Conference contribution
(Original article)


Enforcing of Mechanical Properties of Alumina Foams


Publication Details
Author(s): Zierath B, Greil P, Stumpf M, Fey T
Editor(s): John Wiley & Sons, Inc.
Publication year: 2017
Conference Proceedings Title: Advances in Ceramic Armor, Bioceramics, and Porous Materials: Ceramic Engineering and Science Proceedings Volume 37, Issue 4
Pages range: 149-162
ISBN: 9781119321682

Event details
Event: 40th International Conference and Expo on Advanced Ceramics and Composites
Event location: Daytona Beach
Start date of the event: 24/01/2016
End date of the event: 29/01/2016
Language: English

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.



How to cite
APA: Zierath, B., Greil, P., Stumpf, M., & Fey, T. (2017). Enforcing of Mechanical Properties of Alumina Foams. In John Wiley & Sons, Inc. (Eds.), Advances in Ceramic Armor, Bioceramics, and Porous Materials: Ceramic Engineering and Science Proceedings Volume 37, Issue 4 (pp. 149-162). Daytona Beach, US.

MLA: Zierath, Bodo, et al. "Enforcing of Mechanical Properties of Alumina Foams." Proceedings of the 40th International Conference and Expo on Advanced Ceramics and Composites, Daytona Beach Ed. John Wiley & Sons, Inc., 2017. 149-162.

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