ceramic mugs What is the reason of the glazed post-cracking?

Ceramic mugs glazed prone to post-cracking phenomenon. The main reason for this phenomenon is the product of moisture expansion, glazed by the tension cracks. In addition, the

green body in the vitreous and amorphous solid material to produce wet expansion. This is mainly feldspar flux formation of potassium and sodium in glass in the role of water

exchange of hydrogen ions in the water too fast, so that the pH value increased, the erosion of the enhanced role of the hydroxide ion on the glass, resulting in a large wet

expansion. Moisture expansion, mainly due to a large green body porosity, easy to absorb water due. Calcium and magnesium in the glass under the same conditions of moisture

expansion is much smaller, and decrease with the increase of calcium and magnesium content.