Paper number 1039

PREPARATION OF SIC ABSORBENT BY PYROLYZING POLYCARBOSILANE MIXED WITH NANO-CO (NI) POWDER

Cheng Haifeng, Chen Zhaohui, Li Yongqing, and Zhang Changrui

Department of Material Engineering and Applied Chemistry,
National University of Defense Technology, Changsha, Hunan, 410073, PRC

Summary

Modified SiC absorbent was prepared by pyrolyzing polycarbosilane (PCS) mixed with nano-Co(Ni) powder. The pyrolyzation behavior was investigated, and the reaction of nano-Co(Ni) powder with the pyrolyzation product of PCS was proved by TG and IR analysis. The composition of the pyrolyzed and heat-treated product was identified by means of XRD analysis, Co(Ni) silicides were proved to be the primary component that derived from metal powder. The influence of the content of the nano-metal powder in raw mixture and the heat-treatment temperature on the permittivity and permeability of the modified SiC absorbent was studied, and the electromagnetic parameters of the pyrolyzation product could be adjusted in a rather wide range so that it could act as microwave absorbent to fulfill different requirement.

Keywords

nano-Co(Ni) powder, pyrolyzation, PCS, permittivity, permeability.