The role of light rare earths in the thermal degradation behaviour of ZrO2-CeO2-Y2O3 ceramics

被引：0

作者：

Menezes, Cristiane A.B. ^{[1
]}

Lazar, Dolores R.R. ^{[1
]}

Ussui, Valter ^{[1
]}

Lima, Nelson B. ^{[1
]}

Octavio, Josá ^{[1
]}

Paschoal, A. ^{[1
]}

机构：

[1] IPEN, Inst. Pesq. Energeticas e Nucleares, Cidade Universitária, Travessa R, 400, 05508-900 São Paulo, Brazil

来源：

Materials Science Forum | 2003年 / 416-418卷 / 01期

关键词：

Aging of materials - Cerium compounds - Composition effects - Density (specific gravity) - Grain size and shape - Low temperature effects - Pyrolysis - Rare earths - Scanning electron microscopy - X ray diffraction analysis - Yttrium compounds - Zirconia;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The objective of this paper is to evaluate the light rare earth influence on hydrothermal ageing behaviour of ZrO2-CeO2-Y2O3 ceramics at low temperatures (200 - 300°C). With this purpose zirconia samples doped with 2 mol% of yttria and 10 mol% of light rare earth oxides were prepared using light rare earth concentrates. Powders were synthesized by the coprecipitation route. Apparent density values were determined by Archimedes method. The sintered pellets were characterized, before and after the ageing tests at 250°C for 100 hours, by X - ray diffraction (Rietveld refinement), Vickers indentation technique, scanning electron microscopy and grain size determination. Results indicate that light rare earth presence has no significant effect on ZrO2 - CeO2 - Y2O3 ceramics performance. It was verified that the high purity oxides, that present high costs, are not required to obtain zirconia ceramics with better properties.

引用

页码：573 / 578