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The causes of bloating can be less than obvious. Consider these two clays: Although they have simply been slaked in water from the raw lumps and have already densified to zero porosity by cone 5 (bottom bars) they remain stable through the entire range of cone 6 to 10 and also cone 10R (bottom to top)! The test bar on the top left does have particulate impurities (mainly ironstone concretions) and both contain significant soluble salts. The cone 10 bars are melting and the firing curves for all of these were relatively fast. Yet none of these factors have resulted in any bloating.
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Bloating
Bloating occurs when the off-gassing of decomposing particles in a body has not completed by the onset of density and impermeability associated with the vitrification process. |
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