries of a polymeric skeleton made of bonded organic PMMA beads (ii) the freeze-drying of ceramic suspensions, and (iii) the 3D-printing of ceramic slurries. The last two techniques lead to columnar porous structure development: the freeze-dried porous material is characterized by elongated and ellipsoidal section pores with sizes of a few tens of microns, while the pores produced in the material by 3D printing have continuous channels of square cross-section and of larger size. The materials prepared by the impregnation technique are macroporous with interconnected spherical pores, the size of which depend on bead diameter and binding process parameters. These methods were applied to the processing of calcium phosphate ceramic scaffolds for bone substitute applications and the different as-obtained pore architectures are compared for osteoblast cell invasion.
ABOUT THE PRESENTERS
Dr Francis Cambier is Director General of the Belgian Ceramic Research Centre (BCRC) in Mons, Belgium (presently about 100 employees) since 1996 having been involved as Research Manager specialising in processing and assessment of thermo-mechanical properties of structural ceramics and refractory materials. He has been lecturing on advanced ceramics, glass structure and powder synthesis at the University of Valenciennes, France during the period 1991-2000 and lecturing advanced ceramics and applications at the School of Engineers of the University of Mons from 2001 to 2014. He is author or coauthor of more than 275 papers, of more than 250 communications and of 8 patents. He has presented many invited talks in Europe, China, Japan and the United States of America. He has been strongly involved in the organisation of research in Belgium, as President of the Walloon Regional Research Centres Association from 2003 to 2015 and is vice-president of the equivalent organisation at the Federal (Belgian) level since 2004. He is also member of the board (or chairman) of several companies or subsidiaries, whose activities are related to the BCRC. Dr Cambier has been a leading member of the Belgian Ceramic Society since 1985, organising several international conferences and particularly the European Ceramic Society (ECerS) Conference and Exhibition in Bruges in 2001. He has also been strongly involved in the ECerS organisation as Permanent Secretariat since 2001, Secretary General of the Society and Secretary of the JECS Trust (foundation of ECerS) since 2007 and ECerS Fellow since 2013. Dr Cambier was elevated to the grade of Officer of the Order of Leopold II in 2005 and became honorary Dean of Work (for the Belgian ceramic and tile industries) in 2008. He received the honorary Medal of the National Fund for Scientific Research (FNRS Belgium) in 2010 and was presented with the "Stuijts Award" of ECerS in 2011 during the Stockholm conference. He was elected to the World Academy of Ceramics in 1999. Dr Cambier is a member of the American Ceramic Society since 1983 and became ACerS Fellow in 2016.
Professor Anne Leriche is Director of the Laboratory of Ceramics and Associated Materials (LMCPA) at the University of Valenciennes and Hainaut-Cambrésis, Maubeuge Campus, France. Prior to taking up her academic appointment at the University, she was a Research Engineer at C.R.I.T.T. “Fine Ceramics”, Maubeuge, France and Head of R&D at Neoceram SA at Strépy Bracquegnies, Belgium, a new SME start-up company involved in the fabrication of oxide advanced ceramics by pressing and slip casting. From 1983 to 1989 she was a researcher at the Belgian Ceramics Research Centre, Mons where she worked on mullite, zirconia based composites and silicon nitride composites reinforced by particles, platelets, fibers and whiskers. She gained her PhD from the University of Mons in 1986. In 1990, Professor Leriche joined the LMCPA where she initiated a new research topic on the study of relationships between microstructural characteristics and properties of ceramics and extended the expertise of the laboratory to oxide powder synthesis through liquid precursor routes. In 1994, she was promoted to Professor and, in 1999, became the Director of the laboratory, leading 30 researchers. Today, the research carried out by the laboratory is mainly focused on bioceramics for bone substitutes, piezoelectric ceramics for actuator applications and ceramic coatings by sol-gel method for thermomechanical applications. Most of the PhD topics in the lab are linked to industrial problems and financially supported by industry or regional/national bursaries. She has more than 150 publications in international journals and has been invited to give talks in Europe, USA and China. Professor Leriche was President of the European Ceramic Society (ECerS), 2013-2015; President of the JECS Trust (ECerS Foundation), 2009-2010 and 2015-2017 and ECerS Fellow since 2013. She was President of the French Ceramic Society, 2006-2016, received the French Education Award Chevalier (knight) “Palmes académiques”. She is author or co-author of several books edited by the French Ceramic Society.
DATE: Friday, 2 December 2016
TIME: Presentation 1 – 10h15
Presentation 2 – 11h15
VENUE: LG-011 Lonsdale Building
TEA/COFFEE WILL BE AVAILABLE AT 11h00
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