Abstract: The lead-free CuO-MnO₂ system metallic luster glaze was prepared by adding crystallizer CuO and MnO₂ based on calcium raw glaze. The phase composition and microstructure were characterized by XRD and SEM-EDS, and the influences of adding TiO₂, V₂O₅ and glass powder on the phase separation of metallic luster glaze were systematically investigated. The results show that a certain amount of TiO₂ and V₂O₅ effectively promotes the phase separation of the glaze.The high temperature viscosity of the glaze melt is reduced by partially replacing the potassium feldspar in the base glaze with glass powder, further aggravates the glaze phase separation, promotes the precipitation and enrichment of CuMn₂O₄copper manganese spinel on the glaze surface. When the amount of TiO₂ is 2%, V₂O₅is 1%, and the amount of glass powder is 25% (both are mass fraction), the effect of glossy glaze is the best.

Key words: phase separation, surface tension, CuO-MnO₂ system, lead-free metallic luster glaze