In Situ Synthesis of Yttria‐Stabilized Tetragonal Zirconia Polycrystal Powder Containing Dispersed Titanium Carbide by Selective Carbonization

Abstract

Reaction thermodynamics was utilized to analyze the selective carbonization conditions of ZrO 2 -TiO 2 -Y 2 O 3 ultrafine powder and to define the temperature range of the selective carbonization. The ZrO 2 -TiO 2 -Y 2 O 3 powder was prepared by coprecipitation from a solution containing Zr 4+ , Ti 4+ , and Y 3+ . The powder was selectively carbonized at 1350°, 1450°, 1550°, and 1650°C, respectively, for 2 h under argon atmosphere with sucrose as the carbon source. The resulting product was analyzed by X-ray diffraction. The experimental results indicated that the ZrO 2 -TiO 2 -Y 2 O 3 powder could be selectively carbonized in situ at 1450°C to form a carbonized powder which was composed of TiC and tZrO 2 . It was also found that zirconium carbide could be formed at 1550°C, which is much lower than the carbonization temperature of ZrO 2 defined by thermodynamics.

Tetragonal zirconia spheres fabricated by carbon-assisted selective laser heating in a liquid medium

“…Most importantly, for submicrometer-sized tetragonal ZrO 2 , doping with other metal oxides (e.g. Al 2 O 3 , Y 2 O 3 , MgO, etc [23][24][25][26][27]) is necessary to stabilize the tetragonal phase at room temperature, and very little work was found on tetragonal phase ZrO 2 spheres without dopants.…”