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首页> 外文期刊>journal of the korean ceramic society >Influences of nano-3Y-TZP reinforcement on phase transformation and crystallite size modification of zirconia-toughened alumina and Rietveld refinement of crystallographic data
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Influences of nano-3Y-TZP reinforcement on phase transformation and crystallite size modification of zirconia-toughened alumina and Rietveld refinement of crystallographic data

机译：Influences of nano-3Y-TZP reinforcement on phase transformation and crystallite size modification of zirconia-toughened alumina and Rietveld refinement of crystallographic data

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摘要

The effects of varying amount of nano-3 mol% yttria-stabilized zirconia addition on the crystal structures, mechanical, and microstructural properties of zirconia-toughened alumina (ZTA) composite have been investigated in this work. The ZTA specimens were prepared by different 3Y-TZP amount ranging from 9 to 18 wt.% and sintered at 1550 & DEG;C for 2 h. The densification behaviour, indentation fracture toughness, microhardness, elastic modulus, flexural strength and surface morphology of the composites have been determined and correlated with tetragonal & RARR; monoclinic phase transformation and retention of tetragonal phase. Rietveld refinement of the crystallographic data was performed to correlate the effect of zirconia addition on the phase compositions, t & RARR; m transformability and impacts on crystallite sizes and lattice parameter. The toughness and flexural strength of the composites improved significantly up to 15 wt.% YSZ addition followed by a reduction for 18 wt.%, while the hardness and elastic modulus decreased with YSZ addition. Rietveld refinement ascertains the metastable t-ZrO2 retention and thermodynamically stable m-ZrO2 transformation with increasing 3Y-TZP and subsequent enhancement in fracture toughness through transformation toughening.

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