| Influence of Preparation Conditions on Mullite
Formation in Clay-Alumina Mixtures |
A. K. KULKARNI, P. DAS AND S. V. K. RAO
Pages : 215-224
DOI : 10.1080/0371750X.1978.10840706 |
| Abstract |
| Attempts were made to study the relation between calcination
treatments and formation of mullite in clayalumina
mixtures, with a view to developing mullite body
compositions. The influence of repeated calcination an,d
grinding of mixtures calcined between 1200° and 1500°C and
sintered at 1400° and 1500°C for duration of ! hr to 4 hrs
was investigated, with a view to accelerating the formation
of mullite phase. Minor addition of MgC03 was made
in some trials. Mixtures repeatedly calcined at 1500°C
and ground, and sintered at the same temperature attained
bulk densities over 95% T.D. With MgC03 addition,
densification of the same order was obtained at a lower
temperature of sintering (1400°C). Microstructural studies
on thin sections of the sintered samples as well as X-ray
diffraction studies revealed that batches with stoichiometric
ratio of clay and alumina would need repeated
calcination and sintering at 1500°6C for the substantial
formation of mullite phase; while with MgC03 addition,
larger proportion of mullite phase could be formed even
at 1400oC with 8 hrs soaking. |
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