LMPEQ

Sidi Yahia el Gharb, Morocco
Sidi Yahia el Gharb, Morocco
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El Hafiane Y.,LMPEQ | Smith A.,CNRS Heterogeneous Materials Study Group | Abouliatim Y.,LMPEQ | Chartier T.,Limoges National Superior School of Industrial Ceramics | And 2 more authors.
Journal of the European Ceramic Society | Year: 2014

Tape casting is a process often used for the preparation of microelectronics substrates. The present work is a continuation of the first part where we have discussed the structural and microstructural characteristics of calcium aluminate cement tape. Indeed, in this second part, we focus on the physical properties of these tapes such as electrical, thermal, mechanical characterizations and surface roughness. We studied in particular how these physical properties vary according to the setting environment (water, air at 50% relative humidity or air saturated in humidity), setting time (1 day, 4 days or 1 month) and setting temperature (20. °C or 70. °C in the case of water setting environment). A Heat treatment on the consolidated tape was made essentially to decrease the dielectric constant. Following our results and comparing the physical properties with those of substrates commonly used in microelectronics, in particular alumina substrates, our films can be potentially used as microelectronics substrate. © 2013 Elsevier Ltd.


El Hafiane Y.,LMPEQ | Smith A.,CNRS Heterogeneous Materials Study Group | Abouliatim Y.,LMPEQ | Chartier T.,Limoges National Superior School of Industrial Ceramics | And 2 more authors.
Journal of the European Ceramic Society | Year: 2014

This present paper concerns the structural and microstructural characterization of 1. mm thick calcium aluminate cement tapes prepared by tape casting. A study of the effect of environment, time and the consolidation temperature on the structural properties and microstructure has been undertaken. Consolidation environments studied are air, water and an environment saturated in humidity for storage durations of 1, 4 or 30 days at a temperature of 20 or 70. °C. The structural characterization was carried out using XRD. The microstructural characterization was carried out through the distribution of pore volume by mercury porosimetry measurements and SEM micrographs. The effects of the various consolidation parameters were compared and discussed. The tape consolidated for 30 days in water at 70. °C has the most advanced hydration with the formation of stable hydrates. This is evidenced by the reduction of the inter-granular pore size and the microstructure densification. © 2013 Elsevier Ltd.


El Hafiane Y.,LMPEQ | Smith A.,CNRS Heterogeneous Materials Study Group | Chartier T.,Limoges National Superior School of Industrial Ceramics | Abouliatim Y.,LMPEQ | And 2 more authors.
Journal of the European Ceramic Society | Year: 2012

An aluminous cement (Secar 71 from Lafarge) has been used for preparing millimetre thick films by tape casting. Slurry preparation is described. The effect of several dispersants has been studied. The optimum dispersion, associated with the minimum viscosity, is obtained with minimal amounts of dispersant in the case of acetic and propionic acids. Indeed, the corresponding quantities of dispersant are less than 0.5% by weight relative to cement. In addition to its dispersive role, acetic acid plays a role in the setting. It has a retarding effect below 1% by weight relative to the mass of cement and from this amount, it plays an accelerating role on setting. Tapes prepared with cement, water, acetic acid, PEG 300 have been left to set in different environments at 20°C (50% or 95% relative humidity, water). The formation of aluminous calcium hydrates is most important when setting is done in water. Lastly, the advantage of setting in water is also discussed with respect to the elimination of the different organic products that have been used for tape casting. © 2012 Elsevier Ltd.

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