Characterization of Zirconia Sizing Nozzle Modifying Addictives Preparated by Sol-Gel Method

Liang Zhao; Qun Hu Xue; Dong Hai Ding

doi:10.4028/www.scientific.net/AMR.1078.31

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1078Characterization of Zirconia Sizing Nozzle...

Characterization of Zirconia Sizing Nozzle Modifying Addictives Preparated by Sol-Gel Method

Abstract:

MgO-Al₂O₃-ZrO₂composite powders with 3 kinds of mass ratio were synthesized by sol–gel method using MgCl₂·6H₂O, AlCl₃·6H₂O and ZrOCl₂·8H₂O as starting materials, and NH₃·H₂O as a precipitant. The composite powders which match with zirconium oxide particle size and evenly distribute can are advantageous to the formation of metastable t-ZrO₂ and restrain the grain growth as the additive of modified sizing nozzle. Chemical composition, mineral phase, particle size distribution and micro-morphology of the composite powders were investigated by X-ray fluorescence instrument, X-ray diffractometer, laser particle size analyzer and scanning electron microscope. Research showed that under the process that the concentration of MgCl₂ solution 0.2 mol/L, AlCl₃ and ZrOCl₂ solution concentration 0.5 mol/L, the pH controlled between 10 ~ 11, PEG as the surfactant, drying at 70°C±5°C, heat treatment temperature at 800°C for 3h, particle size distribution of MgO-Al₂O₃-ZrO₂ composite powders were: d₁₀ = 1.28 μm, d₅₀ = 4.65μm, d₉₀ = 11.13μm (MgO 10%); d₁₀ = 1.15μm, d₅₀ = 5.80μm, d₉₀ = 15.13μm (MgO 15%);d₁₀ = 1.21μm, d₅₀ = 6.59μm, d₉₀ = 16.87μm (MgO 20%). With the rising of heat treatment temperature, the crystallization degree of composite powders increased, at 800 °C a small amount of t - ZrO₂ precipitated, meanwhile MgO and Al₂O₃ are still in the amorphous phase. The MgO-A1₂O₃-ZrO₂ composite powders under this condition have high reactivity and uniform distribution.