Effects of Reduction Treatment on Fracture Properties of Cerium Oxide

The reduction treatment effects on the flexural strength and the fracture toughness of ceria were evaluated at room temperature. The results reveal that the flexural strength decreases significantly after reduction under very low oxygen partial pressures; however, in contrast, fracture toughness is...

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Bibliographic Details
Published in:	Journal of the American Ceramic Society Vol. 90; no. 12; pp. 3908 - 3914
Main Authors:	Wang, Yanli, Duncan, Keith L., Wachsman, Eric D., Ebrahimi, Fereshteh
Format:	Journal Article
Language:	English
Published:	Malden, USA Blackwell Publishing Inc 01-12-2007 Blackwell Wiley Subscription Services, Inc
Subjects:	Applied sciences Building materials. Ceramics. Glasses Ceramic industries Ceramics Chemical industry and chemicals Cooling Effects Exact sciences and technology Miscellaneous Oxygen Technical ceramics Temperature Cerium Oxides Scanning electron microscopy Mechanical properties Fracture Experimental study X ray diffraction Oxide ceramics Fracture toughness Chemical reduction Bending strength Pressure effect Partial pressure Chemical treatment Low pressure Technical ceramics Oxygen pressure Room temperature
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Summary:	The reduction treatment effects on the flexural strength and the fracture toughness of ceria were evaluated at room temperature. The results reveal that the flexural strength decreases significantly after reduction under very low oxygen partial pressures; however, in contrast, fracture toughness is increased by 30%–40% when the oxygen partial pressure was decreased to 10−20–10−22 atm range. The large microcracks and the surface tensile stresses developed upon reduction treatment and cooling process are responsible for the decreased strength. The enhancement in toughness is also discussed in terms of internal stresses, microcrack toughening, and crack deflection mechanisms.
Bibliography:	ark:/67375/WNG-WJDKW555-C istex:D35CCBE7AB965BDC5823C8FA8C27DF5B4469294F ArticleID:JACE01994 T. Parthasarathy—contributing editor This work was supported by the U.S. Department of Energy through the SECA program, Contract #DE‐FC26‐02NT41562 and the DOE High Temperature Electrochemistry Center at UF, Contract #DE‐AC05‐76RL01830. Based in part on the thesis submitted by Y. Wang for the Ph.D. degree in Materials Science and Engineering, University of Florida, Gainesville, FL 2006. Presented at the 208th Meeting of The Electrochemical Society, Los Angeles, CA, October 17, 2005 (Solid‐State Ionic Devices IV Division, Paper No. Q1‐1039) and 31st International Cocoa Beach Conference and Exposition on Advanced Ceramics and Composites, Daytona Beach, FL, January 26, 2007 (Mechanical Behavior Division, Paper No. S3‐132‐2007). ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0002-7820 1551-2916
DOI:	10.1111/j.1551-2916.2007.01994.x