Microstructure and electrical resistivity of carbon/carbon composites prepared by thermal gradient chemical vapor infiltration

Wu, Xiaowen; Du, Guotong; Fang, Minghao; Mei, Lefu

doi:10.1177/0731684412447865

Cited by 5 publications

(2 citation statements)

References 10 publications

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“…This means that the percolation threshold of CB is much lower than that of graphite. 25 Thus, doping CB is better than doping graphite when preparing conductive composites with a certain resistivity.…”

Section: Effects Of the Cb Content On The Mechanical And Electrical Pmentioning

confidence: 99%

Effects of carbon black content on the microstructure and properties of carbon/ceramic conductive composites

Gao¹,

Zheng²,

Liu³

et al. 2019

Mater. Tehnol.

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Carbon/ceramic conductive composites have been widely used in many fields such as aerospace, industrial heating and health care due to the excellent characteristics of the ceramic matrix and carbon-based conductive fillers. In this paper, carbon/ceramic conductive composites were prepared with a ceramic matrix (albite, diopside and quartz) and carbon-black (CB) conductive filler, and the effects of the CB content on the phase composition, microstructure, sintering performance, mechanical and electrical properties of the composites were studied. The results showed that CB particles entered the pores among the ceramics particles when the CB content increased from 0 w/% to 5 w/%, accompanied with a degradation of the porosity, water absorption, sintering performance and electrical conductivity but an enhancement of the mechanical properties. With a further increase in the CB content, the number of the CB particles on the surfaces of the ceramic particles was increased and the porosity began to increase while the mechanical properties were degraded. During the increase in the CB content, there was little variation in the sintering properties but the electronic conductivity decreased a lot.Kompoziti ogljik/keramika s kerami~no matrico in prevodnim polnilom se danes zaradi odli~nih lastnosti uporabljajo na mnogih podro~jih, kot so letalske in vesoljske tehnologije, industrijsko ogrevanje in zdravstvo. Avtorji opisujejo pripravo prevodnih kompozitov s kerami~no matrico (albit, diopsid in kvarz) in prevodnim polnilom iz~rnega ogljika (CB, angl:: carbon black). Raziskovali so vpliv vsebnosti CB na fazno sestavo, mikrostrukturo, sinterabilnost, mehanske in elektri~ne lastnosti izdelanih kompozitov. Rezultati preiskav so pokazali, da se CB delci nahajajo v porah med kerami~nimi delci, ko vsebnost CB delcev naraste z 0 na 5 masnih dele`ev. To zmanj{a poroznost, absorpcijo vode, sinterabilnost in elektri~no prevodnost, a izbolj{a mehanske lastnosti kompozita. Z nadaljnjim pove~evanjem vsebnosti CB se pove~uje {tevilo CB delcev na povr{ini kerami~nih delcev, poroznost nara{~a in mehanske lastnosti se poslab{ajo. S pove~evanjem vsebnosti delcev se le malo spremeni sinterabilnost, elektronska prevodnost pa se mo~no zmanj{a. Klju~ne besede: prevodni kompoziti ogljik/keramika, vsebnost~rnega ogljika, mikrostruktura, lastnosti

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Section: Effects Of the Cb Content On The Mechanical And Electrical Pmentioning

confidence: 99%

Effects of carbon black content on the microstructure and properties of carbon/ceramic conductive composites

Gao¹,

Zheng²,

Liu³

et al. 2019

Mater. Tehnol.

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“…In particular, the components that including carbon fiber (CF), pyrocarbon, and pores have serious influence for the mechanical, thermal, tribological, and electrical properties of C/C composites. Such as the porosity of C/C composites is the major influencing factor of shear strength, and electrical resistivity (Barbosa, Pardini, & Botelho, 2015;Casal, Granda, Bermejo, Bonhomme, & Men endez, 2001), the increase of CF fraction would raise the internal friction of C/C composites (Hou, Li, Wang, Zhu, & Shen, 2000), and the structure and content of matrix are all closely related to mechanical, tribological, and electrical properties (Jia, Li, Zhang, Li, & Ren, 2014;Reznik, Guellali, Gerthsen, Oberacker, & Hoffmann, 2002;Wu, Du,, Fang, & Mei, 2012;Xu, Li, Bai, Wei, & Zhai, 2008;Yu et al, 2013).It means that we could enhance the properties through controlling the microstructure of C/C composites. Thus, the quantitative calculation of components is an essential prerequisite for studying the microstructure, and can provide a scientific guidance for improving the macroscopic properties.…”

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confidence: 99%

Quantitative characterization of the carbon/carbon composites components based on video of polarized light microscope

Song

et al. 2017

Microscopy Res & Technique

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The components of carbon/carbon (C/C) composites have significant influence on the thermal and mechanical properties, so a quantitative characterization of component is necessary to study the microstructure of C/C composites, and further to improve the macroscopic properties of C/C composites. Considering the extinction crosses of the pyrocarbon matrix have significant moving features, the polarized light microscope (PLM) video is used to characterize C/C composites quantitatively because it contains sufficiently dynamic and structure information. Then the optical flow method is introduced to compute the optical flow field between the adjacent frames, and segment the components of C/C composites from PLM image by image processing. Meanwhile the matrix with different textures is re-segmented by the length difference of motion vectors, and then the component fraction of each component and extinction angle of pyrocarbon matrix are calculated directly. Finally, the C/C composites are successfully characterized from three aspects of carbon fiber, pyrocarbon, and pores by a series of image processing operators based on PLM video, and the errors of component fractions are less than 15%.

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2017

Carbon Composites

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Microstructure and electrical resistivity of carbon/carbon composites prepared by thermal gradient chemical vapor infiltration

Cited by 5 publications

References 10 publications

Effects of carbon black content on the microstructure and properties of carbon/ceramic conductive composites

Effects of carbon black content on the microstructure and properties of carbon/ceramic conductive composites

Quantitative characterization of the carbon/carbon composites components based on video of polarized light microscope

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