Fluxes - The Role of Fluxes in Ceramic Formulations and Some Common Flux Materials

In ceramics, the addition of a flux lowers the melting point of the body or glaze. In particular they affect the melting point of silica (SiO2), which melts to form a glassy phase during firing/sintering which bonds the ceramic body or forms the basis of a glaze. The addition of a flux also promotes fusion or vitrification (formation of a glassy phase) at lower temperatures than would otherwise possible without the use of a flux.

Some common fluxes include:

         Nephelene syenite

         Barium carbonate (BaCO3)

         Alkali metal oxides and alkali metal containing feldspars such as potash feldspar (K2O.Al2O3.6SiO2), soda feldspar (Na2O.Al2O3. 6SiO2) and lithium feldspar (Li2O. Al2O3.8SiO2)

         Lead compounds

 

Primary author: AZoM.com

 

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