| Spinellisation Study of Three Different Mg0-AI20 3
Compositions Using a Dilatometer |
Ritwik Sarkar, Goutam Banerjee* and Tapan Kr. Pal
Pages : 173-175
DOi : 10.1080/0371750X.2002.10800057 |
| Abstract |
| Three different Mg0-AI20 3 spinel compositions having MgO :
Al 20 3 molar ratios 2 : 1, 1 : 1 and 1 : 2 have been studied. Isostatically
pressed green compacts of oxide mixtures were used for
the dilatometric study and a maximum temperature of 1400°C
was used. Dilatometric study reveals that the formation of spinel
starts above 1000°C for all the compositions and the linear expansion
values are in good agreement with their expected values
considering theoretically possible (maximum) spinel content. The
fall in expansion values was also observed at and above 1350°C
due to greater shrinkage rate (from sintering) than the rate of
expansion from spinellisation. The phase analyses of the final
products showed spinel as the major phase with some free oxides
due to incomplete spinellisation reaction. |
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