The capability of hibonite elongated grains to influence physical, microstructural, and mechanical properties of zirconia toughened alumina–CeO2–MgO ceramics

This work investigated the capability of hibonite (CaAl12O19) phase on structure and microstructure of zirconia toughened alumina–CeO2–MgO ceramics. Three different additives (CeO2, MgO and CaCO3) were introduced into zirconia toughened alumina ceramics prepared by solid state reaction. X-ray diffra...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2016-08, Vol.58, p.104-109
Main Authors: Rejab, Nik Akmar, Sktani, Zhwan Dilshad Ibrahim, Dar, Tan Yong, Wan Ali, Wan Fahmin Faiz, Jamaludin, Abdul Rashid, Ahmad, Zainal Arifin
Format: Article
Language:English
Subjects:
CaCO3
Calcium carbonate
Ceramics
Diamond pyramid hardness
Diffraction
Elongation
Fracture toughness
Grains
Hibonite
Microstructure
Phase transition
Vickers hardness
Zirconia toughened alumina
Zirconium dioxide
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Summary:This work investigated the capability of hibonite (CaAl12O19) phase on structure and microstructure of zirconia toughened alumina–CeO2–MgO ceramics. Three different additives (CeO2, MgO and CaCO3) were introduced into zirconia toughened alumina ceramics prepared by solid state reaction. X-ray diffraction and FESEM analyses were employed to observe the role of secondary phases especially hibonite and its influence on the microstructural features and other properties. Among the secondary phases present, EDX analysis revealed that hibonite phase contributed to elongated grains. Vickers indentations hinted a strong difference in the efficiency of compositional adjustment among the composites. The excellent Vickers hardness and fracture toughness results obtained for 3wt.% CaCO3 additions showed the appearance of 5.9% hibonite with the value of 1485HV and 7.10MPa·√m, respectively. •A study on effect of physical and microstructural modification of ZTA added with CeO2, MgO and CaCO3 to mechanical properties•Hibonite capability to influence physical, microstructural and mechanical properties of ZTA-CeO2-MgO ceramics was studied•The amount of hibonite phase (represented by elongated grains) was adjusted via addition of various amount of CaCO3•These additives combination managed to stabilize and improve mechanical properties of ZTA-CeO2-MgO ceramics
ISSN:0263-4368
2213-3917
DOI:10.1016/j.ijrmhm.2016.04.008