Enforcing of Mechanical Properties of Alumina Foams

Zierath B, Greil P, Stumpf M, Fey T (2017)

Publication Language: English

Publication Type: Book chapter / Article in edited volumes

Publication year: 2017

Publisher: John Wiley & Sons, Inc.

Edited Volumes: Advances in Ceramic Armor, Bioceramics, and Porous Materials

Series: Ceramic Engineering and Science Proceedings

Book Volume: 37

Pages Range: 149-162

Conference Proceedings Title: Advances in Ceramic Armor, Bioceramics, and Porous Materials: Ceramic Engineering and Science Proceedings Volume 37, Issue 4

Event location: Daytona Beach US

ISBN: 9781119321682

DOI: 10.1002/9781119321682.ch16

Abstract

This chapter examines compression strength enhancement through residual stresses caused by a different coefficient of thermal expansion. The sintering shrinkage and thermal expansion coefficient where determined by the analysis of bending bars which were produced by slip casting. Due to high sintering temperatures, the alumina foam may suffer from grain growth and decreasing of mechanical properties is expected. MgO was not used as sintering additive for alumina due to fact that it causes grain growth of the mullite, promotes the formation of additional unwanted phases and could change the coefficient of thermal expansion. The increase of the mechanical strength and the behaviour of the different pore size caused by two effects. The intended reason is the formation of a mullite layer on the outside of the alumina struts. The increase of more than 170% in compression strength shows the big influence of the induced residual stress. The increase in mechanical strength realized by coating of sintered alumina foams by silica Stober particles from a TEOS solution. This silica reacts during a second sintering step with the alumina to mullite, which induces residual stresses on the surface of the struts.

Authors with CRIS profile

Bodo Zierath Lehrstuhl für Glas und Keramik (WW3) Peter Greil Lehrstuhl für Glas und Keramik (WW3) Martin Stumpf Lehrstuhl für Glas und Keramik (WW3) Tobias Fey Lehrstuhl für Glas und Keramik (WW3)

How to cite

APA:

Zierath, B., Greil, P., Stumpf, M., & Fey, T. (2017). Enforcing of Mechanical Properties of Alumina Foams. In J. C. LaSalvia, R. Narayan, P. Colombo, M. Fukushima and A. Gyekenyesi (Eds.), Advances in Ceramic Armor, Bioceramics, and Porous Materials. (pp. 149-162). John Wiley & Sons, Inc..

MLA:

Zierath, Bodo, et al. "Enforcing of Mechanical Properties of Alumina Foams." Advances in Ceramic Armor, Bioceramics, and Porous Materials. Ed. J. C. LaSalvia, R. Narayan, P. Colombo, M. Fukushima and A. Gyekenyesi, John Wiley & Sons, Inc., 2017. 149-162.

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