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Materials and Manufacturing Processes Volume 22, 2007 - Issue 2
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SPECIAL ISSUE

Effects of Na2O on the Thermal Shock Resistance of Aluminosilicate Refractory Ceramics

W. O. Soboyejo Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USACorrespondence[email protected]
,
E. T. Akpan Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USA
,
I. B. Bashir Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USA
,
J. Zimba Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USA
,
N. Hosannah Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USA
&
S. Allameh Department of Mechanical and Aerospace Engineering, The Princeton Materials Institute, Princeton University, Princeton, New Jersey, USA
Pages 180-186 | Received 20 Nov 2005, Accepted 12 Dec 2005, Published online: 14 Feb 2007
 
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Abstract

This report presents the results of an experimental study of the effects of Na2O on the thermal shock resistance (number of cold shock cycles to failure) of aluminosilicate refractory ceramics. The addition of 4–6% mole is shown to improve the thermal shock resistance, which is characterized by the number of shock cycles to failure. The Na2O changes the viscosity-temperature characteristics, and the glass transition temperatures in ways that enhance the crack-tip shielding due to viscoelastic/grain bridging mechanisms. The improved thermal shock resistance is attributed to the shielding effects of viscoelastic crack bridging by glassy phases between mullite platelets

ACKNOWLEDGMENTS

The research is funded by the Corus Research and Development and the National Science Foundation. Appreciation is extended to the Program Managers at Corus (Erik Damhoff and Flemming Anderson) for their encouragement and support. The authors would also like to thank the NSF Program Managers (Ms. Pat Tsuchitani, Ms. Alice Leeds and Dr. Carmen Huber) for their support of the International Materials Institute at Princeton University. Finally the authors also thank Dr. Chris Mercer for useful technical discussions.

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