研究目的
Investigating the fabrication of transparent tetragonal-cubic zirconia composite ceramics with enhanced toughness and optical properties through spark plasma sintering and hot isostatic pressing.
研究成果
Transparent tetragonal-cubic zirconia composite ceramics were successfully fabricated, combining the toughness of tetragonal zirconia with the transparency of cubic zirconia. Air annealing significantly improved transparency by annihilating oxygen vacancies. The ceramics exhibited a linear increase in fracture toughness with tetragonal phase content, without martensitic phase transformation contribution.
研究不足
The study highlights the challenges in achieving both transparency and toughness in zirconia ceramics, particularly the trade-off between grain size reduction for transparency and the loss of transformability for toughness. The formation of color centers during SPS and HIP treatments also limits optical properties.
1：Experimental Design and Method Selection
The study utilized spark plasma sintering (SPS) followed by hot isostatic pressing (HIP) to densify zirconia ceramics. The influence of microstructure and phase composition on properties was assessed.
2：Sample Selection and Data Sources
Commercially available 3 mol% Y2O3-stabilised ZrO2 and 8 mol% Y2O3-stabilised ZrO2 powders were used. Compositions with varying amounts of these powders were prepared.
3：List of Experimental Equipment and Materials
Spark plasma sintering furnace (Type HP D25/1, FCT Systeme), hot isostatic press (Bodycote HIP Ltd.), X-ray diffractometer (XRD, Seifert), scanning electron microscopy (Nova NanoSEM 450, FEI), Vickers indentation (Model FV-700, Future-Tech Corp.), spectrophotometer (SolidSpec-3700DUV, Shimadzu Co. Ltd.).
4：Experimental Procedures and Operational Workflow
Powders were mixed, dried, sieved, and sintered by SPS at 1100°C under 200 MPa. Some samples were then HIPed at 1100°C in argon. Samples were annealed in air to remove color centers.
5：Data Analysis Methods
Density was measured by Archimedes’ method. XRD, SEM, and EBSD were used for phase and microstructure analysis. Fracture toughness was calculated from Vickers indentation. Total forward transmission was measured with a spectrophotometer.
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