A 3dimensional silica fiber fabric reinforced silicon nitride composite was prepared by the polymer impregnation pyrolysis method using a preceramic polymer named perhydropolysilazane (PHPS) with the main backbone \_ n as precursor.

Technique of joining of C_f/SiC composite via preceramic silicone polysilazane and joining properties;

Preparation of SiO_2-containing coatings of polysilazane via UV-curing;

Study on crosslinking of polycarbosilane/polysilazane precursor system;

When methylchlorosilanes and phenylchlorosilane were ammonolyzed with ammonia gas, various polysilazanes were produced which could be typically pyrolyzed at high temperature and subsequently ground into Si-C-N ceramic powders.

Polysilazanes can be used as precursors to prepare silicon\|nitride ceramics by pyrolysis.

The pyrolytic process of three kinds of preceramic polymers,polysilazane(PSZ),polysiloxane(PSO) and polycarbosilane(PCS),were investigeted.

Performance of polyborosilazane and SiBNC ceramics thereof;

Characterization and Rheological Property of Polyborosilazane

New preceramic polymers-hybrid polyborosilazanes(H-PBSZ)were synthesized and char- acterized.