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Bimaterial Composites via Colloidal Rolling Techniques: I, Microstructure Evolution during Rolling
Author(s) -
Me Mohan,
Chen IWei
Publication year - 1999
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.1151-2916.1999.tb02259.x
Subject(s) - materials science , slurry , composite material , microstructure , ceramic , yield (engineering) , phase (matter) , stress (linguistics) , linguistics , chemistry , philosophy , organic chemistry
Laminate composites of Al 2 O 3 and ZrO 2 fabricated by repeated rolling and folding are demonstrated using aqueous slurries of ceramic powders without any plasticizers or binders. Crack‐free composites with a layer thickness of 4‐60 µm have been obtained. A novel interface instability during the rolling of bimaterial slurries, which leads to the entrapment of the rheologically harder phase in the softer phase, also has been discovered. This discovery has been exploited to obtain layered materials, by matching the yield stress of the slurries, or cellular materials with the desired included phase, by mismatching the yield stress of the slurries. Adjustment of the yield stress can be realized by varying only the NH 4 NO 3 salt concentration while keeping the pH and the solids loading (64 vol%) constant.