UV curable systems for tape casting

Thierry Chartier

doi:10.1016/S0955-2219(98)00177-0

UV curable systems for tape casting

1999-01-01

49

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DOI：10.1016/S0955-2219(98)00177-0

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The substitution of solvents by photopolymerizable binders in the tape casting process allows to achieve high ceramic loading and to eliminate the drying stage which is a critical step of the tape casting process. After the rapid UV polymerization of the resin, the high strength green tapes can be debinded and sintered. Ceramic suspensions containing alumina or zirconia powder, dispersant, UV curable binder and photoinitiator have been prepared. The use of a low viscosity organic vehicle allows to prepare low viscosity ceramic suspensions, containing about 50 vol% powder, which have a shear thinning behaviour. Because of the rapid attenuation of the incident light in UV curing systems containing ceramic particles it is important to estimate the thickness of the tape that can be treated. The effect of incident energy, of photoinitiator concentration and of powder volume fraction was studied. There is an optimal photoinitiator concentration which maximizes the cured depth and which depends on the volume fraction of solid. A theoretical model based on the Beer-Lambert's law enables the prediction of cured depth for any volume fraction of solid. To prove the ability to manufacture ceramic sheets by tape casting, some suspensions were tape cast. (C) 1998 Elsevier Science Limited. All rights reserved.

Keyword:

tape casting

suspensions

Al2O3

ZrO2

UV curable binders

UV curable systems for tape casting

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