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Design of localized quantum structures in high temperature ceramics

高温陶瓷中的局域量子结构设计

基本信息

批准号：
13305052
负责人：
SAKUMA Taketo
金额：
$ 32.03万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13305052/
关键词：
Ceramics GB Quantum structure Superplasticity Dopant First principle calculation High temperature deformation Zirconia Alumina セラミック

项目摘要

This study aims to design localized quantum structures suitable for improving mechanical properties of structural ceramics for high-temperature use. For this purpose, we investigated the effects of a small amount of dopants on mechanical properties in structural ceramics. Samples were prepared by ordinary sintering methods. As for doping, we tried to dope several kinds of ions at a level of a few one-tenth mol % using solutions including ions. In order to reveal such effects due to doping, we combined microstructual analysis at an atomic scale and mechanical properties testing. As for microstructual analysis, high resolution electron transmission microscopy (HRTEM), energy dispersive spectroscopy(EDS) and electron energy loss spectroscopy(EELS) were carried out. It was found that the dopant effect is very sensitive to mechanical properties. In particular, by doping different ions simultaneaouly, elongation at high-temperature was largely increased up to 1000% in ZrO2-based superplastic material. Such co-doping effect was confirmed to occur even at a level of 0.1mol%. This result is the first one in the field of superplastic materials. The co-doping effects could be confirmed to be due to a change of electronic structure localized at grain boundaries, which is caused by a small amount of dopants.

本研究旨在设计适用于改善高温结构陶瓷力学性能的局域量子结构。为此，我们研究了少量掺杂剂对结构陶瓷力学性能的影响。样品通过普通烧结方法制备。至于掺杂，我们尝试使用包含离子的溶液以几个十分之一摩尔%的水平掺杂几种离子。为了揭示这种影响，由于掺杂，我们结合微观结构分析在原子尺度和机械性能测试。在微观结构分析方面，采用了高分辨电子透射显微镜（HRTEM）、能量色散谱（EDS）和电子能量损失谱（EELS）。结果发现，掺杂剂的效果是非常敏感的机械性能。特别是通过不同离子的均匀掺杂，使ZrO2基超塑性材料的高温延伸率大幅度提高，最高可达1000%。这种共掺杂效应被证实甚至在0.1mol%的水平下也发生。这一结果在超塑性材料领域尚属首次。这种共掺杂效应是由于少量掺杂引起的晶界电子结构的变化。