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Characterization of free carbon in the as-thermolyzed Si-B-C-N ceramic from a polyorganoborosilazane precursor

Journal of Advanced Ceramics 2013年第4期2卷 325-332页

作者： Adhimoolam Bakthavachalam KOUSAALYA Ravi KUMARa Shanmugam PACKIRISAMY Materials Processing Section Department of Metallurgical and Materials EngineeringIndian Institute of Technology MadrasChennai 600036Tamil NaduIndia Analytical Spectroscopy and Ceramics Group PCM EntityVikram Sarabhai Space CentreThiruvananthapuram 695022India

Polyorganoborosilazane((B[C_(2)H_(4)-Si(CH_(3))NH]_(3))n)was synthesized via monomer route from a single-source precursor and thermolyzed at 1300℃in argon *** as-thermolyzed Si-B-C-N ceramic was characterized using X-ray diffraction(XRD)and Raman *** crystallization behavior of silicon carbide in the as-thermolyzed amorphous Si-B-C-N matrix was understood by XRD studies,and the crystallite size calculated using Scherrer equation was found to increase from 2 nm to 8 nm with increase in dwelling ***,Raman spectroscopy was used to characterize the free carbon present in the as-thermolyzed *** peak positions,intensities and full width at half maximum(FWHM)of D and G bands in the Raman spectra were used to study and understand the structural disorder of the free *** G peak shift towards 1600 cm-1 indicated the decrease in cluster size of the free *** cluster diameter of the free carbon calculated using TK(Tuinstra and Koenl)equation was found to decrease from 6.2 nm to 5.4 nm with increase in dwelling time,indicating increase in structural disorder.

关键词： synthesis polyorganoborosilazane precursor-derived ceramic Si-B-C-N Raman spectroscopy free carbon

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Formation of nanocrystalline graphite in polymer-derived SiCN by polymer infiltration and pyrolysis at a low temperature

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Journal of Advanced Ceramics 2021年第6期10卷 1256-1272页

作者： Mingxing LI Laifei CHENG Fang YE Conglin ZHANG Jie ZHOU Science and Technology on Thermostructural Composite Materials Laboratory Northwestern Poly technical UniversityXi'an 710072China

The microstructure of polymer-derived ceramics(PDCs)was closely related to *** study demonstrated that SiCN matrix prepared by polymer infiltration and pyrolysis(PIP)at 900℃ inside a Si_(3)N_(4) whisker(Si_(3)N_(4w))preform with submicro-sized pores differed from its powder-consolidated analogue in both the content and structure of free *** analysis showed that PIP process had a higher free carbon *** spectroscopy and transmission electron microscopy(TEM)observation discovered a higher graphitization degree of free carbon and the existence of nanocrystalline graphite in SiCN *** properties of Si_(3)N_(4w)/SiCN composites were greatly enhanced when volume fraction of SiCN matrix reached 24.5%due to dielectric percolation caused by highly-lossy free *** of hydrocarbon released during pyrolysis by gas-state carbonization in Si_(3)N_(4) whisker preform was supposed to account for the high yield and graphitization degree of free carbon in PIP process.

关键词： polymer-derived ceramics(PDCs) silicon carbonitride(SiCN) free carbon carbonization dielectric property

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