Structure and properties of polymer-derived SiCN ceramics

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Xuqin Li, Yiguang Wang and Linan An

Accepted Abstracts: J Material Sci

Abstract :

Polymer-derived ceramics (PDCs) are a new class of ceramics synthesized by thermal decomposition of polymeric precursors. Unlike conventional ceramics prepared by sintering the corresponding powders or amorphous film prepared by various physical /chemical depositions, PDCs possess unique structure, which can be described as nanodomain structures. This unique structure confers many unusual and superior properties to the materials, including excellent high-temperature stability and unique electric properties. The materials are very promising for widespread high-temperature applications. Fundamental understanding of the structure and its evolution, as well as structure-property relationship of the materials is therefore both fundamentally and practically interesting. In this paper, the structure of a polymer-derived amorphous silicon carbonitride (SiCN) ceramic was investigated by using NMR, EPR and Raman. The structural evolution of the material as a function of the pyrolysis temperature was also studied. A thermodynamic model was proposed to account for the structural evolution. We also investigated the electric behavior of the material. The structural mechanism was proposed and discussed.

Biography :

Xuqin Li is currently a Ph.D. student in School of Materials Science and Engineering, Northwestern Polytechnical University. Her research is focused on fundamentally studying the structure, structural evolution and property-structure relationship of polymer-derived amorphous ceramics.