|Monthly Tech-Tip |
The calcination of kaolin is normally done between 400-600C. However higher temperatures are employed to produce the spinel and mullite phases. If temperature is allowed to exceed 1100°C, a cristobalite will form.
In ceramics, cristobalite is a crystalline form of silica formed in the matrix of clay bodies as they fire in the kiln. Silica can also exist as quartz (the most common) and tridymite.
|By Tony Hansen|
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