Polysilacyclobutasilazanes: pre-ceramic polymers for the preparation of sintered silicon carbide monoliths

Burns, Gary T.; Saha, C. K.; Zank, Gregg A.; Freeman, Harvey A.

doi:10.1007/bf01117927

Cited by 6 publications

(2 citation statements)

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“…Traditionally, silicon oxycarbides was used as components of ceramic base composites or binders of ceramics for high‐temperature applications . In a series of early studies, porous Si–O–C ceramics with controlled foam morphologies were successfully sythesized …”

Section: Introductionsupporting

confidence: 76%

“…5,6 Traditionally, silicon oxycarbides was used as components of ceramic base composites or binders of ceramics for hightemperature applications. [7][8][9] In a series of early studies, por-ous Si-O-C ceramics with controlled foam morphologies were successfully sythesized. 10,11 However, the various functional properties of Si-O-C ceramics have recently began to attract attentions.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

et al. 2015

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The dependence of silicon oxycarbides' chemical composition and molecular structure on their reaction conditions was tested by varying the atmosphere under which pyrolysis was performed. To obtain the silicon oxycarbides, densely cross‐linked silicone resin particles with an averaged diameter of 2 μm were pyrolyzed in various atmospheres of H2, Ar, and CO2, in the temperature range 700°C–1100°C. The residual mass of resin after pyrolysis was almost constant at 700°C, although their apparent colors varied distinctly. The sample obtained from the H2 atmosphere was white, whereas that obtained from the CO2 atmosphere was dark brown. Fourier‐transform infrared (FT‐IR) spectra of the residues suggested that the Si–O–Si network evolution was accelerated in the CO2 atmosphere. Beyond 800°C, the chemical compositions of the compounds obtained from a H2 atmosphere increasingly approached near‐stoichiometric SiO2–xSiC composition with increasing the pyrolysis temperature. Compounds from a CO2 atmosphere approached a composition of SiO2–xC with no free SiC as the pyrolysis temperature increased. In the products from an Ar atmosphere, SiO2–xSiC–yC compositions were typically obtained. The observed effects of the pyrolysis atmosphere on the resulting chemical compositions were analyzed in terms of thermodynamic calculations. Electron spin resonance (ESR) spectra revealed broad and intense signals from products obtained from either Ar or CO2. Estimating from the signal intensity, the residual spin concentrations were in the range 1018–1019 g−1. Meanwhile, the spectra from the samples obtained in H2 showed weak and sharp signals with estimated spin concentrations ranging from 1016–1017 g−1. This signal attenuation may have been due to the hydrogen capping of dangling bond formed during pyrolysis.

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Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

et al. 2015

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Si‐Containing Ceramic Precursors

Laine

Sellinger

2009

Patai's Chemistry of Functional Groups

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Introduction Criteria that Define a Useful Precursor Precursors Containing Si and N Precursors Containing Si and C Precursors to Si  O Containing Materials

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Precursor‐derived Covalent Ceramics*

1995

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The preparation of ceramic materials from preceramic compounds provides a means for the synthesis of new materials which cannot be obtained by conventional methods. An example is shown in the figure, which shows carbon‐fiber‐reinforced silicon carbide coated with silicon carbonitride prepared by dip‐coating the substrate with a slurry made of polyhydridomethylsilazane and silicon powder. Progress and applicational examples are reviewed magnified image.

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Polysilacyclobutasilazanes: pre-ceramic polymers for the preparation of sintered silicon carbide monoliths

Cited by 6 publications

References 12 publications

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

Effects of Atmospheric Composition on the Molecular Structure of Synthesized Silicon Oxycarbides

Si‐Containing Ceramic Precursors

Precursor‐derived Covalent Ceramics*

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