Discussion
Match each thermal event in a clay with the technique that shows it most directly.
List I
A. Loss of adsorbed water
B. Dehydroxylation
C. Mullite formation
D. Quartz inversion
List II
1. Exotherm near 1,000 degrees
2. Mass loss near 100 degrees
3. Sharp expansion step at 573 degrees
4. Endotherm near 550 degrees
Answer: A
Thermogravimetry follows the mass losses, differential thermal analysis the heat effects and dilatometry the dimensional ones. Running them together gives a far fuller account of a clay's firing behaviour than any one alone.
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