| Studies on Liquid-Phase Sintering of MgO-China
Clay Compactst |
K. K. SINGH, V. A. ALTEKAR AND M. D. NARASIMHAN*
Pages : 158-163
DOI : 10.1080/0371750X.1983.10822657 |
| Abstract |
| Studies on liquid-phase sintering were carried out on different MgOchina
clay compacts containing 4, 8, 12, 16 and 20% by weight of
china clay. Initial particle size of the powders taken was -45 microns.
The green compacts of 1.25 em dia were cold pressed at a constant
pressure of 1600 kg/cm2 and sintered in a high temperature gas fired
furnace in oxidising atmosphere at 1600°, 1650° and 1700°C for 0 to
8 hours. The rates of densification showed that Mg0-12 wt% china
clay compacts sintered at 1700°C for 4 hours, attained a maximum
value of bulk density, i.e. 3.56 gm/cc. This value was 99.44% of the
theoretical density. The same compacts, when sintered at 1650° and
1600°C for 4 hours, resulted in maximum values of bulk density,
i.e. 3.53 and 3.44 gm/cc respectively. These values were 98.60 and
96.08% of the theoretical density. The values of apparent porosity
of these sintered compacts were found to be 1.10, 3.50 and 5.20%
respectively.
For studying the kinetics of sintering, experimental data were analysed
using the empirical equation D = K log t + c. It was found
that the value of rate constant (K) for various MgO-china clay
compacts increased with increasing sintering temperature between
the period 1 and 2 hours. Microstructures revealed the presence of
periclase (MgO) as the major crystalline phase of dense sintered
MgO-china clay compacts. Other minor crystalline phases observed
were spinel (MgO.AI20 3) and forsterite (2Mg0.Si02). |
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