What results from increasing the firing temperature?

Unit 2 Topic 7
The Glaze Triangle
If the flux content of a recipe is kept constant the firing temperature will determine the amount of amphoteric (Al2O3) and acid (SiO2) that can be dissolved in the melt.

When a glaze is fired and it does not melt sufficiently to form a good glass there is likely to be excessive amphoteric and/or acid oxides (i.e. Al2O3 and/or SiO2) causing stiffness and opacity.

Another way to think of this is that there is insufficient flux oxides in the glaze to take up the available alumina and silica.

It is a question of getting the right balance of fluxes on the one hand and alumina and silica on the other.


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