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 |
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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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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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