Modeling constrained sintering of bi-layered tubular structures. Issue 3 (March 2015)

• Record Type: Journal Article
• Authors: Molla, Tesfaye Tadesse; Ramachandran, Dhavanesan Kothanda; Ni, De Wei; Esposito, Vincenzo; Teocoli, Francesca; Olevsky, Eugene; Bjørk, Rasmus; Pryds, Nini; Kaiser, Andreas; Frandsen, Henrik Lund
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 3(2015:Mar.)
• Page Start: 941
• Page End: 950
• Publication Date: 2015-03
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2014.10.010
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">Constrained sintering of tubular bi-layered structures is being used in the development of various technologies. Densification mismatch between the layers making the tubular bi-layer can generate stresses, which may create processing defects. An analytical model is presented to describe the densification and stress developments during sintering of tubular bi-layered samples. The correspondence between linear elastic and linear viscous theories is used as a basis for derivation of the model. The developed model is first verified by finite element simulation for sintering of tubular bi-layer system. Furthermore, the model is validated using densification results from sintering of bi-layered tubular ceramic oxygen membrane based on porous MgO and Ce_0.9Gd_0.1O_{1.95−<italic>d</italic>} layers. Model input parameters, such as the shrinkage kinetics and viscous parameters are obtained experimentally using optical dilatometry and thermo-mechanical analysis. Results from the analytical model are found to agree well with finite element simulations as well as measurements from sintering experiment.</p> </sec> </abstract>