THE INVESTIGATION OF THE PORE STRUCTURE OF FINE ALUMINA POWDERS PREPARED FOR CERAMIC PRODUCTION BY THE TECHNIQUE OF PRECIPITATION FROM SOLUTION

Authors : K. ADA

Pages : 0-0

Doi:10.1501/Commub_0000000376

View : 15 | Download : 6

Publication Date : 2000-01-01

Article Type : Research Paper

Abstract :In this study, alumina precursors were prepared in three different ways and were converted into three different alumina powders insert ignore into journalissuearticles values(A12O3); by calcination. The precipitation methods of the alumina precursors were as follows: i); Addition in excess of a 25% NH3 solution dropwise for two hours, to a boiling 0.08 M A12insert ignore into journalissuearticles values(SO4);3 solution which was already buffered by NH3 / NH4C1. ii); Boiling for two hours a 0.006 M A12insert ignore into journalissuearticles values(SO4);3 solution which contains C2H |insert ignore into journalissuearticles values(COinsert ignore into journalissuearticles values();[[);2. \H4C1 and insert ignore into journalissuearticles values(NH^CO. iii); Boiling for two hours a 0.2 M A12insert ignore into journalissuearticles values(SO4);3 solution which contains excess insert ignore into journalissuearticles values(NH2);2CO. hi orda- to find out the effect of the followed procedure on the pore structure, the following determinations were realized. The powder shapes and sizes were determined by electron microscopy. The specific surface areas and the adsorption heats of these powders were calculated from the adsorption data. The mesopore size distribution curves were plotted by using the desorption data. The specific micropore, mesopore and micropore-mesopore volumes were determined by extrapolating these curves. Finally, the dependence of the pore structure rm the procedure of preparation w`as discussed in detail.
Keywords : INVESTIGATION, ALUMINA, CERAMIC