The glossiness of ceramic glaze is one of the important indicators to measure. Some products lose luster after firing, which is also a serious defect.
The main reason
① The glaze has less flux, high melting point, and insufficient firing temperature;
② The glaze is too thin, or the glaze is not evenly stirred during glazing;
③ When the glazed body is close to the porous body and utensils with strong water absorption, it is easy to affect the glaze surface of the glazed body;
④There is too much sulfur in the fuel, and the sulfur dioxide gas and ash will combine with the glaze to form sulfide, thereby increasing the melting point of the glaze and making the glaze surface dull.
Measures to overcome glazed matt defects of ceramic products
①Appropriately increase the concentration of the glaze or apply the glaze several times;
②Appropriately increase the flux in the glaze to reduce the refractoriness, or appropriately increase the firing temperature;
③The glazed body should avoid being close to unglazed or certain water-absorbing utensils, and the unglazed body and the glazed body cannot be fired in the same sagger
Post time: Dec-21-2022