Saturday, 14 November 2015

The Synthesis of Single Tetragonal Phase Zirconia by Sol-Gel Route

Abstract Zirconia with tetragonal phase is a widely used functional material to toughen ceramics. At room temperature zirconia usually presents in the less stable form of monoclinic phase. In this paper, room temperature single tetragonal phase zirconia stabilized by yttria was successfully synthesized by a sol-gel route at a relative low temperature (≤1000oC). The calcination mechanism of zirconia was determined by thermogravimetric analysis and differential scanning calorimetry, which indicated that phase formation of zirconia started above 600oC. X-ray diffraction patterns showed stabilized with 3mol % yttria was insufficient to obtain fully single tetragonal phase zirconia. As the content of the stabilizer increased, single tetragonal phase zirconia was obtained as observed by Raman spectrum and X-ray diffraction. With 4mol% yttria content, zirconia remains stable with the desired tetragonal phase at room temperature.

Keywords Zirconia, tetragonal phase, sol-gel, phase characterization.

Highlights

  • nYSZ (n=3, 3.5, and 4) were synthesized by Pechini sol-gel route successfully.
  • The phase status of 3YSZ, 3.5YSZ, and 4YSZ was investigated.
  • The 4YSZ with the pure tetragonal phase at room temperature was obtained.
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