Rheological property and stress development during drying of tape-cast ceramic layers

Jennifer A. Lewis, Kimberly A. Blackman, Andrea L. Ogden, James A. Payne, Lorraine F Francis

Research output: Contribution to journalArticle

93 Scopus citations

Abstract

Rheological property and stress development of tape-cast ceramic layers derived from nonaqueous alumina (Al 2 O 3 )-poly(vinyl butyral) (PVB) suspensions were observed during drying. Casting suspensions exhibited strong shear-thinning behavior, with a low shear Newtonian plateau apparent viscosity >10 2 Pa·s. The apparent suspension viscosity displayed a power-law dependence on the Al 2 O 3 volume fraction during the initial stage of drying (<30% solvent loss). Stress development, measured by a cantilever deflection method, and parallel weight loss measurements were performed during the drying of tape-cast layers and pure binder coatings. Maximum drying stresses (σ max ) of 1.37-0.77 MPa were observed for plasticized tapes cast at gap heights of 150-400 μm. In contrast, nonplasticized tapes of similar thickness displayed a more gradual stress increase, with σ max values approximately an order of magnitude higher than their plasticized counterparts. The stress histories of the corresponding binder coatings were quite similar to the tape-cast layers, albeit slightly lower σ max values were observed. Stresses decayed beyond σ max with a logarithmic time dependence to an almost constant value of 0.2-0.4 MPa for the plasticized tapes. Based on these observations, process methodologies have been offered to minimize stress development and retention in tape-cast ceramic layers.

Original languageEnglish (US)
Pages (from-to)3225-3234
Number of pages10
JournalJournal of the American Ceramic Society
Volume79
Issue number12
DOIs
StatePublished - Dec 1996

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