Thermal behavior of (organosilicon) polymer-derived ceramics. V: Main facts and trends

Monthioux, Marc; Delverdier, O.

doi:10.1016/0955-2219(95)00186-7

Cited by 161 publications

(123 citation statements)

References 21 publications

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“…12) Dehydrogenation and edge-to-edge-linkage of neighboring PAHs lead to the formation of larger graphitic clusters within the silicon oxycarbide matrix.…”

Section: Introductionmentioning

confidence: 99%

UV Raman spectroscopy of segregated carbon in silicon oxycarbides

Roth

Waleska

Heß

et al. 2016

J. Ceram. Soc. Japan

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Polymer-derived silicon oxycarbides exhibiting¯1 and 10 vol.% of segregated carbon finely dispersed within a glassy Si x O y C z matrix have been investigated by UV Raman spectroscopy using a laser excitation of 4.8 eV ( = 256.7 nm). Carbon exists as amorphous sp 2 sp 3 bonded component in SiOC/C (¯1 vol.%) pyrolyzed at 1100°C in H 2 , including CC single bonds, polymeric chains and small polycyclic aromatic hydrocarbons (PAHs). The formation of nanocrystalline carbon at T > 1400°C is seen in the Raman spectra of SiOC/C (¯1 vol.%) and SiOC/C (10 vol.%) by the appearance of the G band of graphite. Tempering at 1600°C increases the degree of order within the carbon phase. However, the slight narrowing of the G peak with processing temperature (by about 5%) indicates still not well-crystallized carbon: the Raman results can be best explained by turbostratic carbon (with a lateral size L a of µ2 nm) and do not support the model description in literature as a network of single layer graphene.

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“…12) Dehydrogenation and edge-to-edge-linkage of neighboring PAHs lead to the formation of larger graphitic clusters within the silicon oxycarbide matrix.…”

Section: Introductionmentioning

confidence: 99%

UV Raman spectroscopy of segregated carbon in silicon oxycarbides

Roth

Waleska

Heß

et al. 2016

J. Ceram. Soc. Japan

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“…1 nm and are stacked as plates with turbostratic order. [25] The graphitic regions increase in concentration above 1400 8C and their presence strongly influences the observed reduction in electrical resistivity. Sintering at 1500 8C commences the graphitization process, whereas at 1600 8C the lowest measured resistivity values indicate full graphitization.…”

mentioning

confidence: 97%

“…[24,25] For the purposes of this study, this temperature range is not high enough since the pyrolyzed component remains relatively poorly conducting and adequate densification is not achieved at these temperatures. [22] Optimally, the pyrolyzed carbon has to be transformed to graphite in order to obtain good electrical conductivity.…”

mentioning

confidence: 99%

Electrically Conductive Dense and Porous Alumina with In‐Situ‐Synthesized Nanoscale Carbon Networks

Menchavez¹,

Fuji²,

Takahashi³

2008

Advanced Materials

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“…These polymers, upon controlled pyrolysis, yield ceramic residue through the elimination of organic moieties by breaking of C-H bonds and releasing H 2 , CH 4 or other volatile compounds [22,24,25]. Very complex nanostructures with nanocrystalline phases, unique amorphous phases and a free-carbon phase were obtained using preceramic polymers [26][27][28][29][30][31][32][33]. Polysiloxanes are generally denoted as silicones and are superior in heat and chemical resistance when compared to many other polymers.…”

Section: Introductionmentioning

confidence: 99%

Processing of polysiloxane-derived porous ceramics: a review

Kumar

Kim

2010

Science and Technology of Advanced Materials

112

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Because of the unique combination of their attractive properties, porous ceramics are considered as candidate materials for several engineering applications. The production of porous ceramics from polysiloxane precursors offers advantages in terms of simple processing methodology, low processing cost, and easy control over porosity and other properties of the resultant ceramics. Therefore, considerable research has been conducted to produce various Si(O)C-based ceramics from polysiloxane precursors by employing different processing strategies. The complete potential of these materials can only be achieved when properties are tailored for a specific application, whereas the control over these properties is highly dependent on the processing route. This review deals with processing strategies of polysiloxane-derived porous ceramics. The essential features of processing strategies-replica, sacrificial template, direct foaming and reaction techniques-are explained and the available literature reports are thoroughly reviewed with particular regard to the critical issues that affect pore characteristics. A short note on the cross-linking methods of polysiloxanes is also provided. The potential of each processing strategy on porosity and strength of the resultant SiC or SiOC ceramics is outlined.

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Thermal behavior of (organosilicon) polymer-derived ceramics. V: Main facts and trends

Cited by 161 publications

References 21 publications

UV Raman spectroscopy of segregated carbon in silicon oxycarbides

UV Raman spectroscopy of segregated carbon in silicon oxycarbides

Electrically Conductive Dense and Porous Alumina with In‐Situ‐Synthesized Nanoscale Carbon Networks

Processing of polysiloxane-derived porous ceramics: a review

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