Glazed tiles have smooth and delicate surface texture and elegant patterns, so they are favored by the market and are one of the main products in the building ceramics market. However, due to the glaze effect of glazed tiles, their appearance defects will be more obvious than other building ceramic products, so their glaze quality standard will be more strict than other building ceramic products. So, if there are defects, how to solve them?
1. Properly select the concentration of glaze.
When glazing, the concentration of glaze slurry should be properly selected. If the glaze concentration is too high, the glaze layer on the green body is too thin, resulting in rough marks on the glaze of the fired product and poor gloss of the glaze after firing. However, if the concentration of glaze slurry is too high, not only the glazing operation is not easy to master, but also the edges and corners inside the green body are often not glazed. The glaze surface is easy to crack after glazing, and glaze piles may appear on the surface of the products after firing.
2. Pay attention to the fineness of the glaze.
If the glaze is crushed too fine, the adhesion and water content of the glaze slurry will be too large. After dry glazing, the glaze surface is easy to crack, and the glaze layer tilts away from the body. If the glaze is thick, this defect is more obvious. However, if the glaze grinding is not sufficient, the adhesion of the glaze slurry is too small, and the components in the glaze are easy to precipitate. In addition, the glaze layer is not firmly attached to the green body. If this happens, it can be eliminated by adding a small amount of gel or organic matter.
3. Composition of glaze and billet.
Adding too much plastic to the glaze will also cause excessive adhesion of the glaze slurry. After glazing, it is easy to crack and the glaze layer rolls up. The content of viscous substances should be adjusted. Too many plastic raw materials in the green body will also affect the glazing quality. Because the structure of green body is too dense and lack of permeability. When applying glaze, the surface of the green body absorbs water and expands, but the water is difficult to penetrate into the inside of the green body, resulting in inconsistent expansion and cracking of the inner and outer layers.