Paper number 1017

MOLECULAR DESIGN OF PRECURSORS AND APPLICATION IN CMCS PREPARATION

Zhaohui Chen, Haifeng Hu, Wenwei Zheng, and Jiayu Xiao

Department of Material Engineering & Applied Chemistry, National University of Defense Technology, Changsha 410073, P.R.China

Summary

In order to satisfy the requirements for preceramic polymers (low viscosity, crosslinkability, and high ceramic yield) aiming to prepare ceramic matrix composites, a series of silazane oligomers were firstly molecularly designed, then synthesized, characterized, and pyrolyzed to obtain ceramic yields. One of the precursors was used to prepare carbon fiber three dimensional braided preform reinforced composite, and maximum flexural strength 425.3MPa and flexural toughness over 11.5 MPa were achieved.

Keywords

molecular design, preceramic polymer, CMCs preparation.