Effects of infiltration conditions on the densification behavior of carbon/carbon composites prepared by a directional-flow thermal gradient CVI process

Tang, Zhaoping; Qu, Dianning; Xiong, Jie; Zou, Zhiqiang

doi:10.1016/s0008-6223(03)00374-9

Cited by 22 publications

(10 citation statements)

References 12 publications

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“…The pyrocarbon deposition rate is presented in figure 4 as a function of the inlet hydrogen mole fraction in the reactor. In accordance to previous observation the presence of hydrogen in the gas phase has an important inhibition effect on pyrocarbon deposition [11][12][13][14][15]. Indeed, the deposition rate of pyrocarbon is slower when the hydrogen mole fraction increases.…”

Section: Influence Of the Hydrogen Addition On The Pyrocarbon Depositsupporting

confidence: 91%

“…Tang et al have also studied the effect of hydrogen on pyrocarbon deposition rate [15]. In their experimental conditions they have concluded that despite its inhibition on pyrocarbon deposition, H2 is acting as a non-inert carrier gas, and it has positive effects on the densification of carbon fibers preforms when the control temperature is higher than 1173 K; but it has negative effects on the densification when the control temperature is as low as 1123 K.…”

Section: Table I: Hydrogen Inhibition Functions Of a Global Depositiomentioning

confidence: 99%

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An interpretation of the hydrogen inhibiting effect on chemical vapor deposition of pyrocarbon

Ziegler-Devin

Fournet

Lacroix

et al. 2015

Journal of Analytical and Applied Pyrolysis

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A c c e p t e d M a n u s c r i p t Highlights A kinetic mechanism describing propane pyrolysis and pyrocarbon deposition is used. Pyrocarbon is mostly formed by deposition of methyl radicals, acetylene and ethylene.Hydrogen has an inhibiting effect on pyrocarbon deposition during propane pyrolysis.This inhibiting effect is explained by using the validated mechanism.Abstract 1 A detailed kinetic mechanism, based on elementary steps, modeling both pyrocarbon 2 deposition and gas phase composition obtained by propane pyrolysis on carbon fibers was 3 recently proposed. This model, based on heterogeneous and homogeneous elementary steps 4 was efficient to predict pyrocarbon deposition rate and gas phase composition when the 5 influence of temperature (1173-1323 K), residence time (0.5-4 s), carbon surface fibers, and 6 reactor inlet mixture were studied. In this paper, we discuss experimental and modeling 7 results of hydrogen inhibiting effects on pyrocarbon deposited and gas phase composition 8 during propane/hydrogen pyrolysis (temperature 1273K, residence time 1s, surface fibers 9 3960 cm -1 ) . Simulated results are coherent with experimental data when the pyrocarbon 10 deposition rate is studied. Compared to pure propane chemical vapour deposition, the mole 11 fractions of C 2 gas phase species are not affected by an increasing of hydrogen inlet, whereas 12 pyrocarbon deposition rate and mole fractions of C 3 and aromatic species decrease. These 13 results also confirm, in accordance with the literature, that hydrogen inhibits highly the 14 formation of pyrocarbon and aromatic species. 15 16

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Section: Influence Of the Hydrogen Addition On The Pyrocarbon Depositsupporting

confidence: 91%

Section: Table I: Hydrogen Inhibition Functions Of a Global Depositiomentioning

confidence: 99%

An interpretation of the hydrogen inhibiting effect on chemical vapor deposition of pyrocarbon

Ziegler-Devin

Fournet

Lacroix

et al. 2015

Journal of Analytical and Applied Pyrolysis

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“…Hence larger application of FCVI can provide a path for its application in nuclear reactors. This C/SiC has become promising material of choice possessing excellent thermal, mechanical, and ablative properties [87][88][89][90]. The deposition channels/pores in C/SiC get easily blocked during the infiltration process further giving rise to bottleneck effects and limited densification [91,92].…”

Section: Chemical Vapor Infiltrationmentioning

confidence: 99%

A Review on Si-Based Ceramic Matrix Composites and their Infiltration Based Techniques

Radhika

Sathish

2022

Silicon

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This review paper aims to look at silicon-based ceramic matrix composites and infiltration-based approaches for them. There are many different types of infiltration-based manufacturing processes, each with its own set of features. The best technique is chosen depending on the needs and desired attributes. With these considerations in mind, any type of infiltration might be selected to meet the requirements. Silicon-based ceramics has been highly used in the fields of aerospace, medical, automobile, electronics, and other various industries so it is important to study about their applications as well. This review outlines the evolution of composites from early 7000 BCE to composites today and discussed about various infiltration techniques for manufacturing silicon based ceramic matrix composites. This article also gives the comprehensive review of general characteristics and mechanical properties of silicon-based composites used in a variety of engineering sectors. The application section entails the wide range of engineering fields with consideration of infiltration techniques, which would be helpful for researchers to study and correlate the different infiltration techniques for end applications.

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“…In order to solve these problems, we designed a two-channel F-TGCVI reactor, which is expected to obtain a thicker and more uniform composite material. Since running timescale experiments to test this design or optimize the parameters can be very expensive [18], the numerical simulation might be an economically viable way.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Forced Flow-thermal Gradient CVI: Effects of Control Parameters and Processing Schemes on a Densification

Wang

Luo

Zhang

et al. 2020

Preprint

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A two-channel temperature-control infiltration reactor aiming at fabricating thicker and more uniform composites was designed. Unsteady numerical simulations containing hydrodynamics, mass transfer, heat transfer and pore structure evolution were carried out. By analyzing the effects of concentration, velocity and temperature on the porosity distribution, different densification schemes were proposed and compared. Results show that a preform of thickness 0.04 m and initial porosity 0.8 can be densified to a uniform and compact one with the maximum porosity of 0.1 within 300 hours through the three-step densification scheme. This scheme not only assures a low and uniform porosity over the whole preform but also avoids the huge pumping pressure which may cause the preform cracking.

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Effects of infiltration conditions on the densification behavior of carbon/carbon composites prepared by a directional-flow thermal gradient CVI process

Cited by 22 publications

References 12 publications

An interpretation of the hydrogen inhibiting effect on chemical vapor deposition of pyrocarbon

An interpretation of the hydrogen inhibiting effect on chemical vapor deposition of pyrocarbon

A Review on Si-Based Ceramic Matrix Composites and their Infiltration Based Techniques

Modeling of Forced Flow-thermal Gradient CVI: Effects of Control Parameters and Processing Schemes on a Densification

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