Karl Delbé
University of Toulouse
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Publication
Featured researches published by Karl Delbé.
Key Engineering Materials | 2012
Karl Delbé; Solisabel Orozco Gomez; Juan Manuel Carrillo Mancuso; Jean Yves Paris; Jean Denape
Extreme working conditions affect material used as friction components in transportation field: they rapidly reach their limits and critical parts require to be regularly replaced. Alternative solutions withstanding higher operating conditions imply to find innovative materials. Stellite matrix composites including various solid lubricants, WS2 and h-BN, able to admitextreme conditions were developed using a Spark Plasma Sintering technique, which makes possible the formation of new microstructures out of reach by conventional means. Sliding tests were conducted using a pin-on-disc tribometer in air at 450°C, with a velocity of 0,25 m/s and various normal load ranged from 2.5 to 40 N. Influence of solid lubricant content and sensitivity to test parameters were studied in terms of friction and wear responses of the contacting materials. Friction properties are equivalent to Stellite ones and sometimes lesseffective. A reduction of wear is quantified for many composites, and the best behavior is observed for those that contain WS2. In agreement with the third body approach, interpretations are proposed to describe the interphase dynamics within the contact.
Key Engineering Materials | 2011
Solisabel Orozco Gomez; Karl Delbé; Alberto Benitez; Jean Yves Paris; Jean Denape
Materials used as friction components in transportation field are subjected to extreme working conditions: they rapidly reach their structural limits and critical parts require to be regularly replaced. Alternative solutions withstanding higher operating conditions imply to find innovative materials. Steel matrix composites including various solid lubricants, WS2 and h-BN, able to support high temperatures were developed using a Spark Plasma Sintering technique, which makes possible the formation of new microstructures out of reach by conventional means. Sliding tests were conducted using a pin-on-disc tribometer in air at 450°C, with a normal load of 15 N and various velocities ranged from 0.1 to 1.5 m/s. Influence of solid lubricant content and sensitivity to test parameters were studied in terms of friction and wear responses of the contacting materials. Test results reveal an improvement of friction properties for composites containing highest WS2contents. A reduction of wear is quantified for all composites, and the best behaviour is observed for those that contain WS2. In agreement with the third body approach, interpretations are proposed to describe the interphase dynamics within the contact.
23rd ABCM International Congress of Mechanical Engineering | 2015
Renato Araujo Barros; Jean Denape; Karl Delbé; Antonio Jorge Abdalla; Humberto Lopes Rodrigues; Renann Pereira Gama
This study evaluated the best parameters for the carburizing treatment using a CO2 laser of low power over an AISI 4340 steel previously subjected to heat treatments of quenching and tempering. The coating process used a liquid dispersion of carbon black in ethanol and carboxyl methylcellulose. The laser power was kept constant at 125 W and the resolution is 600 dots per inch. The variable parameter of CO2 laser was the speed. Two speeds were selected for the coating preparation: 1200 and 2000 m/s. After treatment, metallographic preparation and optical microscopy observation were performed in addition to the evaluation of parameter variations through hardness measurements and microscratch tests.
Journal of The European Ceramic Society | 2015
Stéphanie Lafon-Placette; Karl Delbé; Jean Denape; Marc Ferrato
International Journal of Rock Mechanics and Mining Sciences | 2016
Malik Yahiaoui; Jean-Yves Paris; Karl Delbé; Jean Denape; Laurent Gerbaud; Alfazazi Dourfaye
International Journal of Refractory Metals & Hard Materials | 2016
Malik Yahiaoui; Jean-Yves Paris; Karl Delbé; Jean Denape; Laurent Gerbaud; Christophe Colin; Olivier Ther; Alfazazi Dourfaye
Archive | 2015
Moussa Karama; Karl Delbé; Jean Denape
Archive | 2015
Karl Delbé; Stéphanie Lafon-Placette; Jean Denape; Marc Ferrato
Matériaux 2014 | 2014
Karl Delbé; Stéphanie Lafon-Placette; Jean Denape; Marc Ferrato
Matériaux 2014 | 2014
Karl Delbé; Stéphanie Lafon-Placette; Jean Denape; Marc Ferrato