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Manipulation of Sintering Behavior by Initial Freeze Pressing an Aqueous Alumina Suspension
Author(s) -
Zheng Jumeng,
Winnubst Louis,
Fang Shumin,
Salamon David
Publication year - 2011
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201000199
Subject(s) - materials science , sintering , suspension (topology) , pressing , shrinkage , ceramic , aqueous suspension , particle (ecology) , composite material , green body , coagulation , aqueous solution , metallurgy , chemistry , psychology , oceanography , mathematics , homotopy , psychiatry , pure mathematics , geology
Forces created by the expansion of water during freezing (ice formation) are in nature responsible for many significant changes of materials. The coagulation of particles was observed after freezing and thawing of a particles suspension. Here we show how freezing of a suspension can create internal forces comparable with hundreds MPa of conventional pressure. The way of freezing and particle characteristics determine the quantity and character of formed aggregates. The morphology/particle packing of the green body after thawing and drying significantly influences the sintering behavior of the ceramic compact. Our results demonstrate a possibility to substitute an effect of high mechanical pressure by freeze pressing without shape limitations. We anticipate our work to be a novel way to combine various materials with different shrinkage behavior.