Rapid fabrication of high density C/C composite by coupling of processes

The first cut results on the development of ultra-thin, low gas permeable, easily machineable, high electrical conductivity and high mechanical strength bipolar plate made up of carbon reinforced ceramic matrix are reported for the strategic application. Short carbon fiber reinforced silicon carbide matrix composite is fabricated by chopping continuous carbon fibers into discrete length, exfoliating and dispersing the exfoliated carbon fibers in silicon carbide powder and finally hot-pressing to make the composite. Three compacts containing exfoliated carbon fiber contents of 20, 30, 50 vol. % in silicon carbide matrix are prepared and characterized for electrical, thermal, gas permeability, density, and mechanical properties. The composite plates with exfoliated carbon fiber vol. % of 50, offer excellent electrical conductivity, flexural and compressive strengths and gas permeability of 2.2 3 10 -7 cm -3 cm -2 s -1. Carbon/silicon carbide plate shows 37.5 % and 4.7 % lower volume and weight, respectively on comparing with the best reported data of carbon/polymer composite plate. Competency of the material for bipolar plate fabrication is tested and found that the ceramic carbon composite may open up the new horizon for the fabrication of ultra-thin bipolar plates for strategic applications.

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“…t ¼ time of the test s ð Þ: The details of the permeability set up and the methodology to measure the permeability are described elsewhere [21].…”

Section: Helium Gas Permeabilitymentioning

confidence: 99%

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Raunija

Gautam

Verma

2018

Materialwissenschaft Werkst

Self Cite

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“…Recently, pitch-based matrix C/Cs have received increasing attention from researchers because of their high carbon content, high residual carbon rate, easy graphitization, low cost of raw materials, short preparation cycle and simple preparation process. [6][7][8] However, the carbon matrix is volatile during the carbonization process of high-temperature sintering, and cracks are easily formed at the interface of the carbon fiber (CF) and matrix, resulting in the force or thermal load not being transferred from the carrier matrix to the fibers in the C/Cs fracture process. This greatly limits the application of C/Cs in terms of higher mechanical strength and thermal properties, etc.…”

Section: Introductionmentioning

confidence: 99%

Improving carbon/carbon composites mechanical and thermal properties by the co‐carbonization of pre‐oxidized carbon fiber and pitch

Yang

et al. 2021

J of Applied Polymer Sci

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The interfacial cracks generated during the high-temperature carbonization process, caused by the mismatch of thermal shrinkage rate between the fiber and matrix, limit the huge application potential of C/C composites. In this study, pre-oxidized carbon fiber (OPF) prepared from pitch, as a reinforcement, was introduced into the pitch-based carbon matrix to realize the co-carbonization of OPF and pitch. The results showed that the mechanical and thermal properties of the OPF-reinforced C/C composites were significantly improved. The compressive strength and flexural strength were 136.97 and 46.71 MPa, respectively, both were about 2.5 times higher than those of pristine C/C composites. And OPF-C/Cs had a carbon residual of about 30% at 800 C, which was 2.8, 4.4, and 2.1 times higher than that of Pristine-C/Cs, CF-C/ Cs, and MCF-C/Cs, respectively. The rough surface and abundant active sites of OPF could promote the growth of the graphite microcrystalline structure, resulting in an excellent fiber/matrix interface. Moreover, the adaptive expansion of OPF occurred during the co-carbonization process with pitch, which inhibited the generation of cracks at the fiber/matrix interface. Owing to its excellent affinity with pitch, OPF is believed to have a wide range of promising applications in highperformance C/C composites that require high-temperature treatment.

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Impregnated thermoset pre-pressurized carbon composite electrodes in microbial fuel cell: Compositional functionalities influence on ORR with reference to graphite

Sravan

Raunija

Verma

et al. 2021

Fuel

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Rapid fabrication of high density C/C composite by coupling of processes

Cited by 3 publications

References 2 publications

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Ultra‐thin carbon/silicon carbide composite bipolar plate for advanced fuel cells

Improving carbon/carbon composites mechanical and thermal properties by the co‐carbonization of pre‐oxidized carbon fiber and pitch

Impregnated thermoset pre-pressurized carbon composite electrodes in microbial fuel cell: Compositional functionalities influence on ORR with reference to graphite

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