Hydrolysis-Induced Aqueous Gelcasting of Magnesium Aluminate Spinel

authors	Ganesh, I; Reddy, GJ; Sundararajan, G; Olhero, SM; Torres, PMC; Ferreira, JMF
nationality	International
journal	INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
keywords	MGAL2O4 SPINEL; ASSISTED SOLIDIFICATION; DENSIFICATION BEHAVIOR; CERAMICS; POWDERS; ROUTE
abstract	This paper reports on the synthesis of magnesium aluminate spinel (MAS) powders and consolidation of MAS ceramics by hydrolysis-induced aqueous gelcasting (GCHAS). The MAS powders surface passivated against hydrolysis were dispersed in an aqueous-organic premix solution using suitable dispersants. The consolidation of green bodies occurred under ambient conditions by adding a polymerization initiator, a catalyst, and AlN (0-4.06 wt%) as a cosetting agent. Green samples with exceptionally high green strength (similar to 21 MPa) were obtained in the presence of 4.06 wt% AlN. Sintered (1650 degrees C, 1 h) MAS ceramics consolidated by GCHAS exhibited mechanical properties that are comparable to those consolidated by dry pressing.
publisher	WILEY-BLACKWELL
issn	1546-542X
year published	2011
volume	8
issue	4
beginning page	873
ending page	884
digital object identifier (doi)	10.1111/j.1744-7402.2010.02520.x
web of science category	Materials Science, Ceramics
subject category	Materials Science
unique article identifier	WOS:000292450800020