Fabrication of low-temperature co-fired ceramics micro-fluidic devices using sacrificial carbon layers

Ease of fabrication and design flexibility are two attractive features of low temperature co-fired ceramics (LTCC) technology for fabrication of complex micro-fluidic devices. Such structures are designed and processed using different shaping methods, the extent and complexity of which depends on the final device specifications (dimensions, mechanical and functional properties). In this work, we propose a sacrificial layer method based on carbon-black paste, which burns out during the LTCC firing stage. The paper will summarize the preparation of the paste, influence of processing conditions on the final dimensions, and demonstrate the mechanically integrated structures obtained using this technique. Some of those are membranes of various diameters (7-12mm) with a thickness of 40utm and a variety of internal spacing (1 5-6outm), free-hanging thick-film resistors (TFR) bridges on LTCC for heating micro-volumes. The main methods of the study will be thermo gravimetric analysis (TGA), scanning electron microscopy (SEM) and dilatometry in addition to electronic instruments for device characterization.

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International Journal of Applied Ceramic Technology, 2, 5, 364-373
Derniers résultats sur la technique de couche sacrifiicielle. La température de fermeture de la porosité est d’env. 780°C. Suivant la vitesse de montée en température, on risque d’avoir des problèmes à oxyder tout le carbone avant. En jouant sur cette vitesse et sur la quantité de carbone, on peut contrôler l’équilibre entre les tendences des structures à s’affaisser ou à bomber. Initialement présenté à IMAPS 2005 Baltimore.
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 Record created 2006-06-27, last modified 2020-10-28

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