High temperature structure evolution of macroporous SiOC ceramics prepared by a sol–gel method

Liu, Chen; Meng, Xianyu; Zhang, Xinghong; Hong, Changqing; Han, Jiecai; Han, Wenbo; Xu, Baosheng; Dong, Shun; Du, Shanyi

doi:10.1016/j.ceramint.2015.05.056

Cited by 45 publications

(27 citation statements)

References 35 publications

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“…6). The spectrum of MK resin shows absorption bands at ν=765, 1275 cm −1 (Si-CH 3 ), ν=2913, 2975 cm -1 (C-H), ν=1618, 3437 cm -1 (Si-OH), ν=1023 cm −1 (Si-O-C) and ν=1111 cm −1 (Si-O-Si), as previously 无机材料学报第 34 卷 reported [16,[20][21][22][23] . As the curing time increases, the intensity of absorption bands assigned to Si-O-C and Si-O-Si slightly increases.…”

Section: Curing and Ceramization Behavior Of Mk Resinsupporting

confidence: 82%

“…The weight loss mainly occurred in two temperature ranges. A weight loss of about 4.91wt% occurred at temperatures ranging from 170 ℃ to 350 ℃, which may be ascribed to the vaporization of H 2 O, n-propanol, ethanol and POSS during the cross-linking process [16,[23][24][25][26] . A further weight loss of about ~6.09wt% occurs between 350 and 900 ℃, which may be resulted from breakage/ rearrangement of molecular chains and release of a large number of small molecular gas, such as H 2 , H 2 O and propane, etc.…”

Section: Curing and Ceramization Behavior Of Mk Resinmentioning

confidence: 99%

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C/SiOC Composites by a Modified PIP Using Solid Polysiloxane: Fabrication, Microstructure and Mechanical Properties

Wu¹,

Wang²,

Ding³

et al. 2019

Journal of Inorganic Materials

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A modified polymer infiltration and pyrolysis method (PIP) was developed to enhance the densification of C/SiOC composites, using molten MK resin (polymethylsilsesquioxane) as precursor. Organic sulfonic acid was added as cross-linking agent to lower the curing temperature. The cross-linking mechanism and ceramization behavior of MK resin was studied. A high ceramic yield of about 85wt% and low free carbon content below 3wt% are achieved, with excellent high-temperature stability of the derived SiOC. The modified PIP approach presents a high densification efficiency. After only 8 PIP cycles, the final C/SiOC composites possess a density of about 1.81 g/cm 3. Compared with those composites fabricated by conventional PIP process, the C/SiOC composites prepared by modified PIP process show a much denser microstructure with much more improved densification efficiency. Bending strength of the as-fabricated C/SiOC composites is of (312±25) MPa, showing obvious non-brittle fracture behavior.

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Section: Curing and Ceramization Behavior Of Mk Resinsupporting

confidence: 82%

Section: Curing and Ceramization Behavior Of Mk Resinmentioning

confidence: 99%

C/SiOC Composites by a Modified PIP Using Solid Polysiloxane: Fabrication, Microstructure and Mechanical Properties

Wu¹,

Wang²,

Ding³

et al. 2019

Journal of Inorganic Materials

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“…The above results confirm that the crystallization of β-SiC would be promoted by the increasing of pyrolysis temperature, and the pyrolysis temperature plays an important role in the composition of the composites after the introduction of SiOC. During the high-temperature treatment, the following reactions would occur within the structural evolution of the SiOC preceramic based on previous results [11,13,27]:…”

Section: Effect Of Pyrolysis Temperature On the Composition And Micromentioning

confidence: 99%

“…According to previous literature, the composition and microstructure of composites with the addition of SiOC precursor were strongly dependent on the pyrolysis temperature. Therefore, the effect of the pyrolysis temperature on the composition and microstructure of the as-obtained composites was investigated first [11,13,27]. Figure 1 shows the XRD patterns collected on the composites pyrolyzed at 1200, 1400, and 1600 • C for 60 min.…”

