| The color glaze of low firing temperature and low expansion coefficient, to match the glaze tile made from common clay, was prepared in lead borosilicate system. The technique key of one step firing is to improve the adhesion of glaze to clay body, which can be realized by controlling the fineness and concentration of glaze, drying and preheating the greed body, adding soft clay and organic binder. In addition when one step firing is to be in process, the thickness of glaze should be slightly thicker, the rate of heating be rather slower and the soaking time be properly longer in comparison with twice firing. |