Clay bricks are typically fired (baked) in a kiln at temperatures between 900°C and 1,200°C (1,650°F – 2,190°F).
Here’s a quick breakdown of what happens at each stage:
1. Below 200°C (392°F) – Drying stage:
Water is removed from the clay.
The brick becomes hard but still fragile.
2. 200°C–600°C (392°F–1,112°F) – Dehydration & oxidation:
Remaining chemical water and organic materials are burned off.
3. 600°C–900°C (1,112°F–1,650°F) – Sintering begins:
Clay particles start fusing together.
The brick becomes stronger and less porous.
4. 900°C–1,200°C (1,650°F–2,190°F) – Vitrification stage:
Silica and alumina melt slightly, forming a glassy bond.
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