Thermal redistribution reactions of Blackglas™ ceramic

Wang, Feng; Apple, T.; Gill, William N.

doi:10.1002/app.1424

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…Meanwhile, in the FTIR spectra (Figure B), with increasing pyrolysis temperature, changes in the intensity of the absorption peaks become obvious and result in a gradual increase in the ratio of intensities of Si–C bonds to Si–O bonds. At 1500°C specifically, a significant change is noted where the intensity of Si–C bonds is slightly higher than that of Si–O bonds, implying that the Si(O, C) 4 structure was transformed into SiO 4 and SiC 4 structures, confirmed with the previous analysis.…”

Section: Resultssupporting

confidence: 85%

First printing of continuous fibers into ceramics

et al. 2018

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This article reports a novel method for three‐dimensional (3D) printing of continuous fibers into ceramics to improve the mechanical properties of printed ceramics, which is difficult in other 3D printing technologies. The ceramics were derived by pyrolysis of thermoplastic ceramic precursor feedstocks, which were prepared by two methods. One is homogeneously mixing thermoplastic resins and ceramic precursors. The feedstocks prepared by this method exhibit good thermoplastic properties and can be extruded into filaments. Ceramics were obtained by heating the feedstocks to 1100°C in argon atmosphere. The ceramics were amorphous and remained stable during 1100‐1300°C; at 1400°C they decomposed into β–SiC with simultaneous volatile gas generation. Above 1400°C, their quality decreased significantly due to cracking of ceramic skeletons. The other method is directly heating, extruding and printing the ceramic precursor. The precursors showed good printability and complex ceramic structures were printed with continuous carbon fibers inside. The continuous carbon fibers improved the flexural strength of pyrolytic ceramics, which is about 7.6 times better than that of the ceramics without fibers. The novel method unravels the potential of 3D printing of continuous fibers into ceramics with complex lightweight structures to improve the strength.

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Section: Resultssupporting

confidence: 85%

First printing of continuous fibers into ceramics

et al. 2018

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“… The labels X, M, D, T, and Q refer to the number of bridging O atoms that surround the Si atom, i.e., SiC 4 - x O x units with x = 0, 1, 2, 3, and 4, respectively. These redistribution reactions (very common in organosilicon chemistry) have been well-documented in the literature. ,, …”

Section: Resultsmentioning

confidence: 90%

Gel to Glass Transformation of Methyltriethoxysilane: A Silicon Oxycarbide Glass Precursor Investigated Using Vibrational Spectroscopy

et al. 2005

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Gel to glass transformation of methyltriethoxysilane was investigated using infrared and Raman spectroscopies. The vibrational frequencies of the Si-O network are found to be a sensitive probe of the gel to glass transformation, which is measured to be at ca. 950°C for this system, under the experimental conditions used for the synthesis. Vibrational data are also compatible with an earlier suggestion of the presence of polyhedral silsesquioxanes type structures embedded in a 3-D network. Further evidence is presented for the formation of Si-CH 2 -Si and Si-C 2 H 4 -Si units during the pyrolysis process.

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“…ⅷ Thermal redistribution reactions do not affect the kinetics of gas formation since these reactions in the solid phase are slow compared to thermal degradation reactions leading Ž . to gas formation Wang et al, 2001 ;and ⅷ The overall process is an endothermic one. Although heat may be released via radical recombination reactions, the amount of heat released in those reactions is negligible compared to the energy input needed for decomposition.…”

Section: Rate Equationsmentioning

confidence: 99%