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| Composition and structure of polyborosilazane and ceramics thereof |
| TANG Yun;;;;;; |
| 国防科技大学CFC国防科技重点实验室 |
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Cite this article:
TANG Yun. Composition and structure of polyborosilazane and ceramics thereof. Chin J Mater Res, 2008, 22(3): 291-296.
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Abstract Polyborosilazane (PBSZ), a precursor to SiBNC ceramic, was synthesized via cocondensadition approach using methyldichlorosilane (MeHSiCl2), boron trichloride (BCl3) and hexamethydisilazane (HMDZ) as the starting materials. SiBNC ceramics were obtained when pyrolysising the as-synthesized PBSZ in NH3/N2 atmosphere. The chemical composition, structure and high temperature properties of the obtained polymer and ceramics were investigated using EA, FTIR, NMR, XPS and XRD. The results indicate that the backbone of PBSZ is －Si－N－B－ linkage in the form of borazine and C is in the form of Si－CH3. The ceramic yield of the PBSZ at 1000 ℃ in NH3/N2 atmosphere is 61％. The products have low carbon content (<0.5％)and show excellent high temperature stability. They are fully amorphous after heated to 1700 ℃ and result in partially crystallized Si3N4、BN、SiC phases when heated to 1850 ℃.The weight loss of SiBNC ceramics at 1500 ℃～1850 ℃ is about 10％.
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Received: 28 June 2007
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