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Polyborosilazanes with Controllable B/N Ratio for Si-B-C-N Ceramics.

Yanpei DangTianhao LiYangzhong ZhaoLiantai DuanJianning ZhangKe ChenLiu HeQing HuangChuanzhuang ZhaoYujie Song
Published in: Materials (Basel, Switzerland) (2023)
Polyborosilazanes with controllable B/N ratio were synthesized using high-boron-content m -carborane, dichloromethylsilane, and hexamethydisilazane. After high-temperature pyrolysis, Si-B-C-N quaternary ceramics with SiC and B 4 C as the main phases were obtained. The B/N ratio in the precursors corresponded to the change in the feeding ratio of carborane and dichloromethylsilane. The effects of boron content and B/N ratio on the ceramic precursors and microphase structure in Si-B-C-N quaternary ceramics were explored in detail through a series of analytical characterization methods. A high boron content results in a significant increase in the ceramic yield (up to 71 wt%) of polyborosilazanes, and at the same time, the B/N molar ratio was regulated from 28.4:1 to 1.62:1. The appearance of the B 4 C structure in the Si-B-C-N quaternary ceramics through the regulation of the B/N ratio, has rarely been reported.
Keyphrases
  • room temperature
  • transcription factor
  • mass spectrometry