I want to manipulate the grain size of a kind of ceramic powder. My preliminary strategy is to extend the heat treatment time from 1 hour to 16 hours, hoping to get various grain size. Do you think it is possible? Or is there a better idea?
According to kinetics, time and temperature are two factors that affect the grain growth. But increasing temperature is much more effective than increasing time.
Prolonged heat treatment is a solution for grain size increment in metals. For ceramics this phenomenon is rather longer, but possible.
As an alternative way to increase the grain size, you could look at the powder production method and the production parameters.
My powder was produced by high energy ball milling. From this base, I want powder with different grain size, so what ehsan said may not be possible.
I think higher temperatures in this strategy cause to increase the grain size.I suggest the use of micro-alloying elements are defined as.
According to kinetics, time and temperature are two factors that affect the grain growth. But increasing temperature is much more effective than increasing time.
Thank you guys so much. I will try to increase the temperature firstly as suggested by Amins......
If possible try 0,8 or 0,9 * the melting temp. in K in a vacuum furnace...
Increasing temperature is more effective than increasing time get larger grain size in sintered samples. Initial size and distribution is also important in predicting the final size after sintering. To control the grain size various additions can be made to the starting powder to control the grain size at a particular sintering temperature.
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