Akermanite (Ca2MgSi2O7) ceramic powders were prepared by a wet solid-state
synthesis process using a mixture of oxide sources. The mechanism of phase
formation included the formation of transition compounds such as diopside
and merwinite. The compacted disks of the dried mixture were sintered at
1200, 1225 and 1250?C for different dwell times (2, 4 and 6 h). The effect
of sintering temperature on the physical properties (relative density and
diameter shrinkage), grain growth kinetics (grain growth activation energy)
and mechanical properties (flexural strength) of the akermanite ceramics
were evaluated. It was shown that the increase in sintering temperature from
1200 to 1250?C decreased the porosity and increased the diameter shrinkage
and relative density of Ca2MgSi2O7 ceramics. The grain growth activation
energy was also found to increase with the increase of sintering
temperature. Finally, the increase in density yielded ceramics with high
mechanical strength.
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