Phase Separation in an SiCO Glass Studied by Transmission Electron Microscopy and Electron Energy‐Loss Spectroscopy

Kleebe, Hans‐Joachim; Turquat, Ch.; Sorarù, Gian Domenico

doi:10.1111/j.1151-2916.2001.tb00792.x

Cited by 152 publications

(128 citation statements)

References 20 publications

(24 reference statements)

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“…It is known that amorphous SiOC glasses are not stable at high temperatures and at temperatures of > 1000 °C-1200 °C, they will undergo a phase separation process, resulting in the formation of SiC nanocrystals and amorphous SiO 2 , accompanied by the release of SiO and CO gases [15]. The phase separation process can be described roughly by the following equation (1) [16].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SiC nanowires via catalyst-free pyrolysis of silicon-containing carbon materials derived from a hybrid precursor

Dong

Meng

Zhu

et al. 2017

Ceramics International

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SiC nanowires were successfully synthesized without catalyst by pyrolysis of silicon-containing pitch-derived carbon materials in a closed graphite crucible. These silicon-containing carbon materials were obtained by homogenization and co-carbonization of a hybrid precursor consisting of the toluene soluble fraction of coal tar pitch with polycarbosilane (PCS). The composition, morphology and structure of the nanowires were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The influence of pyrolysis temperature on the growth of

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Section: Resultsmentioning

confidence: 99%

Synthesis of SiC nanowires via catalyst-free pyrolysis of silicon-containing carbon materials derived from a hybrid precursor

Dong

Meng

Zhu

et al. 2017

Ceramics International

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“…The small shoulder and peaks correspond to a-SiC crystallite. According to the computer simulation results calculated by Pujar and Cawley [30], the additional peaks result from stacking faults [31][32][33][34][35]. Another viewpoint attributes these additional peaks to the existence of the 2H polytype [36].…”

Section: Surface Shapementioning

confidence: 95%

Characterization of nanoporous β-SiC fiber complex prepared by electrospinning and carbothermal reduction

Lee¹,

Yun

Kim

et al. 2010

Res Chem Intermed

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The nanoporous b-silicon carbide (SiC) nano-sized fiber complex were made from precursors of various ratios with (SiO 2 ) as silicon source and polyacrylonitrile as carbon source by simple electrospinning method and economical carbothermal reduction. The prepared samples were characterized by SEM for surface shape, XRD for crystalline properties, TGA in air for oxygen resistance, and BET for porosity according to the precursor components (C/Si mol ratio). The samples with carbon ratio to silicon (C/Si) of five or more in the precursor showed the long fiber shape. Increasing the C/Si in the precursor solution tended to lead higher b-SiC crystalline and smaller crystallite size than low C/Si in the precursor solution because excess carbon could act as a dispersant and barrier to prevent neck growth or adhesion of SiC. The prepared samples have superior oxidation resistance as a whole. The increment of the C/Si leads to the increment of porosity. Also, it seems that the gaseous pore development of carbon during carbothermal reduction leads to mainly small pores (micro-or mesopores).

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“…Th erefore the obtained silicon oxycarbide (SiOC) ceramic structures have been assumed to be amorphous. In accordance to results in the literature phase separation and crystallization occur at temperatures above 1200 °C [20]. Foams with additional strut porosity were prepared by using distinct pore formers made up of polymethylmethacrylate (PMMA) microbeads or ultra-high molecular weight polyethylene grains (PE), respectively.…”

Section: Resultsmentioning

confidence: 86%

Polymer derived ceramic foams with additional strut porosity

Reschke¹,

Laskowsky²,

Kappa³

et al. 2011

Epitoanyag-JSBCM

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Ceramic foams with additional strut porosity were prepared by a self-foaming process of a polysilsesquioxane. The strut porosity was generated by adding sacrificial pore formers comprising of polymethylmethacrylate or of polyethylene to the self-foaming silicone. The polymer-inherent shrinkage was reduced by adding SiC particulate fillers to the silicone/pore-former mixture. Foaming was carried out on a preheated furnace at 270 °C, and subsequent pyrolysis was performed in argon atmosphere in the temperature range from 800 °C to 1200 °C in order to trigger the polymer-to-ceramic transformation of the polysilsesquioxane. The materials were characterized with respect to the pore size and the total porosity, the microstructure and the mechanical strength. The volumetric mean pore diameter of the strut ranged from 25 μm to 100 μm and the porosity was found to be 40% to 94%. The maximum compression strength exceeded 16 MPa.

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Phase Separation in an SiCO Glass Studied by Transmission Electron Microscopy and Electron Energy‐Loss Spectroscopy

Cited by 152 publications

References 20 publications

Synthesis of SiC nanowires via catalyst-free pyrolysis of silicon-containing carbon materials derived from a hybrid precursor

Synthesis of SiC nanowires via catalyst-free pyrolysis of silicon-containing carbon materials derived from a hybrid precursor

Characterization of nanoporous β-SiC fiber complex prepared by electrospinning and carbothermal reduction

Polymer derived ceramic foams with additional strut porosity

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