Thermal Qualification of the UHTCMCs Produced Using RF-CVI Technique with VMK Facility at DLR

Ultra high-temperature ceramic matrix composites (UHTCMCs) based on carbon fibre (Cf) have been shown to offer excellent temperature stability exceeding 2000 °C in highly corrosive environments, which are prime requirements for various aerospace applications. In C3Harme, a recent European Union-fund...

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Veröffentlicht in:Journal of composites science 2022-01, Vol.6 (1), p.24
Hauptverfasser: Venkatachalam, Vinothini, Blem, Sergej, Gülhan, Ali, Binner, Jon
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Blem, Sergej
Gülhan, Ali
Binner, Jon
description Ultra high-temperature ceramic matrix composites (UHTCMCs) based on carbon fibre (Cf) have been shown to offer excellent temperature stability exceeding 2000 °C in highly corrosive environments, which are prime requirements for various aerospace applications. In C3Harme, a recent European Union-funded Horizon 2020 project, an experimental campaign has been carried out to assess and screen a range of UHTCMC materials for near-zero ablation rocket nozzle and thermal protection systems. Samples with ZrB2-impregnated pyrolytic carbon matrices and 2.5D woven continuous carbon fibre preforms, produced by slurry impregnation and radio frequency aided chemical vapour infiltration (RF-CVI), were tested using the vertical free jet facility at DLR, Cologne using solid propellants. When compared to standard CVI, RFCVI accelerates pyrolytic carbon densification, resulting in a much shorter manufacturing time. The samples survived the initial thermal shock and subsequent surface temperatures of >2000 °C with a minimal ablation rate. Post-test characterisation revealed a correlation between surface temperature and an accelerated catalytic activity, which lead to an understanding of the crucial role of preserving the bulk of the sample.
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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute
subjects Ablation
Aviation
Carbon
Carbon fibers
Catalytic activity
Ceramic fibers
Ceramic matrix composites
Continuous fibers
Densification
Fiber preforms
Free jets
High temperature
Plasma sintering
Rocket nozzles
Solid propellants
Spectrum analysis
Surface temperature
Thermal protection
Thermal shock
title Thermal Qualification of the UHTCMCs Produced Using RF-CVI Technique with VMK Facility at DLR
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