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Centrifugal Gel Casting: A Combined Process for the Consolidation of Homogenous and Reliable Ceramics
Author(s) -
Maleksaeedi Saeed,
Paydar Mohammad Hossein,
Ma Jan
Publication year - 2010
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.1551-2916.2009.03402.x
Subject(s) - slurry , materials science , ceramic , consolidation (business) , centrifugal casting (silversmithing) , fabrication , centrifugal force , composite material , slip (aerodynamics) , viscosity , mold , composite number , metallurgy , mechanical engineering , rotational speed , engineering , medicine , alternative medicine , accounting , pathology , business , aerospace engineering
In this work, a combined process, called centrifugal gel casting (CGC), was proposed for the fabrication of homogenous and reliable monolithic and composite ceramics starting from submicrometer‐sized powders. This method exploits the advantages of both conventional gel casting (GC) and centrifugal slip casting (CSC), while overcoming the limitations associated with the two methods. Via this process, a relatively low centrifugal force is applied to form a highly concentrated slurry in the mold cavity, which is then followed by in situ polymerization of slurry during gelation. In this work, concentrated alumina slurries with different solid contents from 45 to 65 vol% were consolidated by the three forming methods mentioned above. Various properties of green and fired products were measured and compared. Shorter processing time, lower centrifugal force, higher green strength, and minimal segregation are observed to be the characteristics of CGC in comparison with CSC. In situ elimination of bubbles with no need for degassing and the ability to remove heterogeneities, on top of high reliability and the potential to process higher viscosity slurries, are the main advantages of this method over the conventional GC.