Section: Effect Of Pyrolysis Temperature On the Composition And Micromentioning

confidence: 99%

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

Sun

2020

Applied Sciences

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This paper focuses on the preparation of boron-containing phenolic resin (BPR)-derived carbon modified three-dimensional (3D) needled carbon fiber reinforced silicon oxycarbide (SiOC) composites through a simple precursor infiltration and pyrolysis process (PIP), and the influence of PIP cycle numbers on the microstructure, mechanical, high-temperature oxidation resistance. The electromagnetic wave (EMW) absorption properties of the composites were investigated for the first time. The pyrolysis temperature played an important role in the structural evolution of the SiOC precursor, as temperatures above 1400 °C would cause phase separation of the SiOC and the formation of silicon carbide (SiC), silica (SiO2), and carbon. The density and compressive strength of the composites increased as the PIP cycle number increased: the value for the sample with 3 PIP cycles was 0.77 g/cm3, 7.18 ± 1.92 MPa in XY direction and 9.01 ± 1.25 MPa in Z direction, respectively. This composite presented excellent high-temperature oxidation resistance and thermal stability properties with weight retention above 95% up to 1000 °C both under air and Ar atmosphere. The minimal reflection loss (RLmin) value and the widest effective absorption bandwidth (EAB) value of as-prepared composites was −24.31 dB and 4.9 GHz under the optimization condition for the sample with 3 PIP cycles. The above results indicate that our BPR-derived carbon modified 3D needled carbon fiber reinforced SiOC composites could be considered as a promising material for practical applications.

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“…The traditional approach to producing amorphous SiOC microstructure has been via physical and chemical processing methods, such as powder metallurgy process [19], magnetron sputtering [20], sol-gel method [21,22], and chemical vapor deposition [23]. The raw materials used in synthesizing these SiOC materials were mainly chemical feedstocks such as tetraethoxysilane (TEOS)/hydroxyl-terminated polydimethylsiloxane (PDMS) organic-inorganic hybrid materials [17], polyxiloxane [18], methyltrimethoxysilane and dimethyldimethoxysilane [22], and dimethyl dimethoxy silane [21]. There are also limited studies on the thermal conductivity of SiOC materials.…”

Section: Introductionmentioning

confidence: 99%

Physical and Thermal Studies of Carbon-Enriched Silicon Oxycarbide Synthesized from Floating Plants

et al. 2019

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In the present study, amorphous mesoporous silicon oxycarbide materials (SiOC) were successfully synthesized via a low-cost facile method by using potassium hydroxide activation, high temperature carbonization, and acid treatment. The precursors were obtained from floating plants (floating moss, water cabbage, and water caltrops). X-ray diffraction (XRD) results confirmed the amorphous Si–O–C structure and Raman spectra revealed the graphitized carbon phase. Floating moss sample resulted in a rather rough surface with irregular patches and water caltrops sample resulted in a highly porous network structure. The rough surface of the floating moss sample with greater particle size is caused by the high carbon/oxygen ratio (1: 0.29) and low amount of hydroxyl group compared to the other two samples. The pore volumes of these floating moss, water cabbage, and water caltrops samples were 0.4, 0.49, and 0.63 cm3 g−1, respectively, resulting in thermal conductivities of 6.55, 2.46, and 1.14 Wm−1 K−1, respectively. Floating plants, or more specifically, floating moss, are thus a potential material for SiOC production.

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High temperature structure evolution of macroporous SiOC ceramics prepared by a sol–gel method

Cited by 45 publications

References 35 publications

C/SiOC Composites by a Modified PIP Using Solid Polysiloxane: Fabrication, Microstructure and Mechanical Properties

C/SiOC Composites by a Modified PIP Using Solid Polysiloxane: Fabrication, Microstructure and Mechanical Properties

Strong and Thermostable Boron-Containing Phenolic Resin-Derived Carbon Modified Three-Dimensional Needled Carbon Fiber Reinforced Silicon Oxycarbide Composites with Tunable High-Performance Microwave Absorption Properties

Physical and Thermal Studies of Carbon-Enriched Silicon Oxycarbide Synthesized from Floating Plants

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