The effects of CeO2 addition on the physical, microstructural and mechanical properties of yttria stabilized zirconia toughened alumina (ZTA)

被引：67
作者：
Rejab, Nik Akmar [1 ]
Azhar, Ahmad Zahirani Ahmad [1 ]
Ratnam, Mani Maran [2 ]
Ahmad, Zainal Arifin [1 ]
机构：
[1] Univ Sains Malaysia, Sch Mat & Mineral Resources Engn, Nibong Tebal 14300, Penang, Malaysia
[2] Univ Sains Malaysia, Sch Mech Engn, Nibong Tebal 14300, Penang, Malaysia
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2013年 / 36卷
关键词：
Fracture toughness; CeO2; Grain sizes; Phase transition; Substitutions; SINTERING BEHAVIOR; CERIA; CERAMICS;
D O I：
10.1016/j.ijrmhm.2012.08.010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of CeO2 addition on the structure, microstructure and fracture toughness of yttria stabilized zirconia toughened alumina (ZTA) ceramics were investigated. The CeO2 addition to the powder mixtures was varied from 0 wt.% to 15 wt.%. The powders of each composition were pressed into pellets and sintered at 1600 degrees C for 4 h under pressureless conditions. The fracture toughness of the sintered samples was determined by the Vickers indentation technique with a 30 kgf load. Based on the XRD analysis, only corundum and yttria doped zirconia phases were present. Shift in position of the zirconia peaks were observed due to the CeO2 addition. Microstructure investigations showed that the grain sizes of both corundum and yttria doped zirconia increased with increasing CeO2 addition. Fracture toughness and hardness values were dependent on the CeO2 addition. The highest fracture toughness (8.38 MPa.root m) and hardness (1688 HV) was obtained with the sample with 5 wt.% CeO2 additions. ZTA prepared with CeO2 additives showed an increase of 30% in fracture toughness compared to ZTA without additives. (C) 2012 Elsevier Ltd. All rights reserved.
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页码：162 / 166
页数：5
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