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

Jul 21 2006

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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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Related Books

  • Ceramic Materials: Processes, Properties, and Applications
  • Integral Materials Modeling: Towards Physics-Based Through-Process Models

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