Alexandre Maitre
University of Limoges, France
Title: Mechanism of Spark Plasma Sintering of High Temperature Ceramics such as carbides
Biography
Biography: Alexandre Maitre
Abstract
Spark Plasma Sintering (SPS) has proved is efficiency on the sintering on various materials which were known to be difficult to sinter without additives. In this presentation, the investigation of some thermomechanical properties will be illustrated on two different carbides Zirconium carbide and boron carbide. Zirconium Carbide is interesting for high temperature application. Zirconium carbide (ZrCx) and oxycarbide (ZrCxOy) carbide was synthetized by carboreduction of zirconia and carbon and was then sintered by SPS. A complete study including composition, particles size evolution was done. The kinetics of spark plasma sintered ceramics has been investigated. A change of densification mechanism appears during the intermediate and final sintering stages. During this last stage, the deformation mechanism is similar to the one involved during creep of dense ceramics. The comparison of densification and creep strain rates seems to show that no specific effects strongly enhance strain rate during the final densification stage of Spark Plasma Sintering. Boron carbide is a promising material for moderator in nuclear industry. The influence of preparation before SPS was studied: a liquid way was studied and compared. Different solvent were tested and green bodies were obtained. During this sintering, different chemical reactions were observed: oxides present in the native powder react and the composition of the carbide evolves. In a second step, thermomechanical properties were determined
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Recent Publications :
- Belon R., Antou G., Pradeilles N., Maître A., Gosset D., Mechanical behaviour at high temperature of spark plasma sintered boron carbide ceramics, Ceramics International, 43 (8) (2017) 6631-6635.
- Antou G., Pradeilles N., Gendre M., Maître A., New approach of the evolution of densification mechanisms during Spark Plasma Sintering: Application to zirconium (oxy-)carbide ceramics, Scripta Materialia, 101 (2015) 103-106.
- Réjasse F., Trolliard G., Rapaud O., Maître A., David J. TEM study of the reaction mechanisms involved in the carbothermal reduction of hafnia, RSC Advances, 5 (56) (2015) 45341-45350.
- Lee W.E., Giorgi E., Harrison R., Maître A., Rapaud O., Nuclear Applications for Ultra-High Temperature Ceramics and MAX Phases (Book Chapter), Ultra-High Temperature Ceramics: Materials for Extreme Environment Applications, 2014, pp. 391-415.
- David, J., Trolliard, G., Gendre, M., Maître, A., TEM study of the reaction mechanisms involved in the carbothermal reduction of zirconia, Journal of the European Ceramic Society, 33 (1) (2013) 165-179.