Synthesis of stabilized zirconia without dopants

Abstract

ZrO2-SiO2 powders were synthesized through Pechini's method starting with D4 Vi, PMS and zirconium citrate. The complex polymer was decomposed to form different phases at high temperatures. During the resin decomposition, the phase transformation from monoclinic to tetragonal zirconia was detected by thermal analysis. The crystallization and the diffusion process of Si and Zr were analyzed by X-ray diffraction, XRD, scanning electron microscopy and microanalysis by EDS. Tetragonal zirconia at 1000 °C, monoclinic zirconia at 1200 °C and monoclinic zirconia with cristobalite silica from 1300 ° to 1400 °C were formed. From 1000 °C to 1300 °C a diffuse amorphous band was related to the silica phase. The mapping of Kα line of Zr and Si showed low diffusion of Si into the ZrO2 structure. The kinetics of crystallization formed macroparticles of silica and small particles of zirconia. A diffusion interface between SiO2 and ZrO 2 to form ZrSiO4 phase was not observed, confirmed by XRD.