Ceramization of Hybrid Polyborosilazanes

doi:10.3724/SP.J.1077.2008.00229

Abstract

Abstract: New preceramic polymers-hybrid polyborosilazanes (H-PBSZ) were synthesized and characterized. The ceramization process of H-PBSZ was investigated by TGA, FT-IR, XRD and SEM. The results show that there exist bonds of B-N, Si-N, B-H, N-H, Si-H in the structures of H-PBSZ. With the increase of pyrolysis temperature, the bonds contained H atoms decrease till they disappear. The ultimate product is a mixture comprised of BN and Si₃N₄ . The loss of weight in the process of pyrolysis mainly occurs between 100℃ and 400℃, and the ceramic yield is about 83wt％. The pyrolytic product is crystallized as the temperature increases. The products pyrolyzed at 800℃ are almost amorphous with mainly spherical particles, while those pyrolyzed at 1600℃ are well crystallized, and h-BN crystal flakes and α-Si₃N₄ grains can be observed by SEM.

Key words: polyborosilazane, pyrolysis, ceramization, boron nitride

CLC Number:

TQ263
TQ264

LI Bin,ZHANG Chang-Rui,CAO Feng,WANG Si-Qing,JIANG Yong-Gang. Ceramization of Hybrid Polyborosilazanes[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00229.

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