Influence of Thermal Fiber Pretreatment on Microstructure and Mechanical Properties of C/C‐SiC with Thermoplastic Polymer‐Derived Matrices

Reichert, Florian; Langhof, Nico; Krenkel, Walter

doi:10.1002/adem.201500193

Cited by 25 publications

(10 citation statements)

References 32 publications

(63 reference statements)

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“…In the case of powder fillers, the easiest developed approach is to blend graphite with less reactive carbons or with inert powders such as SiC or ZrB 2 . For fibrous reinforcements, the main strategy is to coat fibers with protective interphases by liquid or vapor techniques . Although effective, these procedures are time consuming and expensive when applied to different geometries.…”

Section: Introductionmentioning

confidence: 99%

Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing

et al. 2018

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In this work, we investigated a procedure which exploits microwave ovens to produce SiC-based components by reactive melt infiltration of silicon into graphite preforms. The employed oven is designed to grant optical access to the sample surface, which allows to measure its temperature evolution though a noncontact pyrometer. This signal was used as a feedback to control the power provided to the preform and as an experimental output whose analysis provides insight into the reaction mechanism. Specifically, it is found that complete infiltration is achieved much before the end of the reaction. The latter is not fully self-sustained as the global reaction rate continuously decreases with time until it is no more able to keep the temperature above the silicon solidification value. At that point, the reaction stops. The analysis of the processed samples proved that this procedure allows producing fully infiltrated samples without material failure by adjusting the heat provided during the infiltration stage rather than by tuning the preform structure and composition, which is the usual approach. The proposed method is less time and energy consuming than the standard one.

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Section: Introductionmentioning

confidence: 99%

Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing

et al. 2018

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“…Thus, SiC plays an important role in improving the oxidation and ablation resistance of C/C composites. Furthermore, the introduction of SiC can significantly improve the mechanical properties of C/C composites …”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Ablation Mechanism of C/C and C/C‐SiC Composites Under a Hypersonic Flowing Propane Torch

Jin

Jiang

Wang³

2017

Adv Eng Mater

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The high-velocity oxygen fuel thermal spray system can provide a hypersonic flowing environment in which the temperature, pressure, and speed are all sufficiently high to represent a more realistic environment of hypersonic vehicles than that produced by traditional oxyacetylene flame. In this work, the ablation resistance of C/C and C/C-SiC composites under hypersonic flowing propane flame is investigated, and the microstructure evolution during the ablation process is examined. It is found that different ablation regions are formed depending on the size, and the distributions of temperature and pressure on the front surface of the samples. With the increase of ablation time, a dense and continuous oxide layer forms, which acts as a barrier to prevent the interaction of oxidizing gases and composites, and can also block the conducted heat and resist high temperature scouring of hypersonic flowing flame. In addition, a numerical analysis is performed using ANSYS Fluent software to investigate the fields of velocity, pressure, and temperature on the front surface and around the carbon fibers of the sample. The simulation results further demonstrate the evolution of microstructures of C/C and C/C-SiC composites.

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“…The degree of crystallinity I c was calculated according to Equation

I_{normalc} = \frac{Σ I_{normalc}}{Σ (I_{normalc} + I_{normala})}

in which I c and I a are the integrated intensities of crystalline reflexes and amorphous reflexes, respectively. The phase composition of the C/C‐SiC was identified through silicon uptake and by XRD measurements as described elsewhere . Powdered C/C‐SiC composites were measured in a glass capillary (diameter 0.5 mm) at a scanning rate of 0.2° min −1 and a 2θ range of 20° to 80°.…”

Section: Methodsmentioning

confidence: 99%

“…In view of their prolonged curing cycles, however, alternative polymeric matrices such as pitch, poly(ether ether ketone) (PEEK) or poly(ethyleneimine) (PEI) have been used, too. These polymers also allow for high carbon yields after carbonization . Generally, the polymeric matrix does not only influence carbon yields but is also essential for the fiber‐matrix bonding in the CFRP since it influences the microstructure of the CFRP and, after carbonization, of the resulting carbon–carbon (C/C) preform.…”

Section: Introductionmentioning

confidence: 99%

Preparation of C/C‐SiC Composites from All‐Cellulose Precursors

Schneck

Müller

Hermanutz

et al. 2019

Macro Materials & Eng

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All‐cellulose composites (ACCs) are manufactured from high‐performance cellulose fibers and a cellulose‐containing ionic liquid (IL) as matrix‐forming dope via wet‐winding processes, using different concentrations of cellulose in the IL. ACCs are carbonized at 1650 °C and then infiltrated with liquid silicon. Application of a carbonization aid (ammonium dihydrogenphosphate, ADHP) substantially improves the carbon yield after carbonization but also results in the depletion of the mechanical properties of the final carbon/carbon silicon carbide (C/C‐SiC) material. The microstructure of the porous carbon/carbon preforms strongly depends on both the concentration of cellulose in the IL and the concentration of ADHP. A C/C‐SiC composite manufactured from 6 wt% cellulose in the matrix‐forming dope, in the absence of ADHP, has a maximum flexural strength of 60 MPa. New C/C‐SiC composites with different shapes including Z‐profiles and tubes are successfully manufactured from pre‐shaped ACC precursors. These composites keep their shape during carbonization and the final siliconization process step.

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Influence of Thermal Fiber Pretreatment on Microstructure and Mechanical Properties of C/C‐SiC with Thermoplastic Polymer‐Derived Matrices

Cited by 25 publications

References 32 publications

Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing

Microwave heating controlled reactive melt infiltration for graphite‐Si‐SiC ceramics manufacturing

Microstructure Evolution and Ablation Mechanism of C/C and C/C‐SiC Composites Under a Hypersonic Flowing Propane Torch

Preparation of C/C‐SiC Composites from All‐Cellulose Precursors

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