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Effects of pressureless two-step sintering on the densification and properties of tetragonal zirconia

R.S.K. Singh|K.Y. Sara Lee|H.C. Alexander Chee
청정에너지연구소 (Clean-Energy Research Institute)|2021.06|Journal of Ceramic Processing Research|제22권 제3호|pp. 289-295|DOI 10.36410/jcpr.2021.22.3.289

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참고문헌

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mechanical propertieszirconiaY-TZPtwo-step sintering (TSS)single-step sintering (SSS)
주제분류재료공학

초록

The effects of pressureless two-step sintering (TSS) on the densification and mechanical properties of tetragonal zirconiapolycrystals were investigated and compared with that obtained by conventional single-step sintering (SSS). The TSS profileinvolved firing at a high temperature, T1 of 1450 oC followed by cooling to a lower temperature, T2 of 1250 oC and soakingfor various holding time ranging from 2 h to 10 h. The results showed that the tetragonal phase stability was not disruptedby TSS. A high relative density, above 96%, was obtained for the TSS samples regardless of holding time when compared toSSS which exhibited about 99% of theoretical density when sintered at 1450 oC. Nonetheless, the beneficial effects of TSS inenhancing the Vickers hardness and fracture toughness of tetragonal zirconia when compared to SSS, without incurring graingrowth have been revealed. The single-step sintering yielded large tetragonal grains, about 0.56 μm, if compared TSS whichexhibited a refine microstructure having grain sizes ranging from 0.27 μm (for 2 h holding time) to 0.35 μm (for 10 h holdingtime). This feature of TSS which allows for the inhibition of grain boundary migration and the activation of grain boundarydiffusion at lower dwelling temperature during sintering were responsible for the enhancement of the mechanical propertiesof tetragonal zirconia.

Abstract

The effects of pressureless two-step sintering (TSS) on the densification and mechanical properties of tetragonal zirconiapolycrystals were investigated and compared with that obtained by conventional single-step sintering (SSS). The TSS profileinvolved firing at a high temperature, T1 of 1450 oC followed by cooling to a lower temperature, T2 of 1250 oC and soakingfor various holding time ranging from 2 h to 10 h. The results showed that the tetragonal phase stability was not disruptedby TSS. A high relative density, above 96%, was obtained for the TSS samples regardless of holding time when compared toSSS which exhibited about 99% of theoretical density when sintered at 1450 oC. Nonetheless, the beneficial effects of TSS inenhancing the Vickers hardness and fracture toughness of tetragonal zirconia when compared to SSS, without incurring graingrowth have been revealed. The single-step sintering yielded large tetragonal grains, about 0.56 μm, if compared TSS whichexhibited a refine microstructure having grain sizes ranging from 0.27 μm (for 2 h holding time) to 0.35 μm (for 10 h holdingtime). This feature of TSS which allows for the inhibition of grain boundary migration and the activation of grain boundarydiffusion at lower dwelling temperature during sintering were responsible for the enhancement of the mechanical propertiesof tetragonal zirconia.

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