Fabrication and properties of reaction-formed SiC by infiltrating molten Si into mesocarbon microbeads-based carbon preform

Xia, Hongyan; Wang, Jiping; Jin, Haiyun; Shi, Zhongqi; Qiao, Guanjun

doi:10.1016/j.msea.2010.08.088

Cited by 21 publications

(3 citation statements)

References 24 publications

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“…During high-temperature pyrolysis, the graphite carbon was formed from FA, and the amorphous carbon was formed from PF at 1850 • C. Therefore, the composite carbon sources were introduced into the porous preform by impregnation and high-temperature pyrolysis. The reactivity of carbon is affected by its crystallinity [16][17][18][19]. In this paper, the ratio of graphite carbon to amorphous carbon is controlled to regulate the reaction process between carbon and liquid Si, so as to avoid the phenomenon of pore-clogging.…”

Section: Rb-sicmentioning

confidence: 99%

Structure Evolution and Properties Modification for Reaction-Bonded Silicon Carbide

Zhang

Cui

et al. 2022

Materials

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Complex structure reaction-bonded silicon carbide (RB-SiC) can be prepared by reactive melt infiltration (RMI) and digital light processing (DLP). However, the strength and modulus of RB-SiC prepared by DLP are not sufficient, due to its low solid content (around 40 vol.%), compared with the traditional fabrication techniques (solid content > 60 vol.%). With this understanding, a new method to improve the properties of RB-SiC was proposed, by the impregnation of composite precursor into the porous preform. The composite precursor was composed of phenolic (PF) resin and furfuryl alcohol (FA). PF and FA were pyrolyzed at 1850 °C to obtain amorphous carbon and graphite into the porous preform, respectively. The effects of multiphase carbon on the microstructure and performance of RB-SiC was studied. When the mass ratio of PF to FA was 1/4, the solid content of RB-SiC increased from 40 vol.% to 68.6 vol.%. The strength, bulk density and modulus were 323.12 MPa, 2.94 g/cm3 and 348.83 Gpa, respectively. This method demonstrated that the reaction process between liquid Si and carbon could be controlled by the introduction of multiphase carbon into the porous preforms, which has the potential to regulate the microstructure and properties of RB-SiC prepared by additive manufacturing or other forming methods.

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Section: Rb-sicmentioning

confidence: 99%

Structure Evolution and Properties Modification for Reaction-Bonded Silicon Carbide

Zhang

Cui

et al. 2022

Materials

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“…After that, the thermal condensation reaction was performed, in which secondary growth of original microbeads could be found. Moreover, a few solid additives with respective typical crystalline features, such as carbon black, , graphite powder, SiC, ferrocene, , etc., can also be employed as crystallization centers to guide the assigned structural developments of mesocarbon microbeads. The above-mentioned facts are indicative of promoting effects of compounds with certain crystalline structures on formation and development of anisotropic structures during the carbonation reaction.…”

Section: Introductionmentioning

confidence: 99%

Effects of Inductive Condensation on Mesophase Development during Aromatic-Rich Oil Carbonization

Lou

et al. 2019

Energy Fuels

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A novel method was discussed for the preparation of petroleum-based mesophase pitch with a large domain structure and an ordered microcrystal structure. A condensation pitch with a certain amount of anisotropic structures was generated from an aromatic-rich oil from FCC slurry oil by heat treatment. The aromatic-rich oil was used to prepare mesophase pitch by inductive thermal condensation with n-heptane insolubles of the above condensation pitch as seed. Inductive effects of seed on mesophase formation and development were investigated by analyzing the properties of thbe carbonized products. Results showed that mesophase pitch obtained by inductive thermal condensation possessed more anisotropic structures, better optical texture, and microcrystal structure when compared to mesophase pitches produced through direct thermal condensation at low or high reaction temperatures. The introduction of seed was conducive to the improvement of mesophase pitch properties by reducing the reaction activation energy and inducing the formation of anisotropic structures at a low temperature.

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“…For example, when porous carbons are employed as catalytic materials for counter electrode in dye-sensitized solar cells (DSCs), the photoelectric performances of the devices are evidently dominated by the pore characteristics of porous carbons. Moreover, the apparent shape of porous carbons is another key factor to determine the applications [4,5]. For example, carbon monolith is used for electrochemical double layer capacitor (EDLC) for its purity and integrity without using macromolecule binder and rigid templates avoiding the external deposit.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach Based on Polymerization-Induced Phase Separation to Prepare Carbon Monolith with Oriented Flat Porous Structure

Zhao

Xiao

et al. 2014

AMM

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A novel approach has been developed to fabricate an oriented flat porous carbon (OFPC) by combining the polymerizationinduced phase separation and pyrolysis (PIPSP) and the directional compressive deformation (DCD). At first, an elastic body in the shape of cylinder is obtained by controlling the polymerization degree of resin, and then the application of symmetrical axial pressures results in the directional deformation of two interconnected phases (of a polymerized resin phase and a poreforming agent phase) in the elastic body. Then the elastic deformed body is transformed to the rigid deformed body by precuring and further to the cured body by curing. At last, the cured body is pyrolyzed to form an OFPC. The pressures are removed after precuring. The pores in the OFPC are survived as the discs in the radial direction. Both flat pores and carbon skeletons in the OFPC are oriented toward a radial direction. The OFPC has comparable pore volume with a normal porous carbon, which is fabricated by the PIPSP with same process except for the application of the DCD.

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Fabrication and properties of reaction-formed SiC by infiltrating molten Si into mesocarbon microbeads-based carbon preform

Cited by 21 publications

References 24 publications

Structure Evolution and Properties Modification for Reaction-Bonded Silicon Carbide

Structure Evolution and Properties Modification for Reaction-Bonded Silicon Carbide

Effects of Inductive Condensation on Mesophase Development during Aromatic-Rich Oil Carbonization

A Novel Approach Based on Polymerization-Induced Phase Separation to Prepare Carbon Monolith with Oriented Flat Porous Structure

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