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Limoges, France

Nguyen L.,French National Center for Scientific Research | Maitre A.,French National Center for Scientific Research | Lejeune M.,French National Center for Scientific Research | Dossou-Yovo C.,Ceradrop | And 2 more authors.
Ceramics International | Year: 2013

The low temperature sintering of silica is studied under the influence of sintering aids and nanosized powders using X-Ray Diffractometry (XRD) and high-temperature environmental scanning electron microscopy analyses (HT-ESEM). Two particular aids were chosen to conduct this study, [Bi2O 3-ZnO]eutectic and titania. We report a lowering of the crystallization temperature when the former compound is introduced in the silica while a raise is observed when the latter is used. Moreover, the amorphous silica crystallization into cristobalite inhibits drastically the kinetics of densification of silica-based materials. © 2013 Elsevier Ltd and Techna Group S.r.l. Source


Bienia M.,Limoges National Superior School of Industrial Ceramics | Lejeune M.,Limoges National Superior School of Industrial Ceramics | Chambon M.,Limoges National Superior School of Industrial Ceramics | Baco-Carles V.,University Paul Sabatier | And 3 more authors.
Chemical Engineering Science | Year: 2016

Filament growth and breakup are investigated in the context of ceramic inkjet printing. Several inks were formulated and ejected on a printer dedicated to ceramic materials. They consisted of six colloidal inks, four simple fluids and two graphic inks. For each, stroboscopic snapshots were acquired and the filament shape was extracted and analysed, for different nozzle actuation pulses. The filament length and the thread minimum radius were measured during the ejection process. A scaling of the breakup time with the Rayleigh number was obtained, as well as a general behaviour for the filament growth rate during the ejection process. © 2016 Elsevier Ltd. Source


Rammal R.,University of Limoges | Delhote N.,University of Limoges | Tantot O.,University of Limoges | Verdeyme S.,University of Limoges | And 5 more authors.
European Microwave Week 2013, EuMW 2013 - Conference Proceedings; EuMC 2013: 43rd European Microwave Conference | Year: 2013

In this paper, we report the printing of multilayer- structures mixing silver nanoparticles and low temperature fired ceramics based inks. The conductivity of the silver ink is characterized up to 20GHz and above, and the typical performances of the technology and used dielectric material are given. A metallo- dielectric printed capacitor is finally presented as a first demonstrator. © 2013 European Microwave Association. Source


Rammal R.,University of Limoges | Delhote N.,University of Limoges | Tantot O.,University of Limoges | Verdeyme S.,University of Limoges | And 6 more authors.
Mediterranean Microwave Symposium | Year: 2013

In this paper, we report the printing of multilayered structures mixing silver nanoparticles and low temperature fired ceramics based inks. The conductivity of the silver ink is characterized up to 20GHz and above, and the typical performances of the technology and used dielectric material are given. A metallo-dielectric printed capacitance is finally presented as a first demonstrator. © 2013 IEEE. Source


Singlard M.,Limoges National Superior School of Industrial Ceramics | Aimable A.,Limoges National Superior School of Industrial Ceramics | Lejeune M.,Limoges National Superior School of Industrial Ceramics | Dossou-Yovo C.,Ceradrop | And 3 more authors.
Powder Technology | Year: 2014

Ink-jet printing (IJP) is a rapid prototyping method which is very promising for the manufacturing of multilayer hybrid circuits. Before the formulation of inks, the first step aims to ensure the stability of dielectric powder suspensions with the specifications required for the IJP process in terms of solid content, particle size, rheology, and stability versus sedimentation. A commercial glass silicate powder currently used as a dielectric material was studied during an attrition milling (i) for low ceramic loading (3. vol.%) and (ii) for significant ceramic loading (20. vol.%) with different dispersants: polyelectrolytes with carboxylate groups, and sulfate groups. The milling step impact on the surface chemistry of the powder was investigated in both cases. A potassium polycarboxylate was found to be the most efficient dispersant, and the optimization of the dispersant rate was carried out through zeta potential measurements, viscosity, dispersant adsorbed rate, and sedimentation tests. An attempt of correlation between some of these properties is proposed. The preliminary ejection tests obtained with an ink prepared from an optimized suspension allowed to generate a wide range of drop velocity (0.7 to 4.2. m/s) and drop diameter (47 to 56. μm), which will be useful in a further step to optimize the characteristics of green ink-jet printed dielectric layers. © 2014 Elsevier B.V. Source

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