Barium Carbonate

> Chemical Formula: BaCO₃

> Appearance: White powder, insoluble in water

> Key Characteristics: High thermal stability, high melting point, decomposes at elevated temperatures into BaO (Barium Oxide) and releases CO₂.

> Function: Commonly used in ceramic formulations as a flux, modifier, and sintering aid.

Major Applications

(1) Ceramic Glazes:

> Fluxing Agent: Decomposed BaO lowers the melting point of glaze, facilitating smooth melting.

> Gloss Enhancement: Provides high transparency and glassy appearance to glazes.

> Color Development: Influences glaze coloration, brightens hues, and modifies tones (notably in copper red and iron blue glazes).

>Surface Properties: Improves the hardness and abrasion resistance of the glaze layer.



(2) Ceramic Bodies:

> Improved Plasticity and Sintering: Small additions of BaCO₃ adjust body shrinkage, reducing firing cracks.

> Efflorescence Control: In brick and tile production, BaCO₃ reacts with soluble sulfates to form insoluble barium sulfate (BaSO₄), preventing surface scumming or efflorescence.



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