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Tape Casting of Lanthanum Chromite
Author(s) -
Murphy Michael W.,
Armstrong Timothy R.,
Smith Peter A.
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02805.x
Subject(s) - plasticizer , materials science , dispersant , microstructure , solvent , composite material , rheology , casting , chemical engineering , organic chemistry , chemistry , dispersion (optics) , physics , optics , engineering
The effects of process additives, ball milling, and solids loading were evaluated for tape casting suspensions of glycinenitrate‐synthesized La 0.7 Ca 0.31 CrO 3 powder. An optimized formulation was obtained based on rheological characterization, electrokinetic sonic amplitude measurements, qualitative examination of green tapes, and the sintered microstructure. The tape casting formulation incorporated 66:34 methyl ethyl ketone/ethyl alcohol solvent, an aliphatic phosphate ester dispersant, and 80 wt% (35 vol%) solids. The best binder/plasticizer system was 12 wt% (15 vol%) poly(isobutyl methacrylate) and 5 wt% (6.3 vol%) benzyl butyl phthalate plasticizer (binder:plasticizer = 2.3). Cast tapes were sintered at 1300°C for 2 h, producing a bulk density of 96.2% theoretical, with linear shrinkage of 22% and an approximate grain size of 1.3 μm.