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Electrical Porcelain - Glaze Pinhole Problems

Electrical Porcelain - Glaze Pinhole Problems

Electrical Porcelain - Glaze Pinhole Problems

(OP)
Our factory produces porcelain products for the electrical industry. We changed our blue-grey glaze formula from a barium based glaze to a strontium carbonate formula. We have been having a serious problem with pinholes in the glazed surface. Does anyone have any suggestions, or just some information on the phenomena of pinholing?

Lyn

RE: Electrical Porcelain - Glaze Pinhole Problems

Dear mlyn,

Barium and strontium are in the same family but I suspect the strontium carbonate is decomposing differently than barium carbonate.  I would check the TGA of both, and in addition verify cleaniness of your surfaces.  Then change the firing profile based on TGA curves.

Best Regards,

Genesis

Genesis

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