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CerDoc>CeramicMaterials>Magnesium Carbonate =  Magnesium Carbonate, light = Magnesite 
分子式 分子量
M.F. M.W.
3MgCO3 · Mg(OH)2 · 3H2O 365.31

Light Magnesium Carbonate is added (.12-.25%) to flocculate clay slurries, improving and stabilizing the set and suspension characteristics.

Magnesium Carbonate is used in low fire glazes in to produce opacity and matteness.

 

In glaze melts it is an active flux at higher temperatures (2150C+), and it produces elasticity, a lower expansion coefficient and smooth buttery surfaces. At lower temperatures it is a refractory and will matte glazes and make them crawl due to its high shrinkage and contributions to the suface tension of the melt.

  • Surface Modifier

    • Matte - In low temperature glazes Magnesium Carbonate in amounts to 15% acts as a refractory, remaining in suspension in the glaze melt to produce a white opaque matte glaze.

    • Crawling - Magnesium Carbonate is commonly added to glazes, especially at low fire, to make them crawl. This often produces dramatic visual effects, especially if the crawling glaze color contrasts with the underlying body or slip. Additions vary from 10-30% depending on the host glaze.

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