Causes of glaze shrinkage in the glaze layer in the production of ceramic tableware

Causes of glaze shrinkage in the glaze layer in the production of ceramic white porcelin dinnerware. The phenomenon of the ceramic glaze layer curling, agglomerating and separating from the body is generally called shrinkage. There are two main reasons: one is the dust in the glaze and the shrinkage of the glaze itself. . Some glazes, especially those containing tin oxide, will shrink and become larger lumps if the glaze is applied too thickly or on a dirty surface. The remedy is to wipe off the dust on the surface of the blank with a wet sponge. Establish dust removal room to avoid dust falling off. If the glaze needs to be thickened properly, a small amount (3%) of bentonite can be added to the glaze. Underglaze painting is prone to shrinkage defects, because the color material of underglaze painting is similar to the dust left under the glaze. In response to this situation, a small amount of glaze paste or a small amount of gum arabic can be mixed into the underglaze powder. The second main reason is that there are too many plastic components in the glaze, so that during the drying period, the glaze layer shrinks too much, causing micro cracks and cracking the glaze. During the firing process, glaze piles are easy to form, agglomerate into blocks, and cannot evenly melt and cover the body. Such defects often occur in unfired blanks. Therefore, this type of glaze is generally suitable for unpatched green bodies. In order to adapt to the use on biscuit blanks, some non-plastic raw materials such as calcined clay, china clay and calcite can be appropriately added to the glaze. The amount of non-plastic material added is equal to the amount of plastic material subtracted. In addition, gently rubbing the dry glaze of the porcelain white porcelin dinnerware with your fingers to make the glaze smooth and also help to eliminate some glaze cracks. When the glaze drying has not yet reached the requirements, heating too fast can easily cause defects in the glaze buildup.

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