Carbon/Carbons and their Industrial Applications

Hatta, Hiroshi; Weiß, Roland; David, Patrick

doi:10.1002/9781118832998.ch5

Cited by 10 publications

(7 citation statements)

References 98 publications

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“…From a thermal viewpoint, it appears from Fig. (11) that the evolutions of the temperatures at selected locations have been quite well reproduced, with a notable exception at the top of the preform, a region where expulsion of the liquid from the preform has been predicted but not achieved experimentally, as opposed to the rest of the preform. From the time evolutions of the temperature and porosity fields reported in Figure (12), it is seen that the infiltration reproduces again the "trilby hat" effect, though only with a slight depletion of the density in the middle of the preform section, accompanied by a strong decrease of the space gradient of temperature in the central region.…”

Section: 1 Direct Numerical Simulationsmentioning

confidence: 89%

“…This composite structure confers them a non-brittle behavior with progressive damage during loading, therefore countering the largest weakness of ceramics as structural materials. Successful applications of C/C composites encompass aircraft braking discs [7], solid rocket motor throttles and divergents [8], thermal protection systems for atmospheric re-entry [9], ion thruster grids [10] and other applications in industry [11,12]. C/SiC composites [13] were designed to overcome the poor oxidation resistance of C/C composites, with successful applications as automotive braking discs [14], rocket nozzles [15], thermal protection systems, parts for industrial furnace management [16] and in aeronautic propulsion [17,18].…”

Section: Introductionmentioning

confidence: 99%

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How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

et al. 2023

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Section: 1 Direct Numerical Simulationsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

et al. 2023

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“…Moreover, in some long fibres CMCs, the matrix itself can be a particulate ceramic, as it is the case of some melt infiltrated SiC/SiC. Ghosh et al [13,14] studied the behaviour of a particulate ZrB2-SiC when performing scratch tests at different loads. Even if the main objective of the study was not to understand the material removal mechanism but to comprehend the impact resistance, similarities in the results can be obtained as very small uncut chip thickness are normally used when machining hard ceramics/CMCs.…”

Section: Figure 5 Sem Images Of a C/sic With A Scratch Angle Of (A) 90° And (B) 45°mentioning

confidence: 99%

The new challenges of machining Ceramic Matrix Composites (CMCs): Review of surface integrity

Gavaldà-Diaz

Luna

Liao

et al. 2019

International Journal of Machine Tools and Manufacture

216

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Ceramic Matrix Composites (CMCs) are currently an increasing material choice for several high value and safety-critical components, fact that has recently originated the need of understanding the effect of several machining processes. Due to the complex nature of CMCs -i.e. heterogeneous structure, anisotropic thermal and mechanical behaviour and generally the hard nature of at least one of the constituents (e.g. fibre or matrix)machining become extremely challenging as the process can yield high mechanical and thermal loads. Furthermore, the orthotropic, brittle and heterogeneous nature of CMCs result in different material removal mechanisms which lead to unique surface defects. Hence, this review paper attempts to provide an informative literature survey of the research done in the field of conventional and non-conventional machining of CMCs with a main focus on critically evaluate how different machining techniques affect the machined surfaces. This is achieved by exploring and recollecting the different material characterisation techniques currently used to observe and quantify the mechanical and thermal surface and subsurface damages and highlight their governing removal mechanisms.

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“…The chemical vapor infiltration (CVI) process is one of the routes used for the manufacturing of ceramic-matrix composites [1,2], among which SiC-matrix composites [3,4], ultra-high temperature ceramics (UHTCs) [5], and especially carbon-fiber-reinforced carbon (C f /C) composites [6,7]. This process, a variation of chemical vapor deposition (CVD) [8], has the advantage of producing high-quality matrices without damaging to the fibers, thus allowing a nearly optimal performance of the constituents in the composite [9,10].…”

Section: Introductionmentioning

confidence: 99%

Chemical Supercritical Fluid Infiltration of Pyrocarbon with Thermal Gradients: Deposition Kinetics and Multiphysics Modeling

et al. 2022

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The chemical supercritical fluid infiltration process is a recent variation of the chemical vapor infiltration (CVI) process that allows rapid and efficient manufacturing of ceramic-matrix composites (CMCs), albeit still needing optimization. This article proposes a quantitative assessment of the process dynamics through experiments and modeling. The kinetics of carbon deposition were determined through two sets of experiments: CVD on a single filament at pressures between 10 and 50 bar and infiltration at pressures ranging between 50 and 120 bar. The CVI experiments were conducted under important thermal gradients and were interpreted using a model-based reconstitution of these gradients. We found that (i) the kinetic law has to incorporate the potential effect of the reverse reaction (i.e., etching of C by H2); (ii) the activation energy and pre-exponential factor both decrease with pressure up to 50 bar, then remain roughly constant, and (iii) although the apparent activation energy is modest, a favorable situation occurs in which an infiltration front builds up and travels from the hottest to the coldest part of the preform due to the presence of sufficient heat flux. A numerical simulation of the process, based on the solution of momentum, heat, and mass balance equations, fed with appropriate laws for the effective transfer properties of the porous medium and their evolution with infiltration progress, was performed and validated by comparing the simulated and actual infiltration profiles.

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Carbon/Carbons and their Industrial Applications

Cited by 10 publications

References 98 publications

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

How is it possible to get optimal infiltration fronts during chemical vapor infiltration with thermal gradients ?

The new challenges of machining Ceramic Matrix Composites (CMCs): Review of surface integrity

Chemical Supercritical Fluid Infiltration of Pyrocarbon with Thermal Gradients: Deposition Kinetics and Multiphysics Modeling

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