科研之友
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摘要
A novel SiC precursor, A-PMS, was synthesized through a reaction of polymethylsilane (PMS) with SbCl3, where the Si-H in PMS reacts with Sb-Cl to form Si-Sb bond with HCl evaporated. A-PMS was used as a precursor to prepare C-f/SiC ceramic matrix composites (CMCs) via polymer infiltration and pyrolysis (PIP) process. It is evident that SbCl3 plays a very important role in promoting chain crosslinking, transforming of the Si-Si into Si-C bonds and stabilizing PMS from very high oxidation trend of the active Si-H bonds. A-PMS keeps liquid at room temperature that is suitable for the in. ltration in the absence of any solvent. A-PMS can be cured into a fully crosslinked structure at 320 degrees C that leads to a very high ceramic yield up to 91% and an Si/C ratio near 1.12 after pyrolysis. The resulted CMCs samples reached a density of 1.76 g cm(-3) and a flexural strength of 381 MPa after only four in. ltration-pyrolysis cycles.
- 出版日期2008-3-15
- 单位中国人民解放军国防科学技术大学
