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Field-assisted sintering of multiphase toughening zirconia ceramics

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주제분류재료공학

초록

Field-assisted sintering technology was used to fabricate multiphase zirconia ceramics composed of tetragonal and cubicphases. The composites were based on 3 mol. % yttria tetragonal zirconia polycrystals (3Y-TZP) with the addition of 8.5 mol. % yttria-stabilized zirconia (8.5Y-YSZ). The phase composition of the ceramics was characterized by X-ray diffraction, andthe fracture surface of the bulks was examined by field emission scanning electron microscopy. The phase volume fractionsof the tetragonal and cubic phases in the sintered ceramics were estimated and the mechanical properties of the ceramics wereanalyzed. The multiphase structure and mechanical properties of the ceramics were investigated. The results showed that10 wt. % 8.5YSZ with a yttria content of 3.55 mol. % exhibited the optimal mechanical properties. The maximum fracturetoughness and Vickers hardness were obtained in the ceramic with a tetragonal composition of 99.7 vol. % that was sinteredat 1400°C. These results suggest that the improved mechanical properties of the composites are due to a multiphase effect.

Abstract

Field-assisted sintering technology was used to fabricate multiphase zirconia ceramics composed of tetragonal and cubicphases. The composites were based on 3 mol. % yttria tetragonal zirconia polycrystals (3Y-TZP) with the addition of 8.5 mol. % yttria-stabilized zirconia (8.5Y-YSZ). The phase composition of the ceramics was characterized by X-ray diffraction, andthe fracture surface of the bulks was examined by field emission scanning electron microscopy. The phase volume fractionsof the tetragonal and cubic phases in the sintered ceramics were estimated and the mechanical properties of the ceramics wereanalyzed. The multiphase structure and mechanical properties of the ceramics were investigated. The results showed that10 wt. % 8.5YSZ with a yttria content of 3.55 mol. % exhibited the optimal mechanical properties. The maximum fracturetoughness and Vickers hardness were obtained in the ceramic with a tetragonal composition of 99.7 vol. % that was sinteredat 1400°C. These results suggest that the improved mechanical properties of the composites are due to a multiphase effect.

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