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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Transformation behaviour of tetragonal zirconia: role of dopant content and distribution
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Transformation behaviour of tetragonal zirconia: role of dopant content and distribution

机译：四方氧化锆的转变行为：掺杂剂含量和分布的作用

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摘要

The goal of this paper is to investigate the influence of dopant content and distribution on the thermally induced transformation behaviour of yttria stabilised tetragonal zirconia polycrystals (Y-TZP). A range of TZPs with varying Y_2O_3 content (1.75-3 mol%) was fully densified by hot pressing at 1450℃ for 1 h in vacuum. Thermal length change of the hot pressed TZPs, as measured by the thermo-mechanical analysis (TMA) in air, has been obtained to evaluate the transformation behaviour of the tetragonal zirconia phase. The thermal hysteresis behaviour reveals the nature of the reversible tetragonal (t) to monoclinic (m) transformation and the low temperature degradation phenomenon. Furthermore, the obtained transformation data have been characterised in terms of the grain size, overall yttria content and distribution. While the yttria content remains important, overall yttria distribution has been identified as an additional key microstructural variable influencing the thermally induced transformation behaviour of Y-TZP ceramics. It is demonstrated in our research that the tetragonal zirconia transformation can be tuned by the controlled addition of the Y-free monoclinic zirconia particles to 3 mol% Y-ZrO_2 powders in a simple "mixing route".
机译：本文的目的是研究掺杂剂含量和分布对氧化钇稳定的四方氧化锆多晶体（Y-TZP）的热诱导转变行为的影响。通过在真空中在1450℃下热压1 h，可以使一系列具有不同Y_2O_3含量（1.75-3 mol％）的TZP完全致密。通过热力学分析（TMA）在空气中测得的热压TZP的热长度变化已获得，以评估四方氧化锆相的转变行为。热滞行为揭示了可逆的四边形（t）到单斜晶（m）转变的性质以及低温降解现象。此外，所获得的转变数据已经根据晶粒尺寸，整体氧化钇含量和分布进行了表征。尽管氧化钇含量仍然很重要，但氧化钇的总体分布已被确定为影响Y-TZP陶瓷热诱导相变行为的另一个关键微结构变量。在我们的研究中表明，可以通过在简单的“混合路径”中将无Y单斜晶氧化锆颗粒控制添加到3 mol％Y-ZrO_2粉末中来调节四方氧化锆的转变。

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