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Description
Key Functions and Roles in Ceramics
- Fluxing Agent: Acts as a powerful late-melting flux that lowers the melting temperature of glazes, broadens the melting range, and improves fluidity.
- Thermal Expansion & Crazing Control: Reduces the thermal expansion coefficient of glazes, which helps prevent crazing (fine cracking in the glaze layer) and improves thermal stability.
- Surface Texture and Finish:
- In lower amounts (under 5%), it enhances gloss, brilliance, and whiteness.
- In higher amounts (around 10% or more), it promotes opacity and transforms glossy surfaces into matte or satin finishes.
- Crystalline Glazes: Used in high proportions (up to ~25%) in specialty crystalline glazes to grow decorative zinc silicate (willemite) crystals during controlled cooling cycles.
- Moisture Resistance: In architectural tile and brick manufacturing, fine particle dispersion helps lower water absorption in floor and wall tiles
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