Digitalfire Ceramic Glossary

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Oxide Interaction


In a glaze melt, oxides do not act alone, they interact. For example, while one material might not melt well by itself, when combined with others the mix as a whole can melt at a significantly lower temperature than any of the ingredients in the mix. Cornwall stone is an example, by itself it does not melt enough to even be a glaze at cone 10, but a glaze can be made using this material in combination with kaolins, silica, etc. Oxides that are even refractory by themselves can be powerful fluxes in combination with silica and alumina, a good example is the material calcium carbonate. By itself it is completely refractory and yet at cone 8-10 it is the principal flux in stoneware glazes. Thus, due to interaction, the function of the oxide is changed completely.

Out Bound Links

  • (Oxides) CaO - Calcium Oxide, Calcia
  • (Materials) Cornwall Stone

    Cornish Stone, China Stone, Corn Stn, China-stone


Pictures
Cone 11 flow test of original cornwall stone, H&G substitute 2011 and L3617 calculated equivalent


Example of calcium carbonate (top) and dolomite (both mixed with 25% bentonite). They are fired to cone 9. Both bars are porous and refractory, even powdery.


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