Effect of attritor milling on the densification of magnesium aluminate spinel

Densification of magnesium aluminate spinel was studied with both the singl e stage and double stage sintering processes using attritor mill for the re duction of particle size. Presynthesized spinel and a stoichiometric mixtur e of calcined magnesia and alumina were used for the study. Presynthesizati on of spinel and calcination of raw materials were done at 1400 and 1600 de grees C. Milling was done for 2, 4 and 6 h. Extent of milling was character ised by measuring the specific surface area of the milled powders. Densific ation was found to be greatly influenced by milling. A maximum 99.5% densif ication was obtained. (C) 1999 Elsevier Science Limited and Techna S.r.l. A ll rights reserved.