Título: Flash Sintering of Ceramics
Conferenciante: Prof. Rishi Raj. University of Colorado Boulder
Fecha: lunes, 18 de marzo de 2019
Horario: 12:00 h
Lugar: Salón de Grados cicCartuja2
Flash sintering is a novel densification technology for ceramics, which allows a dramatic reduction of processing time and temperature. It represents a promising sintering route to reduce economic, energetic and environmental costs associated to firing. Moreover, it allows to develop peculiar and out-of-equilibrium microstructures.
The flash process is complex and unusual, including different simultaneous physical and chemical phenomena and their understanding, explanation and implementation require an interdisciplinary approach from physics, to chemistry and engineering. In spite of the intensive work of several researchers, there is still a wide debate as for the predominant mechanisms responsible for flash sintering process.
This talk will include an overview of the original research that led to the discovery of the technique by Prof. Raj, as well as an analysis of the most significant mechanisms proposed for explaining the “flash” event. It will also include future scientific activities and potential technological implementations.
Biografía
Prof. Rishi Raj pursued his Ph.D. in 1965 at Harvard. He graduated in 1970 with a Ph. D. in Engineering and Applied Sciences, under the tutelage of Mike Ashby and David Turnbull. After graduating he worked from 1971-1972 as a Staff Scientist at Chase Brass and Copper Company in Cleveland, OH. He returned to Academia in 1972 when he became an Assistant Professor of Mechanical Engineering, University of Colorado at Boulder, CO (1972-1975). In 1975, Raj accepted a position as Professor of Materials Science and Engineering at Cornell University, Ithaca, NY. He worked at Cornell for 21 years from 1975-1996. In 1996, he moved back to Boulder and is currently employed as Professor of Mechanical Engineering, University of Colorado at Boulder, CO.
Prof. Raj has studied oxides and non-oxides to understand a wide range of behavior phenomena, including high-temperature creep, superplasticity, interfaces and amorphous phases and their role in sintering and creep, sintering mechanisms, and polymer-derived amorphous materials. Most recently, he has turned his attention to understanding electric field effects on sintering and defect chemistry, also called “flash sintering.”
Through his career, he has published more than 450 peer reviewed articles in refereed International Journals, with over 20,000 citations of his work on Google Scholar.
He has been named a 2015 Distinguished Life Member by The American Ceramic Society, the highest honor accorded to members of the scientific and technical organization—recognizes an individual’s eminent contribution to the ceramic and glass profession.
El investigador participó en esta actividad con una charla sobre nanomateriales ópticos y su integración en dispositivos lumínicos
La singularidad de sus equipos, en concreto del espectrómetro de RMN de alto campo, ha permitido su inclusión en la Red
Varias de sus patentes mejoran la eficiencia de luminarias y están siendo explotadas por una gran multinacional
Por su capacidad para aunar la ciencia básica de gran calidad e impacto con la transferencia tecnológica de alto nivel.
Será responsable de un nuevo grupo que desarrollará catalizadores diferentes a los empleados actualmente en la industria
Participarán investigadores de Cabimer o la Estación Biológica de Doñana, entre otros centros del CSIC.
Calvo revisa el campo de las perovskitas ABX3 en el especial del Journal of Materials Chemistry A de la Royal Society of Chemistry