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The Influence of Ceramic Interphases on the Creep Behavior of Silicon Nitride

Published

Author(s)

Sheldon M. Wiederhorn

Abstract

In this paper we discuss the role played by the intergranular phases in the creep of silicon nitride, which is completely controlled by the amount and effective viscosity of the intergranular phases. After briefly reviewing the structure and creep behavior of silicon nitride, we discuss two theories developed to rationalize known facts on the creep behavior of this material. One of the theories is based on grain boundary sliding, the other on cavity formation and the flow of the sintering aid away from the cavitation site. A detailed evaluation of each model with regard to transport properties of the sintering aid supports the cavitation model as the explanation for high temperature creep of silicon nitride.
Citation
Ceramic Interfaces Workshop

Keywords

cavitation, creep, density, granular materials, silicon nitride

Citation

Wiederhorn, S. (2008), The Influence of Ceramic Interphases on the Creep Behavior of Silicon Nitride, Ceramic Interfaces Workshop (Accessed May 22, 2024)

Issues

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Created October 16, 2008