The Microstructure And Optical Properties Of Amorphous Phase-separation Glaze In A R₂O-RO-Al₂O₃-SiO₂-P₂O₅ System

According to the theory of amorphous photonic crystal, the phase separation structure in particular of light scattering, reflection and diffraction can generate color effect in the ceramic glaze, which made the preparation of green pollution-free color glaze without containing rare earth and transition metals elements is possible. The effect of the chemical composition and firing schedules of phase-separation glaze of R2O-RO-Al2O3-Si O2-P2O5 system on the microstructure were studied system in this paper, the effect of the microstructure on the optical properties such as whiteness, gloss and colour of glaze were also studied. The effect of iron and copper coloring ions on the microstructure and coloring of phase-separation glaze was investigated, the microstructure and coloring mechanism of phase-separation glaze containing phosphorus and boron with the effect of structure color were preliminary studied at final.First, the optimal formula range of the phase-separation glaze of amorphous structure of R2O-RO-Al2O3-Si O2-P2O5 system were defined by orthogonal experiment design and quartering batching method in this paper. Found that the firing temperature of 1200℃, at the composition area of high silicon, low aluminum and rich phosphorus, with a high whiteness and glossiness, and can also get a uniform phase-separation structure in the glaze.The effects of the firing schedules and the content of P2O5 on the microstructure and optical properties of phase-separation glaze were discussed. It was discovered that the heating schedules of 5-10℃/min, firing temperature of 1200 ℃, holding time of 10 min and the furnace cooling were the optimal firing schedules of the phase-separation glaze, the phase-separation structure of the sizes close to wavelength range of visible light, uniform distribution and tightly stacking, and get the high whiteness(93.1), glossiness(91.5) and glazed smooth. The size of particles, distribution and arrangement were significant influenced by the firing schedules. P2O5 can promote phase separation of glaze, an appropriate amount of P2O5 is not only beneficial to forming the whole of amorphous phase, but also forming a better uniform phase-separation microstructure, so that preferably opacification effect can be obtained.The effect of iron and copper coloring ions on the microstructure and coloring of phase-separation glaze was also investigated. It was discovered that phase-separation glaze with worm-like network connectivity structure with lighter coloring after adding a coloring ions, and spherical droplets structure with brighter coloring, and It will not change the phase-separation structure of the glaze after adding a coloring ions.The effect of the common function of phosphorus and boron on the microstructure and coloring of phase-separation glaze was studied at final. Experimental results it is concluded that, when the ratio of B2O3 and P2O5 between 2:1 and 3:1, the different composition can get network or spherical phase separation structure of a small split(below 200 nm) and uniform distribution, the cross-section of the glaze can observe blue gloss clearly.