| Studies on Sintering of Technical Grade AluminaPart
II: Influence of Grinding and Minor
Additions on Densification of
Commercial Alumina |
P. Y. DALVI AND A. K. KULKARNI
Pages : 5-10
DOI : 10.1080/0371750X.1988.10822873 |
| Abstract |
| The influence of grinding process and minor additions like MgC03
and Ti02 on sintering behaviour of technical grade commercial
alumina has been studied with a view to making dense and impervious
alumina wares. The grinding process has significant influence on
densification of these powders prepared by variation in the ratio of
material and ball used in comminution for reduction of particle size
as well as increasing surface activity of the powders. Powders prepared
by this method showed rapid densification between 1500° and
1600°C while minor addition of Ti02 resulted in dense compacts of
these powders (over 90% T.D.) at temperatures as low as 1400°C.
Sintering treatment at higher temperature (up to 1800°C) did not
indicate further densification; however, it helped in improving
microstructural characteristics and resulted in translucency in these
samples (imperviousness), indicating recrystallization of alumina. |
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