Study On The Preparation Of Zn₂SiO₄ Powder And Zn₂SiO₄ Crystalline Glaze

materials have attracted great interests in recently times owing to their potential applications including glaze, coating material and luminous matrix. They are widely known to possess excellent phy-chemical properties like good environmental adaptability, humidity resistance and chemical stability. Zn2SiO4 crystalline glaze is widely used in building ceramic. When different metal ions were doped into Zn2SiO4 crystalline glaze, the ceramic products have more prominent artistic value, higher grades and more characteristics.(1) The hydrothermal method was employed to synthesize Zn2SiO4 crystal by using zinc acetate as zinc source and TEOS(tetraethoxysilane) as silicon sources. The paper studied the influence of reaction time, temperature,. pH and different reaction solvent upon the growth of Zn2SiO4 crystal. Moreover, we used X-ray diffraction(XRD) to analyze the powder phase and Scanning electron microscope(SEM) together with Transmission electron microscope(TEM) to characterize the structure and morphology of the sample particles in the process of gathering the ball. The growth kinetics of Zn2SiO4 crystal was investigated through the calculation of JMA equation. The result revealed that globular Zn2SiO4 became greater in size and crystallization properties of Zn2SiO4 got enchanced with the elevation of temperature and the extention of reaction time. The Avrami exponent of Zn2SiO4 was n145℃=0.55, n165℃=0.60, n205℃=0.71,n185℃=0.85, respectively. It revealed the formation of crystals had a trend from diffusion mechanism to the nucleation mechanism.(2) The Zn2SiO4 crystalline glaze was prepared using quartz, albite, kaolin, limestone, zinc oxide as raw materials by controlling the sintering temperature in this paper. The influence of Co-doping on the Zn2SiO4 crystalline glaze was studied. The phase of the samples was analysed through X-ray diffraction (XRD). The morphology was characterised by Scanning electron microscope (SEM). The chromatic value of samples was studied by colorspec. The results revealed that the Zn2SiO4 crystal in glaze reached the maximum value with the ZnO content of 24 wt%. When the content of additive Co2O3 was 7 wt%, the Zn3SiO4 crystalline has the deepest blue color. When the Co2O3 content reached 9 wt%, Co2SiO4 crystal was observed in glaze.(3) Co2+ doped Zn2SiO4 crystalline glaze with ZnO as a nucleation agent was prepared from quartz, albite, limestone, kaolin, zinc oxide as raw materials by controlling the sintering temperature in this paper. The crystal stucture of the samples was analysed by X-ray diffraction(XRD). The chromatic value of the samples was studied by colorspec.The sample content was measured by Energy Dispersive Spectrometer(EDS). The growth kinetics of Co2+ doped Zn2SiO4 crystal in glaze has been studied by JMA equation, which helps investigate the growth mechanism of sample crystal. The results revealed that Co2+ doped Zn2SiO4 crystal became greater in size with the extention of soaking time and reached the maximum value when the soaking time was 170min at 1140℃. The Avrami exponent of crystal is n1100℃=0.82, n1140℃=1.23, n1180℃=1.12, respectively. It revealed the formation of crystals had a trend from diffusion mechanism to the nucleation mechanism. The sample activation energy Ea was 148.2kJ/mol through Arrhenius equation.