Toughening and strengthening of Nb2O5 doped zirconia/alumina (ZTA) composites

被引：50
|
作者：
Hassan, A. M. [1 ]
Naga, S. M. [2 ]
Awaad, M. [2 ]
机构：
[1] Zagazig Univ, Fac Engn, Dept Mat Engn, Zagazig 44519, Egypt
[2] Natl Res Ctr, Dept Ceram, Cairo 12622, Egypt
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2015年 / 48卷
关键词：
ZTA; Niobia; Microstructure; Mechanical properties; X-RAY-ABSORPTION; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; ALUMINA; MICROSTRUCTURE; YTTRIA; TRANSFORMATION; STABILIZATION; DENSIFICATION; CONDUCTIVITY;
D O I：
10.1016/j.ijrmhm.2014.10.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The aim of this research is to investigate the characteristics and mechanical properties of Nb2O5 doped zirconia-toughened-alumina composites. Samples of partially stabilized-zirconia toughened alumina (ZTA) with the addition of 5 vol.% ZrO2 doped with Nb2O5 in amounts of 0.2, 0.4 and 0.6 vol.% were prepared by sol-gel technique. The powders of each composition were uniaxially pressed into discs and rectangular bars, and then pressureless sintered at 15000 up to 1650 degrees C for 1 h. The phase constitution and microstructures of the as sintered ceramic composites were characterized by using an X-ray diffractometer and a scanning electron microscope respectively. The mechanical properties of the ceramic composites were evaluated through Vickers hardness, flexural strength and fracture toughness tests. It was found that increasing the Nb2O5 concentration had a strong effect on the densification behavior, microstructure and mechanical properties of the ZTA composites. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：338 / 345
页数：8
